不同运动强度下肺通气量随时间的变化特征

Characteristics of pulmonary ventilation volumes under different exercise intensity with time

目的观察不同运动强度下肺通气量(VE)随时间的变化,探讨不同运动强度下VE的最佳测量时间。方法以61名男性青年为受试对象,在功率自行车上进行不同强度(20、40、60、80、100、120、140、160、180 W)的运动,每一运动强度持续6 min;采用便携式心肺功能仪实时监测被试者运动过程中VE的变化。结果 (1)对于20 W强度的运动,初始时VE随时间快速上升,1 min后VE不再持续上升,进入稳定期,1 min与其后时间点的VE比较无显著性差异(P>0.05);(2)对于40、60 W强度的运动,初始时VE随时间快速上升,2 min后VE不再持续上升而进入稳定期,2 min与其后时间点的VE比较无显著性差异(P>0.05);(3)对于80、100、120、140、160 W强度的运动,VE在3 min时进入稳定期;(4)对于180 W强度的运动,VE在4 min时进入稳定期。结论在不同运动强度下VE达到稳定所需要的时间不同,与运动强度呈正相关;运动强度越大,VE达到稳定所需要的时间越长。

Objective To observe the changes of the pulmonary ventilation （VE）volume under different exercise intensities along with time, and to explore the best time for measuring VE under different intensities of exercise. Methods Sixty-one young reals were selected as subjects, who engaged in exercise of different intensities on the cycle ergometer （ 20, 40, 60, 80, 100, 120, 140, 160, and 180 W）. The duration of exercise of each intensity was 6 minutes, the cardiopulmonary function was detected using a portable instrument, and real time monitoring of VE changes was enforced. Results （ 1 ） For exercise of intensity 20 W, VE initially increased fast with time, but after 1 rain, it ceased to rise and remained stable. There was no significant difference at 1 rain and afterwards （ P 〉 0.05 ）. （2） The case was the same with exercise of the intensity 40 and 60 W. （3）For intensities of 80, 100, 120, 140,and 160 W, VE became stable at 3 rain. （4） For exercise of intensity 180 W, VE became stable at 4 rain. Conclusion The time taken for VE to achieve stability under different intensities is different, which is positively correlated with the intensity of exercise. The greater the intensity of exercise, the longer it takes to achieve stability.