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目的 :观察进驻海拔 3 680m青年的通气无氧阈 ;方法 :受试者坐于踏车功量机上 ,以 60rpm连续蹬车 ,每 3分钟递增 2 5W ,蹬车至力竭时停止 ,用O2 CO2 气体测定仪分析每个负荷最后半分钟的O2 和CO2 ,用心电图机同步记录心率 ,计算肺通气量 ( ·VE)、氧耗量 ( ·VO2 )、二氧化碳产生量 ( ·VCO2 )、呼吸商 (RQ)及氧通气当量 ( ·VE/ ( ·VO2 ) ;结果 :·VE、·VO2 、·VCO2 在功率达 75W时出现明显增加 ;RQ在功率达 75W时出现“拐折点” ;·VE/ ·VO2 在功率达 75W时由下降转向平稳 ;结论 :进驻海拔 3 680m青年通气无氧代谢阈为功率 75W。
OBJECTIVE: To observe the ventilatory anaerobic threshold of youths stationed at 3 680m above sea level.METHODS: Subjects were seated on a treadmill weighing machine and were continuously pedaled at 60rpm, increasing 25W every 3 minutes. When the pedaling stopped to exhaustion, The CO2 gas analyzer analyzed the O2 and CO2 in the last half minute of each load, and simultaneously recorded the heart rate with an electrocardiograph to calculate the pulmonary ventilation (· VE), oxygen consumption (· VO2), carbon dioxide (· VCO2), respiratory quotient (RQ), and oxygen aeration equivalence (· VE / (· VO2). Results: · VE, · VO2, · VCO2 significantly increased at 75W; RQ “inflection point” at 75W · VE / · VO2 turns steady from descending to 75W; Conclusion: The anaerobic metabolism threshold of 3 680m altitude ventilation stationed at altitude is 75W.