American Society for Testing and Materials standard chamber and manikin conditions for testing thermal (Rt\n) and evaporative (Ret\n) resistance.
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Venkateswarlu",coverURL:"https://cdn.intechopen.com/books/images_new/371.jpg",editedByType:"Edited by",editors:[{id:"58592",title:"Dr.",name:"Arun",surname:"Shanker",slug:"arun-shanker",fullName:"Arun Shanker"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"878",title:"Phytochemicals",subtitle:"A Global Perspective of Their Role in Nutrition and Health",isOpenForSubmission:!1,hash:"ec77671f63975ef2d16192897deb6835",slug:"phytochemicals-a-global-perspective-of-their-role-in-nutrition-and-health",bookSignature:"Venketeshwer Rao",coverURL:"https://cdn.intechopen.com/books/images_new/878.jpg",editedByType:"Edited by",editors:[{id:"82663",title:"Dr.",name:"Venketeshwer",surname:"Rao",slug:"venketeshwer-rao",fullName:"Venketeshwer Rao"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"4816",title:"Face Recognition",subtitle:null,isOpenForSubmission:!1,hash:"146063b5359146b7718ea86bad47c8eb",slug:"face_recognition",bookSignature:"Kresimir Delac and Mislav Grgic",coverURL:"https://cdn.intechopen.com/books/images_new/4816.jpg",editedByType:"Edited by",editors:[{id:"528",title:"Dr.",name:"Kresimir",surname:"Delac",slug:"kresimir-delac",fullName:"Kresimir Delac"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}}]},chapter:{item:{type:"chapter",id:"31887",title:"Gender and Entrepreneurship in Uganda: Women Manoeuvring Economic Space",doi:"10.5772/35573",slug:"gender-and-entrepreneurship-in-uganda-women-manoeuvring-economic-space",body:'Despite the vastness and depth of the entrepreneurship literature, there is a gap between women’s experiences of the phenomenon and what explanations traditional research is producing in academic setting. This means that explanations of entrepreneurial experiences remain largely rooted in orthodox perspectives focused on comparisons of male and female entrepreneurs. Yet such an approach does not illuminate how and why entrepreneurship came to be defined and understood in relation to the behavior of only men.
Inadequacies in comprehending the phenomenon of entrepreneurship by the orthodox approaches have led to the criticism that the concept of entrepreneurship is discriminatory (Billig, 1994), gender-biased (Moore, 1990; Stevenson, 1990), ethnocentrically determined, and even in some respects ideologically controlled (Armstrong, 2001; Ogbor, 2000). More specifically, Ogbor (2000) argued that the discourse on entrepreneurship can potentially sustain not only prevailing societal biases, but also serve as a tapestry for unexamined and contradictory assumptions and knowledge about entrepreneurs. Feminist critics have similarly pointed out weaknesses in the ability of the orthodox frameworks in small business and entrepreneurship research to advance theories relevant to women’s experiences. Moreover, despite appeals by researchers (Davidson & Wilklund, 2001; Low & MacMillan, 1988; Shane & Venkataraman, 2000) for alternative approaches, many problem formulations and research themes in the entrepreneurship literature are mainly approached from a particular paradigmatic orientation.
The above arguments suggest that while the research on female entrepreneurship has provided much insight into the behaviours and characteristics of some women business owners, much of the focus has remained on strategies through which female entrepreneurs can mimic the male norm. Such an orientation is guided by an interest in sex-equality, defined as women’s similar access to success in business ownership as men’s. Citing the limitations that have been recognized with these basic approaches to the study of women and gender which initially looked promising, Ahl (2006) argued that they are inadequate for understanding gender and women’s activities. Ahl’s argument was that the women’s own perspectives are lost in these strategies of adding women, not merely by their under-representation in research, but by the fact that whenever they are represented, they are represented in the terms controlled by the dominant groups, rather than their own terms and with their own voice.
Against that background, although women have been included in a number of studies on entrepreneurship in recent years, there has been little focus on challenging traditional definitions of entrepreneurship or in developing new methods to collect information on entrepreneurship. As such, while there has been some reflection on the difference which the sex of the business owner makes, this reflection has not been contextualized within theoretical understandings of the ways in which entrepreneurial work is socially constructed. That is the ways in which entrepreneurial work is situated within gendered processes which form and are formed through relationships between work, organizational structure and the sex of the entrepreneur.
Discussions in the previous section made reference to problems involving culture and gender in relation to the entrepreneurial experiences of entrepreneurs in contexts different from those on which much of the dominant discourses are based. As such the case for linking gender and culture in the analysis of activities of entrepreneurs is a compelling one. That is, it’s pertinent to focus on ongoing and context specific practices and the relationships that are created through them. In this case (with respect to the study on which this chapter is based), what else are Ugandan women and men doing under the mantle of entrepreneurship discourses?
The argument has long been made that gender is culturally determined. Oakley (cited in Mills, 1988), for example, distinguished between sex and gender, arguing that sex refers to basic physiological differences between men and women, while gender refers to culturally specific patterns of behaviour which may be attached to the sexes. In other words, gender refers to a set of assumptions about the nature and character of the biological differences between males and females; assumptions that are manifest in a number of ideas and practices which have a determinant influence upon the identity, social opportunities and life experiences of human actors (Mills, 1988). In respect to entrepreneurship, they are assumptions that have tended to be taken for granted in discourse and praxis (Ogbor, 2000). This has led to calls for a shift in epistemological position to the study of entrepreneurship (Steyaert & Hjorth, 2007; Rindova, Barry & Ketchen, 2009). Along with others in the entrepreneurship literature (e.g. Blake & Hanson, 2005), the work of Bruni, Gherardi, and Poggio (2004a, b) which used feminist theorizing are good examples to this effect. Bruni et al. (2004a, b) argue that gender and entrepreneurship become mutually constituted through gendered practices performed on a daily basis. That is, doing entrepreneurship is also doing gender. Inspired by such approaches to entrepreneurship scholarship, this chapter takes the social constructionist approach to feminist theorizing as appropriate for these purposes. First, all feminist theorizing is premised on the assumption that gender is fundamental in the structuring of society, with women being historically disadvantaged, and it seeks to end this condition. To this end feminist scholars critically analyse social agendas and consider all forms of knowledge (including that of entrepreneurship) as advancing the interest of some and not others (Harding 1991). As such feminist theorizing offers possibilities for critical scholarship which can encourage reflexive theoretical analyses when researching entrepreneurship.
Second, feminist theories are not only about ‘women’s’ issues (i.e., studying women qua women) (Maynard, 2004a). Rather, by using feminist theories as conceptual lenses, a more inclusive social research practice, one that brings in the concerns of others, not just women, who are directly effected by global social and cultural practices and discourses, can be created (Maynard, 2004a, b). In Africa diverse perspectives on feminism can be found in the contemporary literature (Lewis, 2001). Indeed a range of perspectives are encompassed by feminist scholarship in Africa (Arnfred, 2004; Lewis, 2001; Sadiq, 2002). Recurring themes include the divide between continental Africans and those in the diaspora, the diversity in ‘African’ feminisms which includes womanists (Kolawole, 1997), black feminists, African feminists, or post-colonial feminists (Pereira, 2002; Touré, Barry, & Diallo, 2003); and varying forms of engagement with ‘Western’ feminism. However, what is crucial to the question of how women in different socio-cultural and historical locations organize, around what kinds of issues, whether or not they view their activities as feminist, and if so, how they formulate their relations to feminism, is that their struggles have been not only a response to oppressive features of their own societies, but also a fight against the imposition of Western norms (Pereira, 2002).
