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Acclimation to humid heat lowers resting core temperature
M J Buono1, J H Heaney, K M Canine
1Department of Biology, San Diego State University 92182, California, USA.
The American Journal of Physiology
|June 27, 1998
Summary
Heat acclimation lowers resting body temperature, contributing to a reduced rise in core temperature during heat exposure. This finding is crucial for understanding human physiological adaptation to hot environments.
Area of Science:
- Physiology
- Environmental Health
- Exercise Science
Background:
- Acclimation to heat is known to improve thermoregulation.
- The precise mechanisms behind the attenuated core temperature rise post-acclimation require further investigation.
Purpose of the Study:
- To test if a reduced resting rectal temperature (Tre) contributes to the attenuated increase in core body temperature after humid heat acclimation.
Main Methods:
- Nine male volunteers underwent 7 days of humid heat acclimation (35°C, 75% RH) with daily exercise.
- Resting and ending rectal temperatures were measured throughout the acclimation period.
Main Results:
- Resting rectal temperature significantly decreased from day 1 to day 7 (37°C to 36.7°C).
- Ending rectal temperature also significantly decreased post-acclimation (38.9°C to 38.3°C).
- A significant correlation was observed between resting and ending rectal temperatures (r = 0.68).
Conclusions:
- A reduction in resting rectal temperature partially explains the attenuated rise in core temperature observed after short-term humid heat acclimation.
- This physiological adaptation is a key factor in improved heat tolerance.