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Comparison of synchronization of primate circadian rhythms by light and foodIt is a well-documented fact that cycles of light and dark (LD) are the major entraining agent or 'zeitgeber' for circadian rhythms and that cycles of eating and fasting (EF) are capable of synchronizing a few circadian rhythms in the squirrel monkey. In this paper, by contrasting how these rhythms are timed by LD and EF cycles, the differential coupling to the oscillating system within adult male squirrel monkeys is examined. The variables measured are the rhythms of drinking, colonic temperature, and urinary potassium and water excretion. Attention is given to a comparison of the reproducibility of the averaged waveforms of the rhythms, the stability of the timing of a phase reference point, and the rate of resynchronization of these rhythms following an abrupt 8-hr phase delay in the zeitgeber. It is shown that the colonic temperature rhythm is more tightly controlled by LD than EF cycles, and that the drinking and urinary rhythms are more tightly coupled to EF than LD cycles.
Document ID
19780045731
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sulzman, F. M.
(Harvard Univ. Boston, MA, United States)
Fuller, C. A.
(Harvard Univ. Boston, MA, United States)
Moore-Ede, M. C.
(Harvard University Boston, Mass., United States)
Date Acquired
August 9, 2013
Publication Date
March 1, 1978
Publication Information
Publication: American Journal of Physiology
Volume: 234
Subject Category
Life Sciences (General)
Accession Number
78A29640
Funding Number(s)
CONTRACT_GRANT: NIH-GN-22085
CONTRACT_GRANT: NAS9-14249
CONTRACT_GRANT: NSF PCM-76-19943
Distribution Limits
Public
Copyright
Other

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