Those who advance social constructionist ontology argue that a focus on gender relations brings the analyst’s attention not simply to the sex of participants as embodied actors but to the cultural production of their subjectivities and material production of their lives (Ahl, 2006). From these processes emerge power-laden, contested, and ever changing social terrains where diverse interests play out (Calàs, Smircich, Bourne, 2009). In terms of entrepreneurship, as Calàs et al. (2009) suggested, two questions come to the fore: in which ways is entrepreneurship implicated in those gendering processes and practices? What else can be revealed about entrepreneurship through analyses of those processes? Using examples from Uganda, the next sections focus on contextual dynamics in entrepreneurship that are less visible in the extant entrepreneurship literature.
According to the report by the Uganda Bureau of Statistics (2007) on the Uganda Business Register of 2006/2007, informal sector businesses constitute the largest number of businesses in Uganda. This is particularly the case in the trade sector into which over 60% of the national businesses fall. As the report observed, the informal sector has turned out to be very important in terms of employment creation. Despite quantitative measurement of the contributions of female micro-entrepreneurs to the GDP being slow in coming, the trading and services sectors (especially food and beverages, textiles, retail trade, pottery), which have led to the high rate of economic growth in the informal economy (Global Entrepreneurship Monitor [GEM] Uganda 2004 Executive Report), are areas of female dominance.
In Uganda, the history of women’s entry into the business world in some ways parallels, but is distinct from, that of men. As Snyder (2000) noted, the contemporary story of female entrepreneurs in Uganda is also the story of the country’s experience of, and recovery from, civil war and its legacy of death, destruction and fear. In terms of explaining the rise in women’s entrepreneurship, Uganda’s case is unique because “a veritable explosion of Ugandan African entrepreneurship was born out of the need to survive amidst chaos” (Snyder, 2000; p. 17), since the civil wars and economic crises that engulfed the country in the 1970s and early 1980s had such profound demographic and structural impacts.
In Uganda, men and women are connected through kinship relationships that, in turn, are nested in broader structural domains, such as ethnic groups and classes (Ssetuba, 2002; Tadria, 1987; Wakoko & Lobao, 1996). The values and beliefs generated by this system create gender differences in social behaviours, and at the same time reinforce and maintain the status quo in terms of economic and social relations (Tadria, 1987). In Uganda, these distinctions are articulated in proverbs, jokes and myths, and in informal and formal discussions (Ssetuba, 2002). In contrast to other African nations, where gender ideologies stress the role of women as both producers and reproducers (Overa, 2003), in Uganda Tadria (1987) noted that a woman’s worth is measured first in terms of what she can offer to family survival. That is, in terms of procuring and processing food (Tadria, 1987). In addition, childbearing is considered an added advantage in marriage. Following this tradition, and as a result of the fact that a high proportion of women live in rural areas, over time Ugandan women have come to provide 60% of the labour force in the agricultural sector and account for over 80% of the labour force in food production (Snyder, 2000).
According to Bantebya (1992) the analysis of the societal impact of colonialism on women’s economic activities suggests that this system was more detrimental for women than for men. After all, as Tadria (1987) observed, in Uganda men became part of the money economy while the women remained in the traditional sector. More specifically, Tadria (1987) argued that the economy was demarcated into two ideologically-aligned sectors: a local sector dominated by women and characterized by the sale of agricultural produce and other commodities around the homesteads, and the external sector dominated by men (men who migrate from their homes to engage in a variety of cash-generating activities). However, consciousness of discrimination by formal institutions has been on the rise in recent times in Uganda, and women’s recent actions in politics (Goetz 2002; Tamale, 1998; Tripp, 1999, 2001), entrepreneurship (Snyder, 2000) and finance (Guwatudde, 1994) have been acknowledged by scholars. It is even suggested that these actions have created changes in gender ideology and power relationships at both the social-structural, and the household levels (Wakoko & Lobao, 1996).
The economic crisis discussed above embraced the position of many Ugandan women, especially poor and peasant women, and weakened the basis of men’s domination. With the decline of agriculture in the 1970s, which had been dominated by men, women learned to work outside of their homesteads. Thus, the National Resistance Movement’s [NRM’s] ascent to power was critical for entrepreneurship because it provided an encouraging environment that came with stability. In spite of these successes, Ugandan feminists groups complain that their countrywomen still have a long way to go before their efforts can bear any significant fruits. Although the Ugandan government has offered strong leadership in promoting women’s rights - something the feminist groups admit - economic factors and the lack of supporting infrastructure continue to prevent women from achieving gender parity. A look at the recent Uganda Business Register survey sheds more light on this. For instance, in the report on the Uganda Business Inquiry of 2006/2007 the trade sector has the highest value added, namely 735 billion shillings. In addition, most businesses in this sector are in the one to four employees size band. However, although the report revealed that women entrepreneurs are mainly to be found owning the small businesses employing between one and four persons, the report treats and characterizes women workers in the economy as a minority, and explains the differences between men’s and women’s businesses as a result of women owners’ lesser qualifications in terms of human, social and financial capital. This is paradoxical in the sense that women’s progress in business ownership remains virtually invisible while a few demographic differences between men’s and women’s businesses are documented.
Similarly, Snyder (2000) observed that whereas women in Uganda now have the instruments for their political empowerment (enshrined in the 1995 constitution), women’s economic power has not been boosted with similar positive policies and actions. Thus, such features make Uganda a particularly interesting place for research that addresses questions relating to experiences of female entrepreneurs.
In this study, a choice was made to undertake a narrative type of inquiry because of three contributions that such an approach has been observed to make to research studies that emphasize interpretation, rather than prediction. First, it has been observed that narrative inquiry provides an internally consistent research approach when asking questions that relate to meaning and interpretation. Second, narrative inquiry is an appropriate methodology to capture complex interpretations of experience because it captures context and makes space for the multiple representations of various voices with a stake in the research (Dodge, Ospina, & Foldy, 2005). Finally, it taps into the unique kind of knowledge that is communicated through stories.
In order to carry out a narrative form of inquiry, a number of research techniques were used to generate stories about participants’ entrepreneurial experiences. This meant that the researcher listened carefully to how the participants thought about their lives, and critically to how traditional social sciences scholars conceptualized women’s and men’s lives. In terms of specific techniques, the study utilized in-depth interviews and short life-story forms of interviewing.
The sampling strategy followed that of Byrne (2004), broadly described as a purposive approach. That is, the selection of participants was based on information derived from already available sources of data, such as life-history documents relating to some of the participants. These sources were used to identify and locate appropriate participants who would then be approached and asked to participate. In some cases, snowball sampling (Byrne, 2004) was also followed. In the snowball strategy, some of the participants identified potential participants who were then approached by the researcher. As it has been observed in the literature, life-history research typically relies on small sample groups (Plummer, 2001). In this study, this meant that the participant sampling was based on considerations of data quality, rather than on statistical representativeness.
The current study made the following three assumptions that underpin three approaches to narratives discussed in this paper. The first assumption is that the stories of entrepreneurs tell about their experiences in their entrepreneurial activities give us access to the arguments, intentions, and meanings that support entrepreneurship (narrative as language). Secondly, entrepreneurship as practice is a legitimate source of knowledge from which to draw lessons about entrepreneurship, which can then be applied to other contexts (narrative as knowledge). The third assumption is that even though an entrepreneur may actively resist societal structures of power, those structures may influence their work, producing incongruence between discourse and practice (narrative as metaphor).
