We have studied the kinetics of mixed venous C02 pressure (Pi-,co2) at constant work rates of 300, 450 and 600 kpmlmin (Yano, 1986). The PVco, increased at the onset of exercise, and reached a steady state at 300 and 450 kpmlmin. However, at 600 kpmlmin, the PVco2 indicated a relatively high steady state in comparison with those at other work rates, and decreased after 5 min of exercise. This o...
