Abstract

There are close relationships between velocity pacing and performance of time trial sporting events. The variation of velocity pacing depends on the energy metabolism, so analyzing the variation characteristics based on energy metabolism will be helpful for the improvement of men's 1500 m running performance in China.

Firstly, this paper observed the tendency and variation characteristics of velocity pacing of men's 1500m running race; then designed and implemented the test on track, and analyzed the physiological factors affecting the performance of men's 1500m running, compared the differences of energy metabolism between the self-paced test for better performance and the intervention-paced test that was designed according to the velocity pacing variation model that was usually adopted for better place in international men's 1500m running competition; at last, based on the results of competition observation and tests, this paper synthetically discussed the reason for the formation and differences of variation of the ve locity pacing profile for men's 1500m running, here were conclusions：

(1)The relevant test protocols that were improved by this paper can be used to monitor and test the dynamic changes of energy metabolism in the whole course of running.

(2) Men's 1500m running is a kind of sport that depends on mixture-energy supply and the aerobic energy plays the basic role.The difference of aerobic power explained for the difference of performance be tween two groups of subjects.The fast group was superior in aerobic function than the slow group, and the VO2max closely correlated with the 1500m running performance.That suggested VO2max could be used as a key index to discriminate between different exercise level's subjects, and during the whole phase of training for male 1500m runners the improvement and maintenance of the aerobic capacity should be paid more attention.

(3) It showed similar tendency for velocity pacing in men's 1500m running, there were four distinctive sections appearing successively on the velocity pacing profile, these were fast start section, low speed section, acceleration section and speed keeping section.According to the different goals for the competition, the pacing profiles could change in time and amplitude, these might be divided roughly into two changing models: better performance pacing model and better place pacing model.

(4) In men's 1500m running, fast start had physiological and tactical advantages; purpose of low speed section was keeping anaerobic energy reserve with the reinforcement of aerobic metabolism; when to accelerating, how amplitude of acceleration was and how long the acceleration sector covered were decided by the two principles: the anaerobic reserve should be fully used, and the speed could not decline below the average speed.

(5) Compared with performance pacing 1500m running test, the intervention-paced test didn't influence VO2peak, but it depressed the oxygen uptakes during the whole halfway sector, and led to the most VO2 drop phenomenon appearing in the end sector.That indicated the velocity pacing variation model usually adopted for better place in competition could influence the aerobic energy supply and impede athletic performance significantly.

(6) The gap of performance between world elite and Chinese men's 1500m runners was rooted in the physiological functions and energy metabolism levels.Therefore, the breakthrough in velocity pacing for Chinese athletes should be based on the improvement of physiological functions and energy metabolism levels.

Key words: men's 1500m running; velocity pacing tendency; velocity pacing variation; energy metabolism; oxygen uptakes kinetics