In analysing and interpreting narratives generated during the research process, three assumptions guided the researcher’s methodological choices and influenced the nature of the analysis that was carried out. Drawing on narrative as language, the researcher used stories about participants’ entrepreneurial experiences as the primary source for exploring entrepreneurship practices. Life-story interviews facilitated the flow of stories and storytelling. Similarly, in order to tap into the wisdom of participants’ tacit knowledge- so important to the narrative as knowledge approach- the researcher’s emphasis was focused on access to the insights embedded in entrepreneurs’ day-to-day practices. Finally, drawing from narrative as metaphor, texts were critiqued and deconstructed, rather than taking them at face value in order to decipher implicit shared meanings of the participants’ narratives of their experiences, and possibly offering alternative interpretations of accepted views in entrepreneurship discourse. Integrating elements from all these approaches, the study combined formal narrative analysis, thematic coding, and deconstruction techniques to analyse the data.
Case stories in the study database fell into three main categories: bigmanship, African woman, and cultural entrepreneurship stories. These are briefly described as follows: bigmanship was a category of stories of a culturally idealized form of masculine character. Such stories came in two forms. In the first form, which was referred to as hegemonic masculinity, entrepreneurs in this category provided stories that were consistent with the idea of a male archetypical entrepreneur. In the second form there were stories that provided a defensive grappling with gender issues. That is, in their accounts, emphasis was on gender neutrality as the criterion of fairness.
Women entrepreneurs’ stories of challenges, perseverance and triumph constituted the second category which is referred to as African woman stories. More specifically, African woman stories came in two forms: gendered identity and manoeuvring space stories. In the gendered identity story category, there is a certain tentativeness regarding the position of men in the female entrepreneurs’ business lives. This is reflected in their views of the current gender order and the accommodations they have to make. Manoeuvring space stories provide narratives of the ways in which gender is created and maintained in entrepreneurship discourse and practice. Cultural entrepreneurship stories provide narratives that tell of the meanings that entrepreneurs attach to, and the strategies for, success they adopt.
Rather than presenting case materials relating to entrepreneurial experiences of all the cases in the study, narratives of selected cases are presented in the next sections based on their potential to articulate issues relating to how female entrepreneurs maneouvre economic space. Therefore a detailed presentation and discussion of “bigmanship”; cultural entrepreneurship as well as gendered identity stories is beyond the scope of this chapter. Interested readers can refer to Kikooma (2007; 2011).
While it’s still largely the case that local gender ideologies shape women’s economic opportunities in Uganda, this section presents two case studies of the extent to which female entrepreneurs maneouvre space within the male economic space. In the third case study entrepreneur’s highlights one female entrepreneur’s effort to initiate a self-help association in order to deal with the hostility that was being directed at her ability to crop-farm successfully in a village with culturally biased negative attitudes towards progressive methods of crop farming.
Robinah’s story of how her company (RORASH Educational Publishers) was established starts with her experiences of working outside of the country with mostly international organizations. The characters in her story are family members, and the importance of family is apparent in her narratives. The success of the company is presented as being entirely dependent on her prior experiences while working with international publishers and the marketing skills acquired earlier. In her story, two characters from her family are mentioned in relation to how RORASH was established. Although their involvement in the process of establishing the company was acknowledged, it was taken for granted. For instance, the role of her brother is referred to only when describing the difficulty she had in communicating with Heinemann.
So Heinemann was looking for someone to represent them in Uganda and my former boss at Oxford University Press who [sic] I had worked with - the Heinemann staff in charge of Africa some years ago in Nigeria - recommended me. That is how the relationship started. I mean it was a long one. We missed each other, phones were not working. Sometimes they would travel to Kampala to come and meet me. I would not know how long the flight [would take?] I wouldn’t know … So trips were made and one of the reasons we missed each other was communication owing at the time. The telecommunication system was very poor. Finally we met. The first obstacle was phones. I would have to make an appointment to talk to him through my brother. So my brother would give him something like one or two days to try and locate me. And when I appear maybe his phone is not working. You know. That sort of thing. So it was like a rat race. I don’t know how to call it. Eventually we met and they appointed me as their agent in Uganda. Sole agent.
Robinah’s story of the creation of RORASH as sole agent shows how the ingredients of entrepreneurship described in ‘epic’ terms (Gabriel, 1998) acquire meaning not in the abstract, but by being framed within the entrepreneurial stories. Unlike other stories, the interweaving between the business and the family in its dimensions of gender are not described in problematic terms. In fact, it is at this point that difficulties emerge that make the apparently gender-neutral epic story reveal its carefully constructed gendered nature. For example, the husband’s involvement in the business at any stage in the creation process, as well as after its establishment, is not made explicit except to mention that through his contacts, they (he and Robinah) were able to convince someone to give them a loan to cover the foreign exchange of 10,000 US dollars that were allocated by government to RORASH when it was being established.
I had to look for the equivalent Uganda shillings to cover the allocation … It was not a liberalized market. So I had to get the match up in Uganda shillings and the equivalent at the time. I think this was seven million shillings. So you can quickly work out the rate at the time. So I used my husband’s connection. My husband used to work with Bank of Uganda before we left the country; and remember foreign exchange was by allocation. So many allocatees become his friends. In other words, there were many business people whose applications were fronted by him. So we wrote to one of the friends to lend us seven million shillings. The friend offered the money interest free with only one condition; that the stock will be warehoused by the lender. So, in so far as I would withdraw certain quantities, sell off, pay off, then I would be allowed to withdraw more. This was not a hindrance on my part. If anything, it was … it helped us cut on costs because warehousing costs would have hindered us.
For the most part, Robinah’s story ‘silenced’ other stories, so to speak. The husband and his role in the business are not visible in the narratives. It is only at some critical junctures that his contribution is made reference to. Moreover, she referred to the character of her husband in unpretentious terms.
I think here, let me talk about my husband. He is a globe-trotter, but he is a shy man and he is not very sociable. For him, he likes sports, exercises. Unlike him, I am social. I like both dancing and parties. But he has had no problem with my activities. He gives me guidance whenever I seek it. Being a banker, he finds this sort of work a bit boring.
Here we see how the narrator’s ‘theory in use’ (Bruni et al. 2004) can give meaning to discursive practices of story-telling situated in a specific spatial setting. Robinah’s framing of her story seems to put emphasis on her part of the story of RORASH, and in so doing lessens the possibility of the husband’s part of the RORASH story being seen as necessary for anyone to understand the ‘success’ story of the company fully. That is why, although the husband’s guidance is acknowledged as useful, it is presented as only given when it is sought for. Yet even the name RORASH (an acronym from the names of the couple - Robinah and Rashid) suggests that the husband is, in fact, central to this business, something which is not apparent in Robinah’s narratives.
From Robinah’s narratives, what is said (but also from what may not have been said of the company’s success story) is here seen as mobilizing, and even legitimating an entrepreneurial figure with an image of a “woman multi-million publisher” as one newspaper once described her business prowess (Kamugasa, 1998, p. 15). Thus, her narratives contribute to the hegemonic entrepreneurship discourse which glorifies an entrepreneurial male figure akin to what in the literature are masculine ideals related to risk-taking, authority, sexuality and paid work (Connell, 1995, 2001).
