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Circadian rhythm dissociation in an environment with conflicting temporal informationThe relative contributions of light-dark (LD) cycles and eating-fasting (EF) cycles in providing temporal information to the circadian time-keeping system were examined in chair-acclimatized squirrel monkeys (Saimiri sciureus). The circadian rhythms of drinking, colonic temperature, urine volume, and urinary potassium excretion were measured with the LD and EF cycles providing either conflicting phases or periods. In conflicting phase experiments, animals were exposed to 24-hr LD cycles consisting of 12 hr of 600 lx followed by 12 hr of less than 1 lx and concurrent 24-hr EF cycles in which the animals ate for 3 hr and then fasted for 21 hr. One group had food available at the beginning and a second group at the end of the light period. In conflicting period experiments, monkeys were exposed to 23-hr LD cycles and 24-hr EF cycles. Analysis of the rhythms showed that both phase and period information were conveyed to the drinking and urinary rhythms by the EF cycle, and to the temperature rhythm by the LD cycle.
Document ID
19780068790
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sulzman, F. M.
(Harvard Medical School Boston, MA, United States)
Fuller, C. A.
(Harvard Medical School Boston, MA, United States)
Hiles, L. G.
(Harvard Medical School Boston, MA, United States)
Moore-Ede, M. C.
(Harvard University Boston, Mass., United States)
Date Acquired
August 9, 2013
Publication Date
September 1, 1978
Publication Information
Publication: American Journal of Physiology
Volume: 235
Subject Category
Life Sciences (General)
Accession Number
78A52699
Funding Number(s)
CONTRACT_GRANT: NSF PCM-76-19943
CONTRACT_GRANT: NSG-9054
CONTRACT_GRANT: NIH-GN-22085
Distribution Limits
Public
Copyright
Other

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