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Int J Sports Med 1986; 07(1): 22-25
DOI: 10.1055/s-2008-1025729
© Georg Thieme Verlag Stuttgart · New York

Faster Kinetics of V̇O2 During Arm Exercise with Circulatory Occlusion of the Legs

R. L. Hughson, M. D. Imman
  • Department of Kinesiology, University of Waterloo, Waterloo, Ontario N2L 3GI Canada
Supported by Heart & Stroke Foundation of Ontario and Natural Sciences & Engineering Research Council (Canada)
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Publication Date:
14 March 2008 (online)

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Abstract

Occlusion of the nonworking leg muscles prior to the onset of supine arm exercise was examined for an effect on the kinetics of respiratory gas exchange (V̇O2 and V̇CO2), ventilation (V̇E), and heart rate (HR). Seven subjects performed arm cycling at 40 W (two females) or 50 W (five males) for 8 min following 4 min of “0” W pedaling. Six repetitions of each of uncuffed and cuffed leg conditions were averaged for individual subject analysis. The V̇O2 kinetics were significantly faster in the cuffed than the uncuffed condition (mean response time 66.0 ± 26.4 vs 81.2 ± 37.5 s, P < 0.04). The kinetics of V̇CO2, V̇E, and HR were not affected by occlusion. It is concluded that the faster V̇O2 kinetics with the prior occlusion of nonworking leg muscles was a consequence of increased availability of oxygen to the working arm muscles at the onset of exercise.

Key words

oxygen uptake - exercise - blood flow distribution - oxygen transport

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