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Departments of Biology and Exercise and Nutritional Sciences, San Diego State University, San Diego 92182; and Naval Health Research Center, Applied Physiology Division, San Diego, California 92186
The
purpose of this study was to test the hypothesis that a reduction in
resting rectal temperature (Tre)
is partially responsible for the attenuation in the rise of core
temperature during heat exposure following acclimation to humid heat.
Nine male volunteers completed 7 days of acclimation, performing 2 h of
exercise per day in a hot, humid environment (35°C, 75% relative
humidity). Mean (±SD) ending
Tre significantly
(P < 0.05) decreased from 38.9 ± 0.5°C on day
1 to 38.3 ± 0.4°C on
day
7. Likewise, mean (±SD) resting
Tre significantly
(P < 0.05) decreased from 37.0 ± 0.3 to 36.7 ± 0.4°C. In fact, all nine men showed a decrease in
resting Tre from
day 1 to day
7, ranging from 
0.1 to
0.5°C. In addition, resting
Tre and ending
Tre were significantly correlated (r = 0.68). However, the mean
increases in Tre (ending
Tre minus resting
Tre) and heat storage that
occurred on each of the 7 acclimation days were not significantly
different. These results support the hypothesis that a reduction in
resting Tre is partially
responsible for the attenuation in ending
Tre during heat exposure following short-term acclimation to humid heat.
heat storage; high wet-bulb temperature; temperature regulation; resting body temperature
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