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Related Experiment Videos

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

P H Gander, R Lydic, H E Albers

    The American Journal of Physiology
    |May 1, 1985
    PubMed
    Summary

    Squirrel monkeys exposed to a 14:14 light-dark cycle showed internal desynchronization between rest-activity and body temperature rhythms. This suggests distinct pacemakers control these circadian processes in the squirrel monkey (Saimiri sciureus).

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    Area of Science:

    • Chronobiology
    • Primate Physiology
    • Circadian Rhythms

    Background:

    • The circadian timing system regulates physiological rhythms.
    • Squirrel monkeys (Saimiri sciureus) exhibit distinct rest-activity and body temperature rhythms.
    • The supra-chiasmatic nuclei (SCN) are crucial for synchronizing many circadian rhythms.

    Purpose of the Study:

    • To investigate internal desynchronization between rest-activity and body temperature rhythms in squirrel monkeys.
    • To test the hypothesis of multiple pacemakers within the squirrel monkey circadian timing system.
    • To examine the entrainment of these rhythms to an artificial light-dark cycle.

    Main Methods:

    • Five squirrel monkeys were housed in a 14:14 light-dark cycle.
    • Rest-activity and body temperature rhythms were monitored.

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  • Spectral analysis and acrophase plotting were used to analyze rhythmicity and synchronization.

    • Main Results:

    • A 28-hour spectral component dominated the rest-activity rhythm in four animals.
    • An unentrained circadian component (tau = 25.9 ± 0.4 h) predominated in the body temperature rhythm.
    • Cycle-by-cycle acrophase plots confirmed desynchronization between the two rhythms.

    Conclusions:

    • The body temperature rhythm failed to entrain to the light-dark cycle, leading to desynchronization.
    • These findings support the hypothesis that the squirrel monkey circadian timing system involves at least two distinct pacemakers.
    • A rhythm dependent on the SCN (rest-activity) exhibited a different period than a rhythm persisting after SCN destruction (body temperature).