Effects Of Different Stretching Modes And Delayed Time On Vertical Jumps

Stretching is a very important content in training and warm-ups before competitions. As for many coaches and athletes can not come to a compromise in the modes of stretching exercises in conditioning programs, it makes stretching to a degree have different impacts on the efficiency of specific training. It is a controversy in treating the relationship power and stretching training because of the negative effects on each other, so it is hard to make an agreement on power and stretching concurrent training. Therefore, it is promote the efficiency of power training as well as flexibility training. Based on the above considerations, this paper is to investigate the effects of common stretching modes on peak and average power in vertical jumps, and try to provide a reference for correct stretching exercise.This paper employed literature, expert interview, and test, statistics, selecting20male physical education students in Xi’an Physical Education University as the objects of this study, to research on the effects of jogging and stretching with different combination on vertical jumps. According to sports training practice,5modes of10min jogging only,10min jogging+static stretching,10min jogging+dynamic stretching,10min jogging+inter-set continuous static stretching, and10min jogging+inter-set continuous dynamic stretching as warm-up activities respectively with immediate,5min,10min,15min delay time were processed for investigating the effects of different modes of warm-up on Countermovement vertical Jump (abbreviated as CMJ) test, and analyzing the test data.The results show that:(1) By comparison, the dynamic stretching between sets has most favorable effects on CMJ, the height of CMJ increased by2.3%than control sate, meanwhile, inter-set static stretching has the most negative effect on CMJ by decreasing4.3%than the initial state;(2) The order of effects of5modes of jogging and stretching on CMJ from little to great is:inter-set dynamics stretching, jogging only, dynamic stretching, static stretching and inter-set static stretching.(3) It makes different of delay times of stretching on CMJ. The results showed that0minute delay of stretching had an advantageous effect on CMJ, and CMJ decreased after10min delay.Conclusion:(1) Different stretching and jogging combinations have different effects on CMJ.(2) Different delay time of different modes of stretching and jogging have different effects on CMJ.(3) The static stretching changed muscle length and muscle stiffness and pinnate angles, causing the declining ability of muscle contraction; Dynamic stretching is accord with muscle contraction characteristics, so promote the function of CMJ more obviously.