Acclimation to humid heat lowers resting core temperature

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 (T...

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Veröffentlicht in:American journal of physiology. Regulatory, integrative and comparative physiology integrative and comparative physiology, 1998-05, Vol.274 (5), p.1295-R1299
Hauptverfasser: Buono, Michael J, Heaney, Jay H, Canine, Katherine M
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container_end_page R1299
container_issue 5
container_start_page 1295
container_title American journal of physiology. Regulatory, integrative and comparative physiology
container_volume 274
creator Buono, Michael J
Heaney, Jay H
Canine, Katherine M
description 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 (T re ) 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 T re significantly ( P  
doi_str_mv 10.1152/ajpregu.1998.274.5.r1295
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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 T re significantly ( P  &lt; 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 T re significantly ( P  &lt; 0.05) decreased from 37.0 ± 0.3 to 36.7 ± 0.4°C. In fact, all nine men showed a decrease in resting T re from day 1  to day 7 , ranging from 0.1 to 0.5°C. In addition, resting T re and ending T re were significantly correlated ( r  = 0.68). However, the mean increases in T re (ending T re minus resting T re ) and heat storage that occurred on each of the 7 acclimation days were not significantly different. 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Regulatory, integrative and comparative physiology</title><addtitle>Am J Physiol</addtitle><description>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 (T re ) 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 T re significantly ( P  &lt; 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 T re significantly ( P  &lt; 0.05) decreased from 37.0 ± 0.3 to 36.7 ± 0.4°C. In fact, all nine men showed a decrease in resting T re from day 1  to day 7 , ranging from 0.1 to 0.5°C. In addition, resting T re and ending T re were significantly correlated ( r  = 0.68). However, the mean increases in T re (ending T re minus resting T re ) and heat storage that occurred on each of the 7 acclimation days were not significantly different. 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Regulatory, integrative and comparative physiology</jtitle><addtitle>Am J Physiol</addtitle><date>1998-05-01</date><risdate>1998</risdate><volume>274</volume><issue>5</issue><spage>1295</spage><epage>R1299</epage><pages>1295-R1299</pages><issn>0363-6119</issn><issn>0002-9513</issn><eissn>1522-1490</eissn><abstract>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 (T re ) 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 T re significantly ( P  &lt; 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 T re significantly ( P  &lt; 0.05) decreased from 37.0 ± 0.3 to 36.7 ± 0.4°C. In fact, all nine men showed a decrease in resting T re from day 1  to day 7 , ranging from 0.1 to 0.5°C. In addition, resting T re and ending T re were significantly correlated ( r  = 0.68). However, the mean increases in T re (ending T re minus resting T re ) and heat storage that occurred on each of the 7 acclimation days were not significantly different. 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source MEDLINE; American Physiological Society Paid; EZB-FREE-00999 freely available EZB journals
subjects Acclimatization - physiology
Adult
Body Temperature Regulation - physiology
Hot Temperature
Humans
Humidity
Male
Time Factors
title Acclimation to humid heat lowers resting core temperature
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