The purpose of the present study was to investigate the effect of maximal interval training for 10 weeks on arterial oxygen saturation (SaO2) and ventilatory response during heavy exercise. Seven subjects volunteered for participation in the study. All subjects performed an interval training 4 days per week. Training protocol per day consisted of five periods of exercise of 3-min duration on a cycle ergometer at a power output on 100% maximal oxygen uptake (V̇O2max), interspersed with 2-min recovery cycle at 50%V̇O2max. V̇O2max and ventilatory data measured every week. SaO2, end-tidal oxygen partial pressure (PETO2), end-tidal carbon dioxide partial pressure (PETCO2) and the ventilatory equivalent for oxygen (V̇E/V̇O2) measured during 5-min heavy exercise at 90%V̇O2max every other week. V̇O2max significantly increased from 52.5±4.9 to 60.6±5.8 ml·ml-1·kg-1 during the training. Sao2 reduced significantly from 95.4±1.1 to 93.3±1.8%, similarly PETO2 and V̇E/V̇O2 reduced during the training. A significant positive correlation was found among SaO2, PETO2 and V̇E/V̇O2 during heavy exercise (SaO2-PETO2, r2=0.48, P<0.05 ; Sao2-V̇E/V̇O2, r2= 0.49, P<0.05; PETO2-V̇E/V̇O2, r2=0.81, P<0.05). These results suggest that ∼50% of the arterial O2 desaturation during heavy exercise can be accounted for by low ventilatory response. Therefore the maximal intervsal training induced arterial O2 desaturation during heavy exercise, which can be half explained by low ventilatory response.
|ジャーナル||japanese journal of physical fitness and sports medicine|
|出版ステータス||Published - 1996 2|
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