HEAT ACCLIMATIZATION LOWERS CORE TEMPERATURE
Buono, M. J., Heaney, J. H., Leichliter, S. G., & Vurbeff, G. K. (1997). Acclimation to humid heat reduces resting core temperature but not heat storage. Medicine and Science in Sports and Exercise, 29(5), Supplement abstract 560.
Heat-adapted athletes were shown to be cooler at the end of hot humid exercise largely because they start cooler. The lower terminal temperature is not due to a reduction in heat storage.
Implication. Slight drops in resting core temperature could be used as an index of the heat adaptation response when training in the heat.
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