トレッドミル歩行時の二酸化炭素排出量及び血中乳酸値に及ぼす高酸素吸入の影響

概要

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The purpose of this study was to investigate the effects of hyperoxic gas inhalation on carbon dioxide output (Vco_2) and blood lactate concentration during endurance exercise at low intensity. Two males and four females performed 30 min of treadmill walking during normoxia (normal air) and hyperoxia (59.6% O_2). In normoxic condition, heart rate and oxygen uptake during exercise were 139±7 beats/min (69.5% HRmax) and 1630±557 ml/min (26.0 ml/kg/min), and exercise intensity was 6.2 Mets. Heart rate, ventilation, Vco_2,and blood lactate concentration during exercise were obtained in both condition. These physiological parameters were significantly lower in hyperoxia compared with normoxia. Mean value of Vco_2 during exercise with normoxia was 1302±496 ml/min while in hyperoxia was 1208±518 ml/min. The difference was statistically significant (p=0.003). The blood lactate concentration in normoxia was 2.02±0.85 mM while in hyperoxia was 1.47±0.59 mM in like manner. The difference was statistically significant also (p=0.018). It was supposed a decrease in value of the respiratory exchange ratio from the result of a decreased Vco_2 in hyperoxia. These results would suggest that hyperoxia might depress glycolysis and thus enhance fat utilization in endurance exercise at low intesity.
新潟国際情報大学の論文