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

P. H. Gander, Ralph Lydic, H. E. Albers, M. C. Moore-Ede

Research output: Contribution to journalArticle

7 Citations (Scopus)

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 (τB = 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 suprachiasmatic 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.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume17
Issue number5
StatePublished - Jan 1 1985
Externally publishedYes

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Saimiri
Body Temperature
Suprachiasmatic Nucleus
Photoperiod
Temperature
Circadian Clocks

All Science Journal Classification (ASJC) codes

  • Physiology
  • Physiology (medical)

Cite this

Forced internal desynchronization between circadian temperature and activity rhythms in squirrel monkeys. / Gander, P. H.; Lydic, Ralph; Albers, H. E.; Moore-Ede, M. C.

In: American Journal of Physiology - Regulatory Integrative and Comparative Physiology, Vol. 17, No. 5, 01.01.1985.

Research output: Contribution to journalArticle

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