Does the hair influence heat extraction from the head during head cooling under heat stress?

Shin, Sora; Park, Joonhee; Lee, Jooyoung

doi:10.2486/indhealth.2015-0005

Cited by 7 publications

(7 citation statements)

References 23 publications

(35 reference statements)

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“…Our findings, unsurprisingly, show that a nude scalp can evaporate far more sweat than one covered in hair (Figure 4a), but at the cost of increased water loss. This is in line with results from human trials, which agree that scalp hair is associated with decreased sweating (9)(10)(11). Interestingly, we see a clear trend in decreased evaporative potential as hair curl increases, which has not been previously demonstrated.…”

Section: Experimental Evidence For Thermoprotective Function Of Human...supporting

confidence: 93%

“…The general consensus in the literature is that scalp hair hinders evaporative cooling (3,(9)(10)(11), which is also supported by our results. Adding context to these findings, our study takes into consideration the effect of solar radiation and shows that the relative disadvantage in evaporative cooling potential is dwarfed by the reduction in solar heat gain associated with hair.…”

Section: Hair and Human Thermoregulation In The Literaturesupporting

confidence: 91%

“…However, the scenario of hair/no hair is not always realistic. Shin et al(11) found that people with shorter hair (5mm) lost heat quicker than those with longer hair 100-130mm). This helps explain the spectrum between a hairy and bald scalp.…”

Section: Introductionmentioning

confidence: 99%

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Human scalp hair as a thermoregulatory adaptation

Lasisi

Smallcombe

Kenney

et al. 2023

Preprint

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Humans are unique among mammals in having a functionally naked body with a hair-covered scalp. Scalp hair is exceptionally variable across populations withinHomo sapiens. Neither the function of human scalp hair nor the consequences of variation in its morphology have been studied within an evolutionary framework. A thermoregulatory role for human scalp hair has been previously suggested. Here, we present experimental evidence on the potential evolutionary function of human scalp hair and variation in its morphology. Using a thermal manikin and human hair wigs at different wind speeds in a temperature and humidity-controlled environment, with and without simulated solar radiation, we collected data on the convective, radiative, and evaporative heat fluxes to and from the scalp in relation to properties of a range of hair morphologies, as well as a naked scalp. We find evidence for a significant reduction in solar radiation influx to the scalp in the presence of hair. Maximal evaporative heat loss potential from the scalp is reduced by the presence of hair, but the amount of sweat required on the scalp to balance the incoming solar heat (i.e. zero heat gain) is reduced in the presence of hair. Particularly, we find that hair that is more tightly curled offers increased protection against heat gain from solar radiation.

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Section: Experimental Evidence For Thermoprotective Function Of Human...supporting

confidence: 93%

Section: Hair and Human Thermoregulation In The Literaturesupporting

confidence: 91%

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Human scalp hair as a thermoregulatory adaptation

Lasisi

Smallcombe

Kenney

et al. 2023

Preprint

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“…In an experimentation of the influence of head hair on heat removal, Shin, Park and Lee (2015) found that the optimal temperature for head cooling under heat stress is 10 °C to relieve physiological heat strain; subjects, however, reported to prefer 15 °C. Heat removal from the normal hair condition, namely 100 mm to 130 mm length and cropped hair with 5 mm length, is not meaningfully different.…”

Section: Hairstyles and Head Coveringsmentioning

confidence: 99%

Environmental ergonomics

2013

Occupational Safety and Hygiene

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Peer review declarationThe publisher (AOSIS) endorses the South African 'National Scholarly Book Publishers Forum Best Practice for Peer Review of Scholarly Books'. The manuscript underwent an evaluation to compare the level of originality with other published works and was subjected to rigorous two-step peer review before publication, with the identities of the reviewers not revealed to the editor(s) or author(s). The reviewers were independent of the publisher, editor(s), and author(s). The publisher shared feedback on the similarity report and the reviewers' inputs with the manuscript's editor(s) or author(s) to improve the manuscript. Where the reviewers recommended revision and improvements, the editor(s) or author(s) responded adequately to such recommendations. The reviewers commented positively on the scholarly merits of the manuscript and recommended that the book be published.v Research justificationThis book focuses on the environmental ergonomics of restaurant kitchens and the challenges related hereto in a semi-tropical city, Durban, from a chef's perspective. It establishes the urgent need for commercial kitchens to be conducive to the wellbeing of kitchen workers, as heat illness is unreported in this industry. This research is relevant from occupational health and safety point of view. It evaluates the indoor environmental quality (IEQ) parameters such as heat, ventilation and humidity, noise and lighting in kitchens, and it is cognisant that with different cuisines, the kitchen loads are different. The goal of occupational safety is health intervention for worker comfort to enhance work performance. The book generates new knowledge regarding the factors affecting the body mass index of kitchen workers, prediction of heat and humidity near cooking stoves, discomfort near ovens, lighting in preparation areas and factors affecting reaction to stove noise. The book implements an exploratory design with multiple-case studies. The manuscript is structured into broad chapters on heat, ventilation and humidity, noise and lighting. Data analysis is an essential component of new knowledge, and a detailed description will promote certain research concepts among scholars to acquire research skills. The themes move from the hospitality industry in general and narrow down to commercial kitchens and specifically aim at students learning and training in culinary skills. The book accordingly scrutinises theory in respect of the relationship between individual differences and contextual components, and it factored these into controlled heat in a work environment and other IEQ parameters. This book advances existing physical conditions, as well as physiological and psychological influences of these parameters in commercial kitchens on worker relief-seeking behaviour adaptations. A ground-breaking new framework that optimises workstation comfort levels of kitchen workers is presented, hence offering insightful environmental contributions to improve commercial kitchen design and awareness among kitchen designers, erg...

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“…However, the scenario of hair/no hair is not always realistic. Shin et al ( 13 ) found that people with shorter hair (5 mm) lost heat quicker than those with longer hair 100 to 130 mm). This helps explain the spectrum between a hairy and bald scalp.…”

mentioning

confidence: 99%

Human scalp hair as a thermoregulatory adaptation

Lasisi

Smallcombe

Kenney

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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Humans are unique among mammals in having a functionally naked body with a hair-covered scalp. Scalp hair is exceptionally variable across populations within Homo sapiens . Neither the function of human scalp hair nor the consequences of variation in its morphology have been studied within an evolutionary framework. A thermoregulatory role for human scalp hair has been previously suggested. Here, we present experimental evidence on the potential evolutionary function of human scalp hair and variation in its morphology. Using a thermal manikin and human hair wigs at different wind speeds in a temperature and humidity-controlled environment, with and without simulated solar radiation, we collected data on the convective, radiative, and evaporative heat fluxes to and from the scalp in relation to properties of a range of hair morphologies, as well as a naked scalp. We find evidence for a significant reduction in solar radiation influx to the scalp in the presence of hair. Maximal evaporative heat loss potential from the scalp is reduced by the presence of hair, but the amount of sweat required on the scalp to balance the incoming solar heat (i.e., zero heat gain) is reduced in the presence of hair. Particularly, we find that hair that is more tightly curled offers increased protection against heat gain from solar radiation.

show abstract

Does the hair influence heat extraction from the head during head cooling under heat stress?

Cited by 7 publications

References 23 publications

Human scalp hair as a thermoregulatory adaptation

Human scalp hair as a thermoregulatory adaptation

Environmental ergonomics

Human scalp hair as a thermoregulatory adaptation

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