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Resynchronization of circadian sleep-wake and temperature cycles in the squirrel monkey following phase shifts of the environmental light-dark cycleCircadian rhythms in physiological and behavioral functions gradually resynchronize after phase shifts in environmental time cues. In order to characterize the rate of circadian resynchronization in a diurnal primate model, the temperature, locomotor activity, and polygraphically determined sleep-wake states were monitored in squirrel monkeys before and after 8-h phase shifts of an environmental light-dark cycle of 12 h light and 12 h dark (LD 12:12). For the temperature rhythm, resynchronization took 4 d after phase delay shift and 5 d after phase advance shift; for the rest-activity cycle, resynchronization times were 3 d and 6 d, respectively. The activity acrophase shifted more rapidly than the temperature acrophase early in the post-delay shift interval, but this internal desynchronization between rhythms disappeared during the course of resynchronization. Further study of the early resynchronization process requires emphasis on identifying evoked effects and measuring circadian pacemaker function.
Document ID
19870038680
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wexler, D. B.
(Harvard Univ. Boston, MA, United States)
Moore-Ede, M. C.
(Harvard University Boston, MA, United States)
Date Acquired
August 13, 2013
Publication Date
December 1, 1986
Publication Information
Publication: Aviation, Space, and Environmental Medicine
Volume: 57
ISSN: 0095-6562
Subject Category
Life Sciences (General)
Accession Number
87A25954
Funding Number(s)
CONTRACT_GRANT: AF-AFOSR-78-3560
CONTRACT_GRANT: NSG-9054
Distribution Limits
Public
Copyright
Other

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