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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 (
O2musc). 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
O2musc 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
O2musc 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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