The work of Weedon (1987) may be instructive in examining the above examples. According to Weedon (1987), a post-structuralist perspective allows an investigator not just to evaluate the material possibilities available to women, but it also gives the investigator a sophisticated account of how discourse steeped in particular ideologies may make choices impossible or contradictory. In the case above, Robinah recognizes herself as an independent, successful business woman, but does not recognize the ways in which such a subject position is constructed and, in the words of Weedon (1987, p. 310), “assumes she is the author of the ideology which constructs her subjectivity”.
For a long time in Uganda the business of driving a public transport vehicle, let alone owning one, was a “man’s thing’. However, it was not to remain so forever. In November 1997 the New Vision newspaper wrote that when Victoria Muwanga decided to venture into the transport business like any other ambitious Ugandan, little did she know that it would be such a big issue. Nine months later, she not only captured the traffic officers’ attention, but also won public acclaim (Rwomusana, 1997). The media described the shock on a passenger’s face on realizing that the driver was a woman
A matatu [minibus] passenger bound for Ntinda from Kampala was deeply impressed with his driver’s safety consciousness. “Drives carefully. Does not screech the brakes,” he commented as he moved forward to congratulate the driver. Astonished, he blurred out, “Are you really a woman?” (Rwomusana, 1997, p. 14).
Driver Victoria is one of the female entrepreneurs in Uganda who tried to find new ways to enhance her livelihood. Although she acknowledged that her job (of driving the matatu [mini bus] - the most common form of transport) had been labelled as a ‘men only’ job in Uganda, she believed that this was changing as her passengers like ‘her driving’.
As Kampala’s first female matatu owner-driver, and probably also first in Uganda, her story compelled Snyder (2000) to include her in the book on “Women in African economies”. Describing her experience in her new job, Victoria said: “You need to see the shock on people’s faces, especially men, who enter my bus unknowingly and later discover a woman behind the wheel. But now they like my driving” (Snyder, 2000, p. 187).
Snyder hailed her for bravery and said that Victoria is unwilling to be sidelined because she is a widow and is determined not to become the burden to her family and community. When some men say that she is a muyaye [1] - her reaction is clear:
I do not care because I know I am not a muyaye; I am just earning an honest living. I have to survive. Women should not fear what people say. It is what you think, how you carry yourself that matters. Nothing is going to stop you from being a woman, a wife, a mother just because you drive a taxi! (Snyder, 2000, pp. 187-188).
Victoria plies the Ntinda-Kampala route, a service that earned her a vocational award from the Rotary Club of Mengo. “This is great. I did not expect such recognition and respect from these young people,” she told the New Vision newspaper. She said the recognition made some members of her family who had been reluctant to accept her new profession, change their minds.
My eldest son who had insisted that his friends would laugh at him is now happy with my achievement. The big girl had encouraged me from the start but had probably not expected such an honour in a short time.
But why was she driving? Born into a polygamous family whose head was a medical assistant, Victoria tried her hand at many things. She dropped out of her secondary school education at senior three level upon her father’s death. With a helping hand from a maternal uncle, she later enrolled for a nursing course in Nsambya, but this hope soon withered for the ambitious young woman when one time she (ad)ventured into a discotheque at night and was suspended together with friends. “Naturally, my uncle was disappointed, but being a forgiving parent that he is, he sent me to Nakawa to study secretarial,” she said in her interview with the New Vision newspaper.
Victoria learnt driving as a young girl while living at her uncle’s place, a man whom she regards highly. “My uncle was a minister and one could bribe his drivers to teach you how to drive. The first vehicle I drove was a Mercedes-Benz,” she revealed. Victoria tried farming and food businesses for a while until a friend suggested buying a taxi. However, when she bought a taxi and gave it to a driver, with a relative to oversee, the two connived to cheat her. “For a whole year I got no money while the vehicle became ramshackled,” she revealed. The hired drivers were using the vehicle to transport goats, matooke [green bananas] and other produce from many hundred miles away. “When I grew tired of all that, I thought that I could surely drive,” she explains. She went to UTODA (Uganda Taxi Operators’ and Drivers’ Association) offices for a driving permit, and after undergoing several tests she was commissioned to drive. “It is best to be your own driver”, she admits. Victoria believes there is no reason not to drive and hiring ‘young boys’, most of whom have never handled a million shillings before. “They can cheat an owner out of a hundred thousand shillings, then think they are very rich, stay at home until the money is gone and then come crawling back,” she explains.
What this case study reveals is that while women, on the one hand, are faced with reduced access to both material and other resources, and are subjected to a large number of oppressing mechanisms legitimized by patriarchal structures (Snyder, 2000), they are far from being passive individuals. On the contrary, Victoria’s case shows that they are reflective and active agents, often with both influence and authority within their daily reality. From her story it is clear that gender struggle is integral to all expressions of gender relations, though it can take various implicit and explicit forms. Victoria grew up struggling with expectations of her as a female with specific roles. For instance, these expectations influenced which profession she was expected to join, courses that she studied at school and what skills she acquired as a young girl growing up in a male-dominated world. Indeed, she studied nursing, then studied with Irish nuns in Nsambya Hospital and later studied a secretarial course; all of which were considered as training for ‘women’s jobs’ (Snyder, 2000). Later, she tried different sorts of businesses, including operating a restaurant, farming, as well as food businesses. These are, again, ‘women’s jobs’. None of these were in transport.
The main message of this case study is in the way it brings to the foreground a discord in the traditional role patterns revealed through her entrepreneurial activities. In addition, the traditional notions of gender identity and relations are brought into question. In her case, for instance, girls would normally not be expected to learn how to ride a bike, let alone drive a vehicle, which would later become a critical skill in her current business life. Her story calls into question traditional notions of masculinity in discourse of entrepreneurship and suggests that men gain advantages from the culturally-dominant ideal of masculinity centred around authority, physical toughness and strength, and paid work (Pilcher & Whelehan, 2004), but that few men actually live up to it as the last paragraph in Victoria’s narratives demonstrates.
Some of the most familiar cultural interfaces in Africa are to be found in work by Munene, Schwartz and Kibanja (2005) who attempted to characterize the social and cultural life in relation to poverty in Uganda. They described a particular focal entrepreneurial individual with social capital in a community development association. They explained how in that case study, a focal individual joined a new community after the Ugandan civil war (during the period 1981-1986) and brought with her new ways of crop-farming. In this particular community members experienced perennial food shortages because the rocky landscape with saline topsoil on which they farmed was infertile. The authors noted that for unknown reasons, the community had never utilized the services of an agricultural extension worker to show them how to overcome this problem. Overtime they had come to believe that it was impossible to get good harvests in their village and they were suspicious of anyone who claimed it could be done.
The community members who had been struggling to survive off their saline soil immediately noticed the new settler’s success. Part of the village thought that the newcomer to their community was a miracle worker who was using supernatural powers to achieve ‘bumper’ crop harvests. The more extreme community members holding this view thought that the newcomer had been excommunicated from her former village because she was a witch “since only a witch could succeed where everyone else was failing” (Munene et al, 2005, p. 89). The settler became the talk of the village and of even neighbouring villages and expressing negative evaluations of her. To deal with the hostility that was being directed at her because of her ability to crop-farm successfully, she decided to train the villagers in what she referred to as environmentally sustainable agriculture. To achieve this objective she initiated a self-help association called Twegombe (let us be ambitious) Development Association through which she could impart her skills. According to her, the people of the village were neither hardworking nor progressive. Baali tebegomba (they had no ambition and no admiration for those who were successful), the new settler said. In time women around the village heard and saw what members of Twegombe were doing and they gradually joined one by one and, according to Munene et al. (2005), the association has become one of the most progressive development associations in the community.
