Ventilation volume(E), oxygen consumption (O_2), CO_2 production (CO_2), respiratory quotient (RQ) and E/O_2 were determined in the course of exercise test.

• 计算肺通气量 (V? E)、氧耗量 (V? O2 )、二氧化碳产生量 (V? CO2 )、呼吸商(RQ )及氧通气当量 (V? E/ V? O2 )。