心肺功能运动试验对高原低氧耐力的预测

为探讨高原低氧耐力的预测指标,先对15名男性健康青年在海拔2261及3417m处进行心肺功能运动试验。结果观察到低氧通气及心搏反应及动脉血氧饱和度(SaO_2)变化出现较早且敏感。随后对15名科考队员、37名采金队员及38名世居藏族(均为健康男性),在海拔4520及5620m现场验证,在运动负荷(VO_2max)时,测定静息及运动时最大心率差值(HRD)、动脉血二氧化碳分压差值(PaCO_2D)及SaO_2差值(SaO_2D),由此求得HRD/SaCO_2D及PaCO_2D/SaO_2D两项指标,分别反映低氧心搏及通气反应能力,与低氧耐力相关密切,经实际验证,与登山能力及高原适应水平间亦有明显相关。

CARDIOPULMONARY EXERCISE TESTING FOR EVALUATION OF HYPOXIC EXERCISE TOLERANCE AT HIGH ALTITUDES

In order to study the physiological parameters for appraising hypoxic exercise tolerance at high altitude, fifteen young healthy men received cardiopulmonary exercise test at elevation of 2 261m and 3 417m. The results showed that the hypoxic ventilatory and cardiac responses, and the change of arterial oxygen saturation(SaO_2) appeared early and sensitively. Then, fifteen scientific climbers, thirty-seven golddiggers and thirty-eight native Tibetans(all of them are healthy men) who ascended to altitude 4 520m and 5 620m, all subjects tested by upright cycleexercise during VO_2submax of VO_2max. Then measured the HRD(HRmax subtract HRrest ), SaO_2D (SaO_2rest subtract SaO_2 exercise) and PaCO_2D(PaCO_2 exercise subtract PaCO_2 rest). The cardio-pulmonary responses are defined by the ratio: HRD/SaO_2D and PaCO_2D/SaO_2D. The results showed that these two parameters was significantly correlated to the hypoxic exercise tolerance, the climbing capacity and the altitude adaptability.