RELATIONSHIP BETWEEN OXYGEN UPTAKE AND OXYGEN SUPPLY SYSTEM DURING INCREMENTAL-LOAD SUPINE EXERCISE
Journal Title: Biology of Sport - Year 2011, Vol 28, Issue 2
Abstract
The purpose of this study was to determine the relationship between oxygen uptake ( •VO2) and the oxygen supply system during incremental load in the supine position. Each subject (n=6) performed an incremental-load supine exercise test (20 W min-1). •VO2 and heart rate (HR) were measured breath-by-breath during exercise. Oxygenation level was obtained from the inactive biceps brachii muscle using near-infrared spectroscopy (NIRS). •VO2 and HR increased linearly in proportion to increase in work rate (WR) after a time delay. The linear relationships between •VO2 and WR and between HR and WR below the ventilatory threshold (VT, 112.9±11.7 W) were extrapolated to WR above the VT. Estimated HR was not significantly different from that measured above VT. Oxygenation level slightly decreased after the VT and decreased exponentially after the respiratory compensation point (RCP, 175.8±21.3 W). Oxygenation level decreased from 100% at warming-up exercise (10 W) to 63.3±14.0% at exhaustion. In this study, HR and oxygenation level were regarded as oxygen supply to the whole body in the supine position and oxygen supply to inactive muscle, respectively. Therefore, an increase in HR suggests a linear increase in oxygen supply to active muscle through exercise. In addition to the effect of HR, a decrease in oxygenation level in inactive muscle could induce an increase in oxygen supply to active muscle. However, •VO2 showed a linear increase throughout the exercise in the supine position. Judging from the present indirect indicators of HR and oxygenation level, it is unlikely that •VO2 kinetics is determined by oxygen supply to active muscle in the supine position.
Authors and Affiliations
T Arimitsu, R Matsuura, C Lian
Keywords
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