| Summary: | 碩士 === 臺北市立大學 === 競技運動訓練研究所 === 102 === Abstract
Purpose: The purpose of this study was to investigate the effects of different plyometric training on lower limb power, speed, agility and direction-specific movement velocity of junior high school table tennis players. Methods: Twenty participants were chosen from a junior high school table tennis team. They were randomly divided into two groups: the forward-jump training group (n = 10) and the cross-jump training group (n = 10). Besides regular table tennis training, each group had to receive different plyometric training sessions, which lasted for two weeks with three times per week, and lower limb power, speed, agility and direction-specific movement velocity were assessed before and after the training session. Statistical analyses were carried out by utilizing ANCOVA. Results: 1. Regarding the lower limb jump, the cross-jump training group (32.21 ± .91cm) shows significantly higher improvement than the forward-jump training group (30.00 ± .89 cm) (p＜. 05). 2. Regarding the speed, the forward-jump training group (5.21 ± 0.10 sec.) shows significantly higher improvement than the cross-jump training group (5.23 ± 0.10 sec.)( p＜.05). 3. Regarding the agility, the cross-jump training group (3.01 ± 0.14 sec.) shows significantly higher improvement than the forward-jump training group (3.24 ± 0.14 sec.)( p＜.05). 4. Regarding the direction-specific movement velocity, