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J Appl Physiol 71: 2178-2182, 1991;
8750-7587/91 $5.00
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Journal of Applied Physiology, Vol 71, Issue 6 2178-2182, Copyright © 1991 by American Physiological Society

ARTICLES

Elevated rectal temperature produced by all-night bright light is reversed by melatonin infusion in men

R. J. Strassman, C. R. Qualls, E. J. Lisansky and G. T. Peake
Department of Psychiatry, University of New Mexico School of Medicine, Albuquerque.

Early morning rectal body temperature is lowest when melatonin levels are highest in humans. Although pharmacological doses of melatonin are hypothermic in humans, the relationship between endogenous melatonin and temperature level has not been investigated. We measured rectal body temperature in nine normal men whose melatonin levels were suppressed by all-night sleep deprivation in bright light and compared values with those seen in sleep in the dark, sleep deprivation in dim light (to control for the stimulatory effect of wakefulness on temperature), and sleep deprivation in bright light with an infusion of exogenous melatonin that replicated endogenous levels. Minimum rectal temperature, calculated from smoothed temperature data from 2300 to 0515 h, was greater in bright-light sleep deprivation, resulting in suppression of melatonin, than in conditions of sleep deprivation in dim light or sleep in the dark. An exogenous melatonin infusion in bright light returned the minimum temperature to that seen in dim-light sleep deprivation. A nonsignificant elevation in mean and minimum temperature was noted in all conditions of sleep deprivation relative to sleep. We conclude that melatonin secretion contributes to the lowering of core body temperature seen in the early morning in humans.


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