Sweat electrolytes in desert walks.

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Abstract
The rate of sweating in desert walks at 80 or 100 m/min. and the concentrations of Na, K, and chloride in sweat were studied in 31 school boys, the same number of school girls, in several men, and in 2 women. Findings indicate that the rate of sweating under such conditions even up to an ambient temperature of 42 C depends on body surface, metabolic rate, and ambient temperature, not on sex nor age. The sweat produced is all evaporated; there is equal water economy irrespective of age and sex. Earlier unpublished findings on concentrations of electrolytes in sweat from the hand and from the body of men and boys are reported. Deductions based on sweat collected from a gloved hand may be invalid. In particular, the concentration of K may be 3 times higher than in sweat from the entire body surface. An individual exhibits a wide range in composition of sweat depending on the internal and external environment. Also there is a wide intraindivldual range in the same external environment and at the same metabolic rate.

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