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Masking of the circadian rhythms of heart rate and core temperature by the rest-activity cycle in manExperiments were conducted to estimate the magnitude of the masking effect produced in humans by alternate periods of physical activity and rest or sleep on the circadian rhythms of heart rate and core temperature. The heart rate, rectal temperature, and nondominant wrist activity were monitored in 12 male subjects during 6 days of normal routine at home and during 6 days of controlled bed-rest regimen. The comparisons of averaged waveforms for the activity, heart rate, and temperature indicated that about 45 percent of the range of the circadian heart rate rhythm during normal routine and about 14 percent of the range of the circadian temperature rhythm were attributable to the effects of activity. The smaller effect of activity on the temperature rhythm may be partially attributable to the fact that core temperature is being more rigorously conserved than heart rate, at least during moderate exercise.
Document ID
19870039976
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gander, Philippa H.
(NASA Ames Research Center Moffett Field, CA, United States)
Connell, Linda J.
(NASA Ames Research Center Moffett Field, CA, United States)
Graeber, R. Curtis
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1986
Publication Information
Publication: Journal of Biological Rhythms
Volume: 1
Issue: 2, 19
Subject Category
Aerospace Medicine
Accession Number
87A27250
Distribution Limits
Public
Copyright
Other

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