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Science 17 February 1978:
Vol. 199. no. 4330, pp. 794 - 796
DOI: 10.1126/science.414356
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Articles

Science, Vol 199, Issue 4330, 794-796
Copyright © 1978 by American Association for the Advancement of Science

articles

Thermoregulation is impaired in an environment without circadian time cues

CA Fuller, FM Sulzman, and MC Moore-Ede

Squirrel monkeys synchronized to a 24-hour light-dark cycle show a prominent circadian rhythm in body temperature which is regulated against mild environmental cold exposures throughout the 24-hour day. However, cold exposures produce significant decreases in core body temperature when the circadian rhythms of the animal are free-running in the absence of environmental time cues. Effective thermoregulation appears to require the precise internal synchronization of the circadian timekeeping system.


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