Journal of Applied Physiology, Vol 54, Issue 2 491-495, Copyright © 1983 by American Physiological Society
Plasma volume shifts during progressive arm and leg exercise
D. S. Miles, M. N. Sawka, R. M. Glaser and J. S. Petrofsky
Upper and lower body exercise was performed to assess the influence muscle
mass has on plasma volume (PV) shifts. Nine male subjects (mean = 28 yr)
completed a progressive intensity, discontinuous test with an arm crank
(AC) and cycle (CY) ergometer. Power output (PO) levels for the AC were 25,
74, 98, and 133 W. PO levels for the CY were 49, 98, 147, and 263 W. At a
given submaximal oxygen uptake (VO2), PV efflux was significantly greater
for AC compared with CY exercise. When PV efflux was related to the
relative intensity of the exercise (ergometer specific % peak VO2),
responses were nearly identical. Maximal PV efflux was 18% for both AC and
CY exercise. Mean arterial pressure (MAP) was significantly greater for AC
compared with CY exercise for a given VO2. MAP plotted against the relative
intensity of exercise, however, was similar for both AC and CY exercise.
These results suggest that the amount of plasma efflux during exercise is
related to the MAP, which is directly related to the relative intensity of
the exercise.
