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Effects of exercise on fluid exchange and body composition in man during 14-day bed restA description is presented of an investigation in which body composition, fluid intake, and fluid and electrolyte losses were measured in seven normal, healthy men during three 2-wk bed-rest periods, separated by two 3-wk recovery periods. During bed rest the subjects remained in the horizontal position continuously. During the dietary control periods, body mass decreased significantly with all three regimens, including no exercise, isometric exercise, and isotonic excercise. During bed rest, body mass was essentially unchanged with no exercise, but decreased significantly with isotonic and isometric exercise. With one exception, there were no statistically significant changes in body density, lean body mass, or body fat content by the end of each of the three bed-rest periods.
Document ID
19770061868
Document Type
Reprint (Version printed in journal)
Authors
Greenleaf, J. E. (NASA Ames Research Center Moffett Field, CA, United States)
Bernauer, E. M. (NASA Ames Research Center Moffett Field, CA, United States)
Juhos, L. T. (NASA Ames Research Center Moffett Field, CA, United States)
Young, H. L. (NASA Ames Research Center Moffett Field, CA, United States)
Morse, J. T. (NASA Ames Research Center Moffett Field, CA, United States)
Staley, R. W. (NASA Ames Research Center Laboratory of Human Environmental Physiology, Moffett Field; California, University, Davis, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
July 1, 1977
Publication Information
Publication: Journal of Applied Physiology: Respiratory
Subject Category
AEROSPACE MEDICINE
Funding Number(s)
CONTRACT_GRANT: UCD-205
Distribution Limits
Public
Copyright
Other