海拔3417m世居及移居者无氧代谢阈与左心功能关系的探讨

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阴抗图测定了无氧阈和最大摄氧量时的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、ＶＯ２、ＭＶ、ＨＲ、ＣＯ、ＳＶ均高于移居汉族，而ＰＥＴ／ＬＶＥＴ比值小于移居组；两组的ＳＶ峰值出现时间不同，蕊居组在ＡＴ或ＡＴ以后出现的占７２％

Relationship between Anaerobic Threshold and Cardiac Function in Native Tibetans and Han Migrators at 3417m Altitude.

Cardiac and pulmonary functions were examined at an altitude of 3417m in 18 healthy male native Tibetans and 16 Han immigration male residents(matched for age,height and weight).The results showed that:(1)There was a significant decrease in anaerobic threshold (AT) at the altitude of 3417m as compared with that at sea level;(2)At AT the Tibetants had greater O 2 uptake,exercise workload,minute Volume(MV),heart rate(HR),cardiac output(CO) and stroke volume(SV) as compared with the Hans,but P/L(pre-ejection-period/lift ventricular ejection time) was shorter than the Hans;(3)Peak of SV appeared at AT or behind AT was 72% in the Tibetans but only 31% in the Hans(P<0.05);(4)At maximal workload SaO 2 was 82.47% in the Tibetans and 76.5% in the Hans (P<0.01).These results suggested that cardiac function was one of the important factors affecting AT.The increase of cardiac-pulmonary reserve function in the Tibetans might reflect the genetic adaptation of the Tibetans to hypoxic environment.