For a study on entrepreneurship in a context such as the one described above, what one can note is that entrepreneurial individuals not only seek to combine various resources, but also combine various social relationships in order to create and generate value in the community. An interesting insight in the case study just described above is the role of the focal entrepreneurial individual in changing community mores and social values through unpaid self-motivated social functions, as well as through the exchange of information on villager behaviour and through financial incentives. Moreover, she saw that in order for her to do well, she needed to ensure that the village did well, too.
Recently, there have been calls to entrepreneurship as a more complex phenomenon than is allowed by its narrow formulation as an economic activity (Calàs, Smircich & Bourne, 2009). They question whether the economic emphasis behind entrepreneurship constructs in that traditional perspectives, as well the constructs themselves, represent appropriately all the may constitute the domain of entrepreneurship, including its nature as phenomena. The forms and practices of entrepreneurship presented in this chapter allow us to include other discourses such as cultural and civic discourses besides the economic one. The first two case studies provides us with insight into how individual men and women in the study context perform gender in daily interaction. This was similar to a study by Gherardi (1996), who showed that there was a discursive limitation to what subject positions were available for professional women in male working environments. As the two studies show, the women remain as outsiders. These studies do not only simplify explanations for women’s subordination to what individual men and women did or how they were but also accounted for the choices available through the discursive order. Even when studying individuals “the social” was accounted for.
The social dimension focuses on the social process that constitutes entrepreneurship. The third case study example shifts the focal point from singular entrepreneurs to the everyday processes where multiple actors and stakeholders are made visible as related to entrepreneurship. As Steyaert and Katz (2004) observed, by relating entrepreneurship to society, we become aware of the scenes, aspects and stakeholders we have privileged taking part in entrepreneurial processes and draw attention to other possibilities to tell stories of entrepreneurship.
Whereas the contributions of this study relate to the broadening of entrepreneurship knowledge in general, case materials presented and conceptual lenses applied to analyze them help inform general theory and explain conditions that deviate from traditional theoretical explanations of the phenomenon. The descriptions and discussions in this study highlight a contrasting process, namely examining how entrepreneurs in the case studies presented were practising entrepreneurship and gender in forms that can be considered alternative (if not opposite) to those normally prescribed by a model of hegemonic masculinity.
It has been acknowledged that an account of the processes that position people as ‘men’ and ‘women’ within business practices and as entrepreneurs within gendered practices is an approach still underutilized in the literature (Bruni et al., 2004). In this regard, the use of gender and cultural interfaces as conceptual tools with which to examine entrepreneurship, as both an economic phenomenon, as well as a social practice among historically situated men and women entrepreneurs in Uganda can be seen as a first step towards rethinking female entrepreneurship discourse in this particular context.
Mitigating hot and cold injuries is a complex problem and has been shown to have significant links to a number of individualized factors, to include race, gender, job specialty, and geographic origin [1, 2]. There are many other individualized elements (e.g., fitness, body composition, and genetics) that are intuitively linked to these health outcomes; however, there is a lack of adequate data to scale that sufficiently addresses these issues.
\nThe history of characterizing heat exchange and thermoregulatory functions in humans can be traced back to the late 1770s; where British military physiologist, Sir Charles Blagden conducted descriptive studies of man, dog, and beef steak responses in a hot room [3]. Mathematically describing heat exchange theory has roots in physics and with the development of the laws of thermodynamics and heat exchange, specifically as described in Fourier’s law [4] a mathematical expression of the dynamics of heat balance in solids, simplified as:
\nwhere \n
Key work by Pennes in 1948 [5], reported measured temperatures of tissue and blood at the forearm and enabled the creation of the bioheat transfer equation. This equation has proven to be a key underlying basis of future models, seen as:
\nwhere k (w/m °C) is the tissue thermal conductivity, T is tissue temperature in °C, \n
Conceptually, heat exchange between the human and the environment was first described by Lefevre in 1911; where he characterized the human as a sphere with an internal core that exchanged heat through the shell into the environment [6]. In 1934, Burton applied Fourier’s law, presenting this exchange mathematically and describing the human as one uniform cylinder in what is considered by many as the first visual conceptualization of human thermoregulatory modeling [7].
\nRepresentation of the human in a thermoregulatory model is most often done by sectioning the human into nodes, segments, and elements; typically using one of four different designs, (1) one-node, (2) two-node, (3) multi-node, or (4) multi-element [8]. An example of the difference between these designs is shown in Figure 1; while the multi-element approach is more realistic human shape (e.g., finite analysis distribution). Typically each node represents an independent layer with unique thermal properties, each segment represents a section or grouped section of an area of the body, and each element represents multiple thermal components that make up the whole body (often more geometrically accurate to the shape of the human).
\nExample of model designs.
One node models are essentially empirically derived and do not include elements within the thermoregulatory response system. There are several one node thermoregulatory models that have been used extensively over time to predict core body temperature and thermal discomfort within a given environment [9, 10, 11, 12].
\nSimple two-node models describe specific thermodynamic responses of a single segment, typically separated into concentric core and shell nodes. They have often been used examine thermal discomfort and physiological responses, to include the work by Gagge and Nishi [13, 14, 15], and several others [16, 17, 18, 19]. Two node model approaches have been used where the two node design was applied to multi-segments [20, 21, 22, 23]. Multi-node models are essentially expanded versions of the two-node methods with additional shells or layers within them where the heat balance is calculated for each layer. Multi-node models, with both single- and multi-segment designs have become the more prevalent approach. The first multi-node model was developed by Crosbie et al. [24] and has been followed by many since [25, 26, 27, 28, 29]. Notable is the work of Solwijk and Hardy [30, 31, 32, 33], where they first introduced the concepts of temperature set points and negative feedback in a controlled theory design. Their work has been built upon by many researchers over time [34, 35, 36, 37, 38, 39, 40, 41, 42]. The first multi-element model was originally published in 1961 by Wissler, and later improved upon [43, 44, 45]. Additional multi-element models include work by Smith [46], with the first three-dimensional (3D) transient multi-element model. As computation methods improved, a series of improvements has led to more realistic and complex models [8, 47, 48, 49, 50].
\nWhile the majority of these models were developed with the intent of characterizing thermoregulation in various environments; several have been designed specifically to address cold environments or thermoregulatory events that specifically address cold issues (e.g., finger, hand, foot temperatures). With the intricacies of human response to cold, studies have focused on extremities, the specific areas most subject to cold injuries. One of the first attempts was by Molnar in 1957, used a heat balance approach to study hand temperature responses to cold [51]. This work was followed by work focused on finger freezing points [52, 53, 54, 55, 56, 57] and whole hand modeling [58, 59]. Specific models have also been developed of the foot [60], toes [61], and facial tissues [62, 63]. Cold survival models have been developed over time to make predictions in both open air and submerged environments [64, 65, 66, 67, 68].
\nCharacterizing cold related injuries is fairly complex, as the responses to cold have higher individual variability when compared to heat related injuries. From a clinical perspective, cold related injuries can be broadly divided into three categories: frostbite, nonfreezing cold injuries, and hypothermia. In addition, each of these has varying levels of severity and subcategories associated to them.
\nFrostbite is below the point at which skin tissue begins to freeze. While 0°C (32°F) is traditionally considered the freezing point of water, the freezing point of skin is understood to be marginally lower due to electrolytes [69]. Observed freezing points range from as low as −4.8°C to as high as −0.6°C [69, 70].
