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Journal of Applied Physiology, Vol 47, Issue 5 1031-1038, Copyright © 1979 by American Physiological Society
ARTICLES |
J. E. Greenleaf, V. A. Convertino and G. R. Mangseth
Our purpose was 1) to test the hypothesis that in man there is a range of plasma osmolality within which the red cell volume (RCV) and mean corpuscular volume (MCV) remain essentially constant and 2) to determine the upper limit of this range. During a variety of stresses--submaximal and maximal exercise, heat and altitude exposure, +Gz acceleration, and tilting--changes in plasma osmolality between -1 and +13 mosmol/kg resulted in essentially no change in the regression of percent change in plasma volume (PV) calculated from a change in hematocrit (Hct) on that calculated from a change in Hct + hemoglobin (Hb), i.e., the RCV and MCV were constant. Factors that do not influence RCV are the level of metabolism, heat exposure at rest, and short-term orthostasis (heat-to-foot acceleration). Factors that may influence RCV are exposure to high altitude and long-term orthostasis (head-up tilting). Factors that definitely influence RCV are prior dehydration and extended (greater than 2 h) periods of stress. Thus, either the Hct or the Hct + Hb equations can be used to calculate percent changes in PV under short-term (less than 2 h) periods of stress when the change in plasma osmolality is less than 13 mosmol/kg.
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