Fluid and protein shifts after postural changes in humans
Journal Article
·
· Am. J. Physiol.: Heart Circ. Physiol.; (United States)
OSTI ID:7188157
The 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. 30 references.
- Research Organization:
- Graz Universitaet, Austria; NASA, Ames Research Center, Moffett Field, CA
- OSTI ID:
- 7188157
- Journal Information:
- Am. J. Physiol.: Heart Circ. Physiol.; (United States), Journal Name: Am. J. Physiol.: Heart Circ. Physiol.; (United States) Vol. 19; ISSN AJPPD
- Country of Publication:
- United States
- Language:
- English
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