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The effects on human sleep and circadian rhythms of 17 days of continuous bedrest in the absence of daylightAs part of a larger bedrest study involving various life science experiments, a study was conducted on the effects of 17 days of continuous bedrest and elimination of daylight on circadian rectal temperature rhythms, mood, alertness, and sleep (objective and diary) in eight healthy middle-aged men. Sleep was timed from 2300 to 0700 hours throughout. Three 72-hour measurement blocks were compared: ambulatory prebedrest, early bedrest (days 5-7), and late bedrest (days 15-17). Temperature rhythms showed reduced amplitude and later phases resulting from the bedrest conditions. This was associated with longer nocturnal sleep onset latencies and poorer subjectively rated sleep but with no reliable changes in any of the other sleep parameters. Daily changes in posture and/or exposure to daylight appear to be important determinants of a properly entrained circadian system.
Document ID
20040172826
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Monk, T. H.
(University of Pittsburgh School of Medicine Pennsylvania, United States)
Buysse, D. J.
Billy, B. D.
Kennedy, K. S.
Kupfer, D. J.
Date Acquired
August 22, 2013
Publication Date
October 1, 1997
Publication Information
Publication: Sleep
Volume: 20
Issue: 10
ISSN: 0161-8105
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: K02 MH01235
CONTRACT_GRANT: MH30915
CONTRACT_GRANT: AG13396
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Regulatory Physiology

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