Effect of oxygen uptake on performance during short-term strenuous exercise

Abstract

The purpose of this study was to investigate the effect of NetVO_2 (excess increase to resting value) on performance during short-term strenous exercise in each sports event, and also the relationship between NetVO_2 and VO_2max by using incremental exercise. Thirty-two trained males (100 m runners: n=6, 400 m runners: n=8, ice hockey players: n=10, long distance sports men: n=8) and six untrained males, aged 23.6 ± 3.1 yrs, performed cycle ergometer exercise,pedaling against 0.1 kp/kg wt with maximal effort for 45s. NetVO_2 in trained groups were significantly higher than that of untrained group. The differences of VO^^._2max between trained groups were significant, except between both groups of 400 m runner and ice hockey player,while there were no significant differences among Net VO_2. Total work and peak power were highest in the groups of 100 m and 400 m runner, whose ratio of Net VO_2 to O_2 requirement were both 14.6%, and this percentage was lowest in the five groups. The correlations between Net VO_2 and total work were significant only in the groups of 100 m (r=0.858: p&lt0.05) and 400 m runner (r=0.857: p&lt0.01). The correlations of O_2debt and total work, and VO^^._2max and NetVO_2 were significant in all subjects (r=0.610, p&lt0.01; r=0.600, p&lt0.01), however, both relations were not significant in each group. These results suggest that in the athletes with high anaerobic capacity Net VO_2 markedly contribute to perform a short-strenous exercise. In general, maximum oxygen uptake might be associated with an increase of Net VO_2 during short-strenous exercise, but there was no relation between Net VO_2 and VO^^._2max in the trained subjects.