Abstract
IT has been shown1 that during a prolonged stay at altitudes above 15,000 ft. there is an increase in the salivary excretion of sodium and a decrease in that of potassium. In one subject this change in salivary electrolyte composition showed a marked acclimatization effect (Fig. 1). These findings suggested that, on arrival at a high altitude, the level of circulating aldosterone was likely to be greatly reduced, but that there would probably be a tendency for it to return slowly towards normal values with passage of time.
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