EXERCISE-INDUCED CHANGES IN BLOOD, RED-CELL, AND PLASMA VOLUMES IN MAN

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  • 1 January 1977
    • journal article
    • research article
    • Vol. 9  (3) , 155-158
Abstract
Changes in blood (BV), red cell (RCV) and plasma (PV) volumes were computed from Hb and hematocrit values during submaximal treadmill exercise at 5 work intensities (30, 45, 60, 75 and 90% .ovrhdot.VO2 max [maximal O2 uptake]) in 5 male subjects. RCV remained constant under all conditions. Changes in BV (hemoconcentration) could be accounted for entirely by decreases in PV at all work levels. PV was a linear function of work intensity from rest through 60% .ovrhdot.VO2 max. A break occurred at that point in the data. Modeling of this break was accomplished by the use of 1 model (the Fold catastrophe) taken from the generalized catastrophe theory. Several limitations to the acceptance of the model are presented, including the need to demonstrate a hysteresis in PV occuring at about 65% .ovrhdot.VO2 max.

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