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Circadian rhythm asynchrony in man during hypokinesis.Posture and exercise were investigated as synchronizers of certain physiologic rhythms in eight healthy male subjects in a defined environment. Four subjects exercised during bed rest. Body temperature (BT), heart rate, plasma thyroid hormone, and plasma steroid data were obtained from the subjects for a 6-day ambulatory equilibration period before bed rest, 56 days of bed rest, and a 10-day recovery period after bed rest. The results indicate that the mechanism regulating the circadian rhythmicity of the cardiovascular system is rigorously controlled and independent of the endocrine system, while the BT rhythm is more closely aligned to the endocrine system.
Document ID
Document Type
Reprint (Version printed in journal)
Winget, C. M.
Vernikos-Danellis, J.
Cronin, S. E.
Leach, C. S.
Rambaut, P. C.
Mack, P. B.
(NASA Ames Research Center Environmental Biology Div., Moffett Field, Calif.; NASA, Manned Spacecraft Center, Preventive Medici, United States)
Date Acquired
August 7, 2013
Publication Date
November 1, 1972
Publication Information
Publication: Journal of Applied Physiology
Volume: 33
Subject Category
Accession Number
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