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ID 26013
file
title alternative
Functional Differentiation of Thermoregulation, Particular Referenecs to Seasonal Variation of Whole Boby Sweat Rate of Exercising Man
creator
Torii, Masafumi
Sasaki, Takashi
Nakayama, Hideaki
subject
Seasonal and natural acclimatization
Warm and cold seasons
Temperature regulation
Thermal response
Moderate exercise
NDC
Medical sciences
abstract
We investigated the seasonal variation of sweating response during exercise. Four adult heaithy men repeated a moderate bicycle exercise (60 watts) in a climatic chamber of an ambient temperature of 30瀉 (relative humidity, 45%) in winter, spring, summer, and fall. In summer, sweat rate immediately increased as soon as the exercise started, whereas in winter in a few minutes. The mean sweat rate during exercise was significantly different between winter and summer. The transient reduction of the T_SK was observed at the beginning of the exercise in winter. The T_SK decreased in proportion to increasing of sweat rate in each season. Significantly negative correlation were found between sweat rate and the rate of change of T_SK during exercise in each season. The slope and intercept of regression line were significantly different between winter and summer. The index of sweating was made available for the relative value, changing rate against annual mean value of total sweat loss (ΔSR, %). The relative value rather than the absolute value (i.e., expressed as g・m^<-2>・h^<-1>) corrected well with skin temperature. It is suggested that the present results may reflect adapted changes in the thermoregulatory mechanisms to seasonal acclimatization. Moreover, the fall in skin temperature during exercise may be not due to increased evaporative cooling, but may be the result of vasoconstriction porbably caused by non-thermal factors.
journal title
The Annals of physiological anthropology : 生理人類学研究会会誌
volume
Volume 10
issue
Issue 3
start page
163
end page
170
date of issued
1991-07-01
publisher
日本生理人類学会
issn
0287-8429
ncid
language
jpn
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
日本生理人類学会
本文データは学協会の許諾に基づきCiNiiから複製したものである
relation url
department
Graduate School of Integrated Arts and Sciences