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Fluid and protein shifts after postural changes in humansThe effects of head-up, one-step, slow-graded, and rapid-graded tilt positions on blood density (BD), plasma density (PD), and erythrocyte density (ED) in male and female subjects are evaluated using a mass density detection method. The preparation of the samples and procedures for density and hematocrit measurements are described. The formula for calculating the density and volume of fluid shifted between intravascular and extravascular compartments is derived. The data reveal that ED does not change with varying tilt positions; however, PD and BD increase linearly with increasing angles of tilt, thereby resembling the time course of hemodilution and hemoconcentration.
Document ID
19860064785
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hinghofer-Szalkay, H.
(Graz, Universitaet Austria)
Moser, M.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1986
Publication Information
Publication: American Journal of Physiology: Heart and Circulatory Physiology
Volume: 19
ISSN: 0363-6135
Subject Category
Aerospace Medicine
Accession Number
86A49523
Funding Number(s)
PROJECT: FFWF PROJECT 4200
Distribution Limits
Public
Copyright
Other

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