一定負荷運動時のガス交換動態から見た換気高進と二酸化炭素過剰排出との連関について

概要

論文の詳細を見る
Gas exchange kinetics during constant-load exercise were measured to investigate the possibility that excess CO_2 output during exercise might not be dependent on hyperventilation. Five healthy males performed twelve minutes of cycle exercise, including two minutes of 0 W pedaling, at 20, 40, 50, 60, 70, and 80% of their maximal work rate (WR_<max>) determined on the basis of preliminary ramp exercise of 30 W/min. Minute ventilation, O_2 uptake, and CO_2 output were measured breath-by-breath. Excess CO_2 output and CO_2 stores were calculated, assuming that the respiratory quotient (RQ) in tissue is constant during constant-load exercise and that the respiratory exchange ratio at the mouth level is equal to the RQ during the steady-state phase. Excess CO2 output was observed at levels of WR greater than 40% WR_<max> after initial CO_2 storage, where V^^._<co_2>/V^^._E decreased gradually as though in parallel with the kinetics of CO_2 storage. V^^._<o_2>/V^^.__E, however, appeared to be constant after the initial peak. These data suggest that V^^.__E is closely correlated with V^^._<o_2> rather than V^^._<co_2> during constant-load exercise, indicating that excess CO_2 output to compensate lactate production is independent of hyperventilation.
日本体力医学会の論文
1991-10-01