Document Detail

Comparison of heat dissipation response between Malaysian and Japanese males during exercise in humid heat stress.
MedLine Citation:
PMID:  20949285     Owner:  NLM     Status:  MEDLINE    
This study investigated the differences in heat dissipation response to intense heat stress during exercise in hot and humid environments between tropical and temperate indigenes with matched physical characteristics. Ten Japanese (JP) and ten Malaysian (MY) males participated in this study. Subjects performed exercise for 60 min at 55% peak oxygen uptake in 32°C air with 70% relative humidity, followed by 30 min recovery. The increase in rectal temperature (T(re)) was smaller in MY during exercise compared to JP. The local sweat rate and total body mass loss were similar in both groups. Both skin blood flow and mean skin temperature was lower in MY compared to JP. A significantly greater increase in hand skin temperature was observed in MY during exercise, which is attributable to heat loss due to the greater surface area to mass ratio and large number of arteriovenous anastomoses. Also, the smaller increase in T(re) in MY may be explained by the presence of a significantly greater core-skin temperature gradient in MY than JP. The thermal gradient is also a major factor in increasing the convective heat transfer from core to skin as well as skin blood flow. It is concluded that the greater core-skin temperature gradient observed in MY is responsible for the smaller increase in T(re).
Hitoshi Wakabayashi; Titis Wijayanto; Joo-Young Lee; Nobuko Hashiguchi; Mohamed Saat; Yutaka Tochihara
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-10-15
Journal Detail:
Title:  International journal of biometeorology     Volume:  55     ISSN:  1432-1254     ISO Abbreviation:  Int J Biometeorol     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-07-11     Completed Date:  2011-11-21     Revised Date:  2012-03-27    
Medline Journal Info:
Nlm Unique ID:  0374716     Medline TA:  Int J Biometeorol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  509-17     Citation Subset:  IM    
Department of Ergonomics, Faculty of Design, Kyushu University, Minami-ku, Fukuoka, Japan.
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MeSH Terms
Acclimatization / physiology
Asian Continental Ancestry Group
Body Temperature Regulation / physiology*
Exercise / physiology
Heat-Shock Response / physiology*
Hot Temperature / adverse effects
Humidity / adverse effects
Skin / blood supply
Skin Temperature / physiology
Sweating / physiology
Tropical Climate / adverse effects
Young Adult
Comment In:
Int J Biometeorol. 2012 Mar;56(2):403-4; author reply 405-6   [PMID:  21359620 ]

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