Journal of Applied Physiology
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J Appl Physiol 43: 421-424, 1977;
8750-7587/77 $5.00
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Journal of Applied Physiology, Vol 43, Issue 3 421-424, Copyright © 1977 by American Physiological Society

ARTICLES

Renin, aldosterone, electrolyte, and cortisol responses to hypoxic decompression

J. R. Sutton, G. W. Viol, G. W. Gray, M. McFadden and P. M. Keane

Responses of plasma renin activity, plasma aldosterone, plasma cortisol, and plasma electrolyte concentration and urinary electrolyte and aldosterone excretion were studied in four men during hypoxic decompression to a stimulated altitude of 4,760 m in a pressure chamber. Three of the four subjects developed significant acute mountain sickness. Plasma sodium and potassium concentrations were unchanged. No significant change in plasma renin activity was observed, but values tended to fall. Plasma aldosterone concentration was depressed while plasma cortisol was elevated and diurnal variation lost. Urinary sodium excretion was unchanged, but urinary potassium and aldosterone excretion were decreased. The decrease in plasma and urinary aldosterone and urinary potassium in the absence of change in plasma renin activity or plasma potassium is of uncertain origin. It is unlikely to be due to a decrease in adrenocorticotropin secretion since plasma cortisol rose during the same time. None of the changes could be causally implicated in the development of acute mountain sickness although the increase in plasma cortisol was greatest in the most ill.


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