Abstract
RECENT investigations have shown that adrenocortical hormones significantly influence the mineral composition of thermal sweat in man; moreover, the chloride and sodium contents of sweat are claimed to be useful indices of adrenocortical function (1, 2, 3). Based on such observations, evidence has been given showing that acclimatization to heat is dependent on adrenocortical function (4, 5). The present writers have observed that heavy muscular work causes a significant decrease in the sodium and chloride contents of thermal sweat (6), possibly due to an increased adrenocortical function. This has been regarded as a purposeful reaction tending to conserve the salt reserves of the body during excessive sweating. It seemed to be of considerable interest to observe how far differences in physical fitness are mirrored in the mineral composition of thermal sweat, as might be expected on the basis of the results obtained in the studies on acclimatization to heat (4, 5). For this purpose, samples of thermal swea...
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