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Evidence for thermoregulatory behavior during self-paced exercise in the heat

The primary objective of this investigation was to test the hypothesis that voluntary reductions in exercise intensity in heat improve heat exchange between the body and the environment, and are thus thermoregulatory behaviors. This was accomplished by observing the conscious selection of exercise i...

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Published in:Journal of thermal biology 2011-10, Vol.36 (7), p.390-396
Main Authors: Schlader, Zachary J., Stannard, Stephen R., Mündel, Toby
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Language:English
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description The primary objective of this investigation was to test the hypothesis that voluntary reductions in exercise intensity in heat improve heat exchange between the body and the environment, and are thus thermoregulatory behaviors. This was accomplished by observing the conscious selection of exercise intensity and the accompanying thermal outcomes of eleven moderately active males when exposed to an uncompensably hot (UNCOMP) and a compensable (COMP) thermal environment. Evidence for thermoregulatory behavior was defined relative to the specific, pre-determined definition. Self-selected exercise intensity (power output) was unanimously reduced in UNCOMP over time and relative to COMP in all the subjects. These voluntary responses were found to modify metabolic heat production over time and therefore heat exchange between the body and the environment. Likewise, the observed reductions in power output were, at least in part, due to a conscious action, that was found to be inversely related to the total body heat storage and thermal discomfort. There was no evidence for thermoregulatory behavior in COMP. These data uniquely indicate that voluntary reductions in exercise intensity improves heat exchange over time, and therefore contributes to the regulation of body temperature. These findings suggest that reductions in exercise intensity in heat are, by definition, thermoregulatory behaviors. ► This study formally evaluated self-paced exercise in heat as a model to investigate the control of human thermoregulatory behavior. ► Reductions in exercise intensity in heat were found to be thermoregulatory behaviors. ► The data presented support the use of self-paced exercise in heat as a model to evaluate thermal behavior in humans.
doi_str_mv 10.1016/j.jtherbio.2011.07.002
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subjects Exercise intensity
Thermal behavior
Thermal compensability
Thermal discomfort
title Evidence for thermoregulatory behavior during self-paced exercise in the heat
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