\nNonfreezing cold injuries include an array of injury events where tissue freezing has not occurred but damage occurs. The level of severity of nonfreezing injuries is determined by the temperature, duration, and wetness of the exposure to the tissue. Four of the more common specific types of nonfreezing injuries include immersion (trench) foot, chilblain, cold urticaria, and cold-induced bronchoconstriction [71].
\nImmersion foot is a nonfreezing injury. The foot presents swollen, the skin is red initially but as severity increases the skin becomes lower in oxygen saturation and becomes cyanotic (purple, bluish discoloration) [69, 71]. Immersion foot is most often reported after tissue have been exposed for extended periods of time to non-freezing temperatures, between 0 and 15°C (32–60°F) [71]. The term ‘immersion’ itself refers to when the foot is actually immersed in water when the foot is wet within boots for sustained periods of time [69, 71].
\nChilblain is a fairly common nonfreezing injury to the skin. It can occur during 1–5 hours of temperatures below 16°C (60°F) [69]. Cold urticaria is expressed as a quick onset of redness, swelling and itchiness of the skin in response to short-term exposure (i.e., minutes) to cold environments [71]. Cold-induced bronchoconstriction is a physiological response where an individual’s airways are narrowed during exercise in cold environments [69, 71, 72, 73].
\nHypothermia is a broad category of cold injury and is clinically described to be the point at which core body temperature has dropped below 35°C (95°F) [74]. However, hypothermia is more specifically defined with four levels of severity; where normothermia (normal temperature level) is approximately 37°C (98.6°F), mild hypothermia is between 91.4–95°C (33–35°F), moderate hypothermia being 85.2–89.6°C (29–32°F), and severe hypothermia being 56.7–82.4°C (13.7–28°F) [69, 71]. Figure 2 outlines specific core temperature reference points associated with physiological responses using work by Castellani et al. [69] and Pozos and Danzl [74] and described in Army Guidance [75].
\nThe range of human core temperatures and associated physiological responses [76].
The human body is capable of maintaining thermal balance while operating within a wide range of temperatures. The human system generally maintains an internal core temperature (Tc) of approximately 37°C. Due to natural circadian rhythm, Tc fluctuates ~0.5°C daily. However, Tc can fluctuate based on physical activity or environmental conditions, and may range from 36.0–40.0°C. The microenvironment created between human skin and clothing typically must remain within 28–30°C to maintain thermal homeostasis at rest [45]. This microenvironment changes significantly with physical activity due to metabolic heat production and air movement.
\nHumans have an internal control system, primarily the preoptic area of the anterior hypothalamus, responsible for maintaining healthy body temperature. The hypothalamus uses feedback from two main sources, the skin and the blood. When temperature changes (hot or cold) are identified by either of these two sources, impulses are sent to the hypothalamus which in turn directs physiological changes to compensate for these temperatures. To protect from cold or heat injury, the human body attempts to either generate or dissipate heat to stay warm or cool off. Heat production is a natural process for humans and is a function of metabolism, oxidation of foods, and muscular activity. Heat transfer between the human and environment occurs via four pathways: conduction, convection, radiation, and evaporation. This heat exchange process is typically referred to as heat or thermal energy balance, and can be described in the heat balance equation:
\nwhere S is heat storage; M is metabolic rate; W is work rate; R is radiation; C is convection; K is conduction; and E is evaporation. Radiation is heat that is transferred via electromagnetic waves (e.g., solar radiation). Conduction is heat transfer due to the body’s direct contact with a solid object (e.g., touching a cold surface). Convection is heat transfer between the body and a fluid such as air or water. Evaporation is heat loss to the environment due to the phase change from liquid to vapor, typically associated with evaporation of sweat and respiratory water.
\nHyperthermia is when heat gain exceeds heat loss; while hypothermia occurs when body temperature drops below normal levels as heat production is inadequate to compensate for the rate of heat loss to the environment [77].
\nVasoconstriction and vasodilation are the two key physiological responses of how heat transfer is regulated from the body to the periphery [78, 79]. Vasoconstriction is the constriction of blood vessels and occurs in response to cold environments to reduce the amount of blood flow to the skin. Vasoconstriction protects the internal organs from cold exposure but increases cold injury risk in the extremities due to lower blood flow and lower skin temperatures. Vasoconstriction in effect creates a two-layer distribution of body temperature; a cold outer shell surrounding a warmer core. The colder outer shell reduces heat loss to the environment by reducing the temperature gradient between the skin surface and the environment, and a colder surface radiates less heat.
\nVasodilation is essentially the opposite of vasoconstriction; where blood vessels open to allow increased blood flow across the body and out to the extremities to enable increased heat dissipation [78, 79]. During these responses, there are other associated physiological responses that help compensate for the increased skin blood flow (e.g., increased heart rate and cardiac output).
\nThe extremities are more affected by cold exposure than other parts of the body. When the human body cools, blood flow is reduced to the extremities (i.e., the hands and feet) decreasing the amount of warm blood flowing to these areas. It is a challenge to protect the hands and feet as they have lower metabolic heat production of the hands and feet due to their inherently small muscle mass and large surface area to mass ratio.
\nFrom a functional perspective, the balance of control within the human system depends on the response to cold exposure and interaction between peripheral (skin) and core body temperatures with the central nervous system (CNS) and the various physiological responses (Figure 3); [74].
\nPeripheral (skin) and core temperature influence on central nervous system (CNS) and physiological outcomes.
Clothing has long been used to provide protection from environmental elements (heat, cold, etc.) or physical or biological hazards (e.g., rocks, thorns). Clothing properties and requirements vary widely among users and use cases. A single clothing ensemble cannot protect an individual from the extremes of the temperature spectrum of earth, being approximately −89°C at its coldest and 58°C at its warmest. However, clothing is a toll to protect each end of this spectrum of environmental extremes [80]. However, protections must be based on use cases to achieve the desired thermal comfort. For example, protective equipment for American football players (i.e., pads and helmet) is vastly different than protective equipment worn by soldiers (i.e., body armor, ballistic helmet). It should be noted that added protection may increase the thermal burden to wearers, and thus increases risk of heat injuries [81, 82, 83].
\nIt is critical to understand the clothing option tradespace in order to predict and prepare for the impact clothing has on protecting or impairing human health. That is to say, the selection of the proper clothing, requires an understanding of how the human (physiology, anthropology, etc.), the anticipated activities (i.e., work rate, length of exposure and metabolic heat production), the work environments (temperature, humidity, etc.), and the biophysical properties of clothing worn (heat transfer performance) will interact in each workplace scenario.
\nClothing protects the wearer from environmental threats, but may impose a level of thermal burden. Both the biophysical resistances (thermal and evaporative) and spectrophotometric (reflectance, absorptivity, and transmittance) properties of clothing can have a significant influence on the impact of the environment on the wearer. Measurements of the biophysical properties of clothing can be used to model the impacts on thermal sensation (e.g., thermal comfort) and thermoregulatory responses (e.g., heat strain, cold protection). The thermal and evaporative resistances, wind effects, and spectrophotometric properties of the clothing are critical measurements for this purpose.
\nSweating thermal manikins have long been used to provide biophysical measures of clothing and equipment worn by the human [84]. While direct biophysical comparisons can be helpful, i.e., comparing one ensemble’s value to another [85], a more informative approach is to combine these measured values with thermoregulatory modeling. Models enable the prediction of thermoregulatory responses based on different individuals, as well as varied environments, clothing, or activity levels.
