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J Appl Physiol 12: 13-16, 1958;
8750-7587/58 $5.00
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Urinary Excretion of Adrenal Steroids During Excercise in Hot Atmospheres

Kathleen W. Robinson 1 and W. V. Macfarlane 1

1 From the Sir William Macgregor School of Physiology, University of Queensland, Brisbane, Australia

The urinary output of 17-ketosteroids and 17-ketogenic steroids has been measured in human subjects exercising in the heat (40.5°C). A decrease of more than 50% occurred in the excretion of both steroid fractions, with moderate exercise. In one subject, exercising to the point of distress, there was an initial decrease then an increase in the excretion of steroids. Urinary sodium excretion decreased rapidly and the K/Na ratio rose during the heating period. The rate of urine flow was not related to the concentration of plasma antidiuretic substance.

Submitted on August 22, 1957






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