脊髄損傷者のレース用車椅子走行における生理学的応答

概要

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The purpose of this study was to investigate the physiological responses during pushing of a racing-wheelchair. Five subjects with spinal cord injury(T4～L1)participated in two experiments. In the first experiment, the subjects pushed a racing-wheelchair mounted on a roller. Pulmonary ventilation(VE), oxygen uptake(VO_2), heart rate(HR), blood lactate concentration(LA), and rating of perceived exertion(RPE)were measured to examine the physiological responses during submaximal and maximal tests of wheelchair exercise. The mean value of %VO_2max at ventilatory threshold(VT)was 60.7±5.3%. VO_2 increased curvilinearly with speed, and HR increased with speed, forming an S-shape. HR increased linearly with increasing VO_2 before the VT, then showed a steeper parabolic rise to almost maximum, followed by a flat phase. In the second experiment, during 1500-m and 5000-m wheelchair races and a half-marathon, VE, VO_2, and HR were measured to reveal the physiological characteristics of wheelchair racing as a competitive sport. During the 1500-m and 5000-m races by four subjects, the mean values of % VO_2max were 73.1±7.3% and 66.0±13.3%, respectively. During the half-marathon by one subject, %VO_2max reached 72.1%. These data suggest that wheelchair endurance athletes compete at very high intensity(over VT level)in wheelchair races.
1998-02-01