Partitional calorimetric studies of responses of man to thermal transients.

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Abstract
Men dressed in shorts were exposed for 1 hr. at 28 C, then quickly transferred to environments of 33, 38, 43, and 48 C for 2 hrs., andfinally transferred to 28 C for 1 hr. Continuous measurements were made of tympanic, rectal, and average skin temperatures, metabolic rate, and weight loss due to evaporation of sweat. Sweating responded to sudden changes in environmental temperature before appreciable changes occurred in either the tympanic or rectal temperatures. During the transient phases and steady states for environments of 33 and 38 C the evaporative heat loss correlated best with the skin temperature. Stimulation of internal receptors alone, as indicated by the tympanic temperature, cannot account for the evaporative heat loss changes observed in these experi- ments. The total evaporative heat loss in these experiments could be considered as roughly the summative actions of the thermal stimulation of the skin and internal receptors with a relative weighting of 1:4.

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