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Disproportional changes in hematocrit, plasma volume, and proteins during exercise and bed rest.The interrelationships between the changes in plasma volume, hematocrit, and plasma proteins during muscular exercise and bed rest were investigated. Proportionally, the changes in hematocrit are always smaller than the changes in plasma volume. For this reason changes in the concentration of blood constituents can only be quantitated on the basis of plasma volume changes. During short periods of intensive exercise, there was a small loss of plasma proteins. With prolonged submaximal exercise there was a net gain in plasma protein, which contributes to stabilization of the vascular volume. Prolonged bed rest induced hypoproteinemia; this loss of plasma protein probably plays an important role in recumbency hypovolemia.
Document ID
19720052300
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Van Beaumont, W.
(St. Louis University St. Louis, Mo., United States)
Greenleaf, J. E.
Juhos, L.
(NASA Ames Research Center Laboratory of Human Environmental Physiology, Moffett Field, Calif., United States)
Date Acquired
August 6, 2013
Publication Date
July 1, 1972
Publication Information
Publication: Journal of Applied Physiology
Volume: 33
Subject Category
Biosciences
Accession Number
72A35966
Distribution Limits
Public
Copyright
Other

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