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Effect of chronic centrifugation on body composition in the rat.Two groups of adult female rats were chronically centrifuged for 60 days (2.76 G, 4.15 G, controls at 1.00 G). Live weights of centrifugal rats decreased about 20 g (6%) per Delta 1 G above control. This weight loss comprised reductions in both body fat and fat-free body weight (FFBW) as determined by body-composition studies on eight rats per group killed at the end of centrifugation. Of nine components constituting the FFBW, only skeletal muscle, liver, and heart changed significantly in weight. Chemical composition showed reductions (compared with controls) in the fat fraction of most components and increases in the water fraction of liver and gut. Identical measurements were made on the remaining eight rats per group killed 43 days after return to 1 G. Neither centrifuged group had reached the control body-weight level at this time. No statistically significant effect of previous G level was found in any of the body-composition parameters. The possible involvment of physiological regulation was considered.
Document ID
19730028568
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Pitts, G. C.
Bull, L. S.
Oyama, J.
(Virginia, University, Charlottesville, Va.; NASA, Ames Research Center Environmental Biology Div., Moffett Field, Calif., United States)
Date Acquired
August 7, 2013
Publication Date
November 1, 1972
Publication Information
Publication: American Journal of Physiology
Volume: 223
Subject Category
Biosciences
Accession Number
73A13370
Funding Number(s)
CONTRACT_GRANT: NAS2-1554
Distribution Limits
Public
Copyright
Other

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