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Am J Physiol Regul Integr Comp Physiol 280: R1741-R1747, 2001;
0363-6119/01 $5.00
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Vol. 280, Issue 6, R1741-R1747, June 2001

Blood flow and muscle oxygen uptake at the onset and end of moderate and heavy dynamic forearm exercise

Mireille C. P. Van Beekvelt1,2, J. Kevin Shoemaker1, Michael E. Tschakovsky1, Maria T. E. Hopman2, and Richard L. Hughson1

1 Department of Kinesiology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada; and 2 Department of Physiology, University of Nijmegen, 6500 HB Nijmegen, The Netherlands

We hypothesized that forearm blood flow (FBF) during moderate intensity dynamic exercise would meet the demands of the exercise and that postexercise FBF would quickly recover. In contrast, during heavy exercise, FBF would be inadequate causing a marked postexercise hyperemia and sustained increase in muscle oxygen uptake (VO2musc). Six subjects did forearm exercise (1-s contraction/relaxation, 1-s pause) for 5 min at 25 and 75% of peak workload. FBF was determined by Doppler ultrasound, and O2 extraction was estimated from venous blood samples. In moderate exercise, FBF and VO2musc increased within 2 min to steady state. Rapid recovery to baseline suggested adequate O2 supply during moderate exercise. In contrast, FBF was not adequate during heavy dynamic exercise. Immediately postexercise, there was an ~50% increase in FBF. Furthermore, we observed for the first time in the recovery period an increase in VO2musc above end-exercise values. During moderate exercise, O2 supply met requirements, but with heavy forearm exercise, inadequate O2 supply during exercise caused accumulation of a large O2 deficit that was repaid during recovery.

oxygen deficit; oxygen debt; excess postexercise oxygen consumption; Doppler; aerobic metabolism; lactate


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