本文利用心脏、呼吸测定分析系统及每次运动都进行血乳酸测定的方法,测定了中长跑运动员在一定速度下步频变化对跑步效率的影响.研究发现,步频与耗氧量、每公斤体重耗氧量、能量消耗、血乳酸等值的变化有关,表现为自由步频消耗最低,效率最高.因此,在确认一定速度情况下,自由步频应为最佳步频.这为在跑步实践中避免能量的多耗提供了科学依据. In this paper, heart, respiration analysis system and every exercise for blood lactate determination method, the determination of the long-distance runners at a certain speed step frequency changes on the running efficiency.Studies found that the pace and oxygen consumption per kilogram Body weight oxygen consumption, energy consumption, changes in blood lactic acid equivalent, the performance of the lowest free-paced consumption, the highest efficiency, therefore, to confirm the speed of the case, the free pace should be the best pace. This is running In practice, to avoid excessive energy consumption provides a scientific basis.