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J Appl Physiol 57: 366-370, 1984;
8750-7587/84 $5.00
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Journal of Applied Physiology, Vol 57, Issue 2 366-370, Copyright © 1984 by American Physiological Society

ARTICLES

Central hemodynamics during progressive upper- and lower-body exercise and recovery

D. S. Miles, M. N. Sawka, D. E. Hanpeter, J. E. Foster Jr, B. M. Doerr and M. A. Frey

The purpose of this study was to compare stroke volume (SV) and myocardial contractility responses during and immediately after upper- and lower-body exercise. Nine men (mean 28 yr, 78 kg) completed progressive intensity discontinuous tests on both an arm crank and cycle ergometer. Exercise for each power output (PO) was 7 min with 20-min rest periods interspersed. Impedance cardiography was used to measure cardiac output (Q), SV, and contractility on a beat-by-beat basis during exercise and a 15-s recovery period. Q increased linearly, and total peripheral resistance decreased exponentially with increasing PO levels. During recovery from exercise, the Q and heart rate (HR) values decreased immediately at all PO levels. When the exercise VO2 exceeded 1.0 1 X min-1, SV fell significantly during recovery for both exercise modes. In general, the recovery myocardial contractility indices remained similar to exercise values. It was concluded that immediately after low intensities of exercise, Q decreases because of a fall in HR. After moderate- and high-intensity exercise, Q decreases because of a fall in both HR and SV.


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