\nThe current standard for thermal manikin testing calls for two fundamental measures: thermal resistance (Rt\n) [86] and evaporative resistance (Ret\n) [87]. These two measures represent the dry heat exchange (Rt\n: convection, conduction, and radiation) and wet heat exchange (Ret\n: evaporation). After converting both Rt\n and Ret\n into units of clo and im [88, 89], a ratio can be used to describe an ensemble’s evaporative potential (im/clo) [90].
\nEach ensemble should be tested using chamber conditions from the American Society for Testing and Materials (ASTM) standards for assessing Rt\n (ASTM F1291-16) and Ret\n (ASTM F2370-16) [86, 87] (Table 1).
\nVariable (unit) | \nSkin/surface temperature (Ts\n, °C) | \nAmbient temperature (Ta\n, °C) | \nRelative humidity (RH, %) | \nWind velocity (V, ms−1) | \nSaturation (%) | \n
---|---|---|---|---|---|
\nRt\n (m2 K/W) | \n35 | \n20 | \n50 | \n0.4 | \n0 | \n
\nRet\n (m2 Pa/W) | \n35 | \n35 | \n40 | \n0.4 | \n100 | \n
American Society for Testing and Materials standard chamber and manikin conditions for testing thermal (Rt\n) and evaporative (Ret\n) resistance.
Thermal resistance (Rt\n) is the dry heat transfer from the surface of the manikin through the clothing and into the environment, mainly from convection, and described as:
\nwhere Ts is surface temperature and Ta is the air temperature, both in °C or °K. Q is power input (W) to maintain the surface (skin) temperature (Ts) of the manikin at a given set point; A is the surface area of the measurement in m2. These measures of Rt\n can then be converted to units of clo:
\nwhere IT is the total insulation including boundary air layers. Evaporative resistance (Ret) is heat loss from the body in isothermal conditions (Ts ≈ Ta), described as:
\nwhere Psat is vapor pressure in Pascal at the surface of the manikin (assumed to be fully saturated), and Pa is ambient vapor pressure, in Pascal, of the chamber environment. Measures of Ret can then be converted to a vapor permeability index (im), a non-dimensional measure of water vapor resistance of materials defined as:
\nIn order to use the biophysical measures, i.e., measures of Rt\n (clo) and Ret\n (im) for thermoregulatory modeling there is a need to first estimate the effects of wind velocity on the biophysical characteristics of the ensemble (i.e., to determine how wind affects clo and im values). These effects are typically referred to as wind velocity coefficients or gamma values (g) [91]. Historically, these coefficients were determined by collecting measurements of both Rt\n and Ret\n at multiple wind velocities above the ASTM standard of 0.4 m/s. However, recent work suggests these coefficient values can be accurately estimated from single wind velocity tests [91, 92].
\nClothing properties and wind coefficients are critical inputs to a number of predictive mathematical models [10, 11, 93, 94], as they use these values to describe wind-related effects, such as intrinsic insulation (Icl\n) and intrinsic permeability index (icl\n) for either the whole body or segments of the body, as seen with:
\nwhere Ia\n is insulation measured on a nude thermal manikin, It\n is total insulation, and (fcl\n) is clothing area factor, calculated by:
\nwhere A (m2) is surface area of the nude manikin, and Acl\n (m2) is surface area the clothed manikin.
\nTrue measures of Acl\n require a three-dimensional scan. However, methods for estimating Acl\n have been derived by McCullough et al. [95]. Simplified or estimated Acl\n and fcl\n is often used where a value of 1 is assumed for warm-weather or indoor clothing. For cold-weather clothing a value would be calculated from:
\nWhile these estimation methods have been studied and produce acceptable variance between estimated and direct measured results [96], there are questions whether estimates remain acceptable for clothing insulation outside typical cold weather clothing insulation ranges, e.g., 0.2–1.7 clo [97].
\nMost clothing-based thermal models, by design, predict human thermoregulatory responses to various environmental conditions and therefore require quantitative insights into the change in clothing properties with changes in wind velocity. Furthermore, elements of wind can significantly influence physiological responses and injury outcomes in cold environments due to wind chill effects [69, 98, 99]. There has been work to develop that relates exposure time to predicted injury (e.g., frostbite) likely to occur due to temperature and levels of wind speed exposure [98].
\nMathematical models can predict the human thermal response (e.g., metabolic heat production, core body temperature (Tc\n), endurance time) resulting from activity, environment, and clothing. These mathematical models are typically binned into one of three categories, either as rational, empirical, or hybrid. Rational (mechanistic) models mathematically represent phenomena based on an understanding of physics and physiology (biology, chemistry, physics). Empirical models mathematically reflect the observed relationship among experimental data. While both methods, rational and empirical, are scientifically valid approaches, perhaps the most effective approach is the hybrid or mixed model method that uses a combination of the two.
\nRational modeling incorporates equations that describe heat balance and thermoregulatory processes [100]. Two fundamental equations are used to describe internal heat balance and for heat exchange between skin and environment. One equation outlines the temperature gradient change from core to skin and can be seen as:
\nwhere \n
The second equation describes heat exchange from the skin surface to the environment as:
\nwhere λ is the tissue heat conductivity (W m−1 °C−1), T is tissue temperature (°C), \n
Rational models of thermoregulatory processes usually include equations for the controlling signals of the thermoregulation system and equations for thermoregulatory actions such as sweating, vasodilation, vasoconstriction, and shivering.
\nUnderstanding the interplay between each of the different layers of the human (grossly consisting of core, muscle, fat, and skin) along with clothing and air layers within clothing is only the first step to modeling the human’s response in a given environment. Figure 4 shows the rational basis behind the SCENARIO model where the human is mathematically represented as one multi-layer cylinder, based on the relationship of the layers of the human, their respective physiological responses, and clothing [93, 94].
\nFundamental rational basis (SCENARIO model) [93], reused with permission. Note: BFcr\n is core blood flow, BFmu\n is muscle blood flow, BFfat\n is muscle blood flow, BFsk\n is skin blood flow.
Empirical models are mathematical representations of data, often using statistical methods such as regression or correlational analysis. An example model is the Heat Strain Decision Aid (HSDA), empirically derived by the U.S. Army from an extensive database of human studies that incorporates the biophysics of heat exchange [10, 11, 101] and predicts core temperature, maximum work times, sustainable work-rest cycles, water requirements, and the estimated likelihood of heat casualties. This model has been used to derive guidance and doctrine for military [102] and fluid intake guidance for the public [103]. The basis of HSDA includes both principles of heat exchange along with empirical predictions of physiological responses. Collectively 16 inputs from four elements (individual characteristics, physical activity, clothing biophysics, and environmental conditions) are used to mathematically predict the rise in core body temperature during physical activity [10].
\nOriginally developed by Holmér [104], a simple calculation was adopted by the International Organization Standardization (ISO) technical report (ISO 11079) [105], as an evaluation metric of the insulation required (IREQ) for given environments and activities to compare ensemble performance. The IREQ method functionally describes the concept for balancing the heat exchange between the human and the environment, and simplified as:
\nwhere M is metabolic heat produced, W is effective mechanical work and collectively M-W represents the heat produced within the human; while the opposite side of this balance, Eres\n and Cres\n represent the respiratory heat exchange (evaporative and convective), and E, K, R, and C represent the conventional heat exchange methods (evaporative, conductive, radiative, and convective) and S is heat storage.
