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August 2, 1947

Current Comment

JAMA. 1947;134(14):1177-1178. doi:10.1001/jama.1947.02880310035012

FATIGUE AND SWEATING  The maintenance of efficiency under conditions of high temperature and humidity is dependent on the ability to maintain the rate of sweating. The factors which control the rate of perspiration have been studied by Gerking and Robinson,1 who caused experimental subjects to do a constant amount of work on a treadmill under controlled conditions of temperature and humidity. If the initial rate of sweating was moderate, 600 to 800 Gm. per hour, it was maintained for a long period. If, however, the initial rate was about 1,400 Gm. per hour, the sweating rate declined from 10 to 80 per cent by the sixth hour of the experiment. The decline in sweating rate was greater in humid than in dry heat and also greater when men wore army tropical uniforms than when they wore only shorts. Water balance was maintained by ingestion of 0.1 per cent sodium

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