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在海拔３４１７ｍ对１８名健康世居藏族和１６名移居汉族用Ｊｅａｇｅｒ气体代谢自动分析系统和心阻抗图测定了无氧阈（ＡＴ）和最大摄氧量（Ｖ·Ｏ２ｍａｘ）时的ＳＶ、ＣＯ、ＰＥＰ／ＬＶＥＴ和ＳａＯ２。结果显示：在海拔３４１７ｍ测得ＡＴ值明显低于海平面；世居藏族ＡＴ出现较晚，并且ＡＴ时的功率、Ｖ·Ｏ２、ＭＶ、ＨＲ、ＣＯ、ＳＶ均高于移居汉族，而ＰＥＰ／ＬＶＥＴ比值小于移居组（Ｐ＜０．０１）；两组的ＳＶ峰值出现时间不同，世居组在ＡＴ或ＡＴ以后出现的占７２％，而移居组仅占３１％（Ｐ＜０．０５）；在最大负荷运动时，世居组的ＳａＯ２为８２．７４％，较运动前下降了８．９％，而移居组的ＳａＯ２为７６．５％，较运动前下降了１３．７％。研究结果提示，心泵功能是影响ＡＴ的重要因素之一。世居组ＡＴ出现的较晚，与其心肺储备功能强和组织细胞利用氧的能力较高有关，这是世居藏族对高原低氧环境长期适应的结果。
At 3417m above sea level, 18 healthy native Tibetans and 16 immigrants were enrolled in this study. The mean arterial pressure (AT) and maximum oxygen uptake (V · O2max) of SV, CO, PEP / LVET and SaO2. The results showed that the AT value measured at 3417 m above sea level was significantly lower than that at sea level. The late-onset AT appeared in the world and the power, V · O2, MV, HR, CO, and SV at AT were higher than those of immigrant Han at P AT / LVET (P <0.01). The appearance time of SV peak was different between the two groups. The incidence of SV peak was 72% in the native group and only 31% in the migrated group (P <0.05). In the maximum load exercise, the SaO2 was 82.74% in the native group, a decrease of 8.9% compared with that before exercise, while SaO2 in the migrated group was 76.5%, which was 13.7% lower than that before exercise. The results suggest that cardiac pump function is one of the important factors that affect AT. The late appearance of AT in the native group was related to its strong cardiopulmonary reserve function and higher ability of tissue cells to utilize oxygen, which is the result of the long-term adaptation of the native Tibetan to the plateau hypoxic environment.