\nThe IREQ equation illustrates the rational balance between thermal insulation and heat transfer, seen as:
\nor more formally as:
\nwhere tsk\n is mean skin temperature, tcl\n clothing surface temperature, and \n
This method also determines the minimum and neutral IREQ (IREQmin and IREQneutral), and describes amounts of insulation needed to maintain thermal balance (minimum) and to maintain an equilibrium balance (neutral). The ISO 11079 also outlines general scenarios for the minimum required insulation (IREQmin) for multiple work intensities and environments. Collectively this method provides a simple method for evaluating the effectiveness of specific cold weather clothing at protecting from cold injuries [106].
\nWhen developing a cold-based thermal model there are a number of physiological, environmental, and biophysical parameters that can and should be considered. Particular attention should be paid to the extremity temperatures blood flow and metabolic heat production.
\nAs blood flow is a major component to the overall movement of heat, it is important to be able to predict blood flow to the muscle, skin, and distribution of blood flow to these regions within the body. Table 2 outlines some historical methods used in models for predicting each of these elements.
\nPrediction | \nEquation | \nUnits | \nReferences | \n
---|---|---|---|
Cutaneous blood flow (\n | \n\n\n | \nmL 100 mL tissue−1 min−1\n | \n[79, 107, 108, 109, 110, 111, 112, 113, 114, 115] | \n
Skin vasodilation (dilat) | \n\n\n | \nL h−1\n | \n[33] | \n
Skin vasoconstriction (stric) | \n\n\n | \nL h−1\n | \n[33] | \n
Skin blood flow (\n | \n\n\n | \nmL min−1\n | \n[116] | \n
Local blood flow (\n | \n\n\n | \nL h−1\n | \n[33] | \n
Muscle blood flow (\n | \n\n\n | \nL h−1\n | \n[33] | \n
Muscle blood flow (\n | \n\n\n | \nmL min−1\n | \n[116] | \n
Methods for predicting skin blood flow in thermoregulatory models.
Note: qs\n and qs,r\n are skin blood flow and rate; AVD is active vasodilation; CVC is cutaneous vascular conductance—addition of M (mediated), L (locally), and E (effect of exercise); \n
Shivering is where, in response to cold exposure, muscles involuntarily contract rhythmically off and on in an attempt to increase body temperature [74]. During cold exposure the shivering response is a critical element to model, as the production of heat protects the body core temperature despite skin to the ambient heat loss. Table 3 outlines some of the modeling approaches that have been used to predict the shivering response as they relate to the total metabolic rate (M) and the heat production from shivering (Mshiv\n).
\nPrediction | \nEquation | \nUnits | \nReferences | \n
---|---|---|---|
Total shivering (TOTMshiv) | \n\n\n | \nkcal h−1\n | \n[37] | \n
Maximal shivering (Shivmax) | \n\n\n | \nmLO2 kg−1 min−1\n | \n[37] | \n
Metabolic rate of shivering (Mshiv) | \n\n\n | \nkcal h−1\n | \n[30] | \n
Metabolic rate of shivering (Mshiv) | \n\n\n | \nkcal h−1\n | \n[117] | \n
Metabolic rate to open air (M1) | \n\n\n | \nW m−2\n | \n[118] | \n
Total metabolic rate (M2) | \n\n\n | \nW m−2\n | \n[118] | \n
Total metabolic rate (M) | \n\n\n | \nW kg−1\n | \n[119] | \n
Metabolic rate of shivering (Mshiv) | \n\n\n | \nW m−2\n | \n[120] | \n
Methods for predicting shivering related model calculations.
Note: T is temperature; \nh\n is head; set is set point of temperatures; Wa,m\n is a weighting coefficient; qs\n is heat flux \ns\n is skin; BMI is body mass index; \nty\n is Tympanic membrane; \nre\n is rectal; and \nes\n is esophageal; BF% is body fat percentage.
An individual’s metabolic heat production can be estimated at rest and during activity using the assumed basal rate of 58.2 W/m2 [121] and the estimated metabolic equivalents (METS) of activity; where 1 MET is resting. Ainsworth et al. [122] outlines a wide range of activities and their associated MET level for reference. However, there are metabolic rate estimation methods available based on energy costs of standing or walking (Table 4). Recently work has also been published that makes corrections to some of these prediction methods specific to traveling over snow terrain [123].
\nPrediction | \nEquation | \nUnits | \nReferences | \n
---|---|---|---|
Metabolic rate | \n=1.44 + 1.94·S\n0.43 + 0.24·S\n4\n | \nW kg−1\n | \n[124] | \n
=3.5 + 6·S + 1.08·S·G\n | \nmLO2 kg−1 min−1\n | \n[125] | \n|
=17.7–18.138·S + 9.72·S\n2\n | \nmLO2 kg−1 min−1\n | \n[126] | \n|
=1.4 + 0.42·G + 3.68·S − 0.01·M − 0.03·Age | \nW kg−1\n | \n[127] | \n|
=1.5·M + 2·(M + L)·(L·M\n−1)2 + η(M + L)(1.5·S\n2 + 0.35·S·G) | \nW | \n[128] | \n|
=Ht·(0.0136·Ht − 0.375)−1·(1.92·S\n0.176–1.445) ·Wt·105·(0.82·S\n2–3.94·S + 9.66) | \nl O2 min−1\n | \n[129] | \n
Methods for predicting metabolic rates during walking or standing.
Mathematical models and decision aids are tools for inspiring advancements within the field of thermophysiology, and for providing solutions to help mitigate injury risk.
\nScientifically based models have been used in the development of public [97, 98, 103, 104, 130, 131, 132] and military guidance [75, 131, 133], for forensic assessments [134, 135, 136, 137, 138, 139, 140], as well in the creation of operational tools for survival [141, 142]. Notably, the use of Xu and Werner’s six cylinder model [41] was used to develop the Probability of Survival Decision Aid (PSDA), a computer model used to predict hypothermia and dehydration impact on functional time (i.e., duration of ability for useful work), and survival time while exposed to marine environments [67, 143, 144]. The PSDA model is underpinned by the rational principles described herein and the outputs are provided in a customized graphical user interface. This tool has been transitioned for use by Search and Rescue (SaR) personnel and continues to be refined and verified based on real-world feedback and data collected [144].
\nThere is a need for continued advancement in the development of individualized modeling methods such as finite element models as well as providing models and decision aids that can be used in dynamic settings and for complex scenarios with prolonged durations. Additionally, inclusion of probabilistic and statistically based risk factors should be used as elements that help improve individualized predictions. The accessibility of the information from these tools continues to be a challenge for the scientific community. While providing usable information to the public, military, and other user communities should be the ultimate goal of these work efforts; feedback from these communities should be translated back to the scientists to ensure relevant improvements are made from real-world information.
\nThis work is dedicated to the memory of Dr. Eugene H. Wissler (1927–2018). His pioneering efforts modeling heat transfer in the human body provided critical ground work that continues to be emulated by researchers.
\nThe authors would also like to thank Dr. Scott Montain for oversight and review of this chapter.
\nThe authors have no conflicts of interest to declare. Funding for this work has been provided by U.S. Army Medical Research and Materiel Command (USAMRMC), Military Operational Medicine Research Program (MOMRP).
The views expressed in this paper are those of the authors and do not reflect the official policy of the Department of Army, Department of Defense, or the US Government.
\nAuthors are listed below with their open access chapters linked via author name:
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\n\n\n\n\n\n\n\n\n\nJocelyn Chanussot (chapter to be published soon...)
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