EFFECTS OF TEMPERATURE CHANGE ON THE WATER BALANCE IN MAN

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Abstract
The effect of changes in the external temp. on the fluid and electrolyte balance was studied on 6 normal [male] subjects under controlled dietary and environmental conditions. The extrarenal water loss was quite constant during any period of uniform temp. Upon change of the environmental temp., the extrarenal water loss and the skin temp. quickly attained new levels. There was no evidence of slow acclimatization. The renal excretion of Na and Cl appeared to reflect the difference between the intake of these substances and the quantities lost in the sweat. A pronounced and prolonged increase in plasma vol. was found on exposure to heat. On exposure to cold the plasma vol. was reduced and tended to return toward normal within a few days.

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