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Forced internal desynchronization between circadian temperature and activity rhythms in squirrel monkeys.

P H Gander·R Lydic·H E Albers·M C Moore-Ede
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Abstract

In an attempt to force internal desynchronization between the rest-activity rhythm and the body temperature rhythm of the squirrel monkey (Saimiri sciureus), five animals were studied in a 14:14 light-dark cycle. In four animals a 28-h spectral component was found to predominate in the rest-activity rhythm, whereas an unentrained circadian component (tau = 25.9 +/- 0.4 h) predominated in the body temperature rhythm. Plots of the cycle-by-cycle acrophases of the two rhythms confirm that they desynchronize, due to the failure of the temperature rhythm to entrain to the light-dark cycle. These data from intact animals provide further support for the hypothesis that the squirrel monkey circadian timing system has at least two pacemakers. A rhythm for which the supra-chiasmatic nuclei (SCN) have previously been shown to be essential (rest-activity) simultaneously exhibited a different period from a rhythm (body temperature) that has been shown to persist after destruction of the SCN.

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AnimalsBody TemperatureCebidaeCircadian RhythmDrinkingEatingHydrocortisoneMelatoninMotor ActivitySaimiriJournal ArticleResearch Support, U.S. Gov't, Non-P.H.S.Research Support, U.S. Gov't, P.H.S.

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P H Gander, R Lydic, H E Albers, M C Moore-Ede. 1985. Forced internal desynchronization between circadian temperature and activity rhythms in squirrel monkeys.. https://doi.org/10.1152/ajpregu.1985.248.5.r567

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