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Effects of gravity on the circadian period in ratsThe effect of increased gravity force on the circadian period of body temperature and activity of rats was investigated using rats implanted with a small radio telemetry device and, after a 2-week recovery and a 3-week control period at 1G, rotated at for 4 weeks at a constant 2G field in a 18-ft-diam centrifuge. Measurements of the mean freerunning period of the temperature and activity rhythms after 10 days showed that the exposure to 2G led to a functional separation of the pacemakers that regulate the activity and the temperature in the animals. Each pacemaker reacted differently: the activity period increased and the temperature period decreased. By the third or the fourth week, the activity and the temperature periods have returned to 1G control levels.
Document ID
19920056552
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Murakami, Dean M.
(NASA Headquarters Washington, DC United States)
Demaria, Victor H.
(NASA Headquarters Washington, DC United States)
Fuller, Charles A.
(California, University Davis, United States)
Date Acquired
August 15, 2013
Publication Date
February 1, 1991
Publication Information
Publication: Physiologist, Supplement
Volume: 34
Issue: 1 Fe
ISSN: 0031-9376
Subject Category
Life Sciences (General)
Accession Number
92A39176
Funding Number(s)
CONTRACT_GRANT: NAGW-2195
Distribution Limits
Public
Copyright
Other

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