Effect of turn skill on expired gas dynamics during 20 meters shuttle running test

抄録

　The purpose of this study was to compare the dynamics of the relative intensity of maximal oxygen uptake (%VO²max) during 20-meter shuttle running test (SRT) with that during treadmill running test (TRT), and to determine the effect of the degree of turn skill to expired gas dynamics during SRT. Subjects were 4-male rugby players (RP), 4-male long-distance runners (LD) and 4-untrained males (UM). Initially, the maximal oxygen uptake (VO²max) of all subjects was measured. Subjects then underwent SRT and TRT. The protocols of SRT and TRT were the same except that there was turn motion in SRT. Subjects continued SRT until exhaustion, while they stopped TRT at the same time as in SRT. A portable metabolic cart (MetaMax 3B) measured ventilation, oxygen uptake (VO²), and carbon dioxide output (VCO²) throughout all exercise tests. Differences in expired gas dynamics between SRT and TRT were analyzed by general liner mixed model (GLMM) with three withinsubjects- factors (test-type, time, group). The relative intensity (%VO²max) of SRT was signifi cantly higher than that of TRT. The interactions (group*time) related to the degree of turn skill were not signifi cant in VO² (F^19,187 = 0.70, P = .812) and VCO² (F19,187 = 0.57, P = .922) dynamics. These results indicate that the relative intensity of SRT is high, and that the degree of turn skill does not infl uence VO² and VCO² dynamics during SRT.