CHAMBER COLD ACCLIMATIZATION IN MAN
ARMY MEDICAL RESEARCH LAB FORT KNOX KY
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Nude subjects were exposed 8 hrs daily for 31 days to a temperature of 11.8 C during March. Other subjects were acclimatized similarly to a temperature of 13.5 C in September. At intervals during the exposures, measurements were made of shivering, 02 consumption, rectal and skin temperatures during a 2 hr cold exposure. Shivering decreased significantly in both groups by the 14th day heat production was unchanged in the winter group, but decreased significantly in the summer group. Basal metabolism rate BMR did not change in either group. Rectal temperature in both groups was unchanged for 10 days, but decreased after the 14th day. On the basis of shivering and rectal temperature changes, it was concluded that man can be artificially acclimatized. Failure of cold-elevated metabolism to decrease in the face of significant decrease in shivering indicates the presence of nonshivering thermogenesis in man.
- Stress Physiology