高原地区青少年无氧代谢阈值的特征及其影响因素的探讨

THE FEATURES AND THE IMPACT FACTORS IN THE EFFECTS OF HIGH ALTITUDES TO THE ANAEROBIC THRESHOLD IN IMMIGRANT ADOLESCENTS AT DIFFERENT ALTITUDES

目的 探讨不同海拔低氧环境对移居青少年无氧代谢闲值的影响。方法 使用Jaeger自行车功量仪，心阻抗仪，用逐级运动负荷法分别测定移居海拔2260m、3417m和4280m三个海拔高度，13-16岁青少年的无氧代谢闲值（AT），同步测定动脉血氧饱和度（SaO2）和心输出量（CO），分析其间的相互关系。结果 AT值随海拔高度的上升而下降，以氧耗量表示，分别为（27.44±6．50）、（22．88±5．38）和（16．95±5.97）ml／min·kg。AT值的降低与Sa02和CO的降低呈正相关。结论 SaO2和CO是影响AT值的重要因素。长期移居高海拔的青少年AT值降低，海拔越高，降低越明显。

Objective To investigate the effects of high altitudes to the anaerobic threshold in immigrant adolescents at different altitudes. Methods The arterial oxygen saturation （ Sa% ）, cardiac output （ CO ） and anaerobic threshold {AT} were measured by gradual loading bicycle cargo meter in immigrant adolescent （ 13 - 16 year old} who resided at 2260 m,3417 m,and 4280 m respectively. Results The AT values were decreased in an altitude - dependent manner, the oxygen uptake （ Vo2 ） were （ 27.44 ± 6.50 ）, （ 22.88 ± 5.38 ） and （ 16.95 ± 5.97 ） ml/min · kg, respectively. （ P 〈 0.05 ）. The decreased AT values were positive correlated with Sao2 and CO. Conclusion It is concluded that the lifelong exposure to a hypoxic environment will lead the AT values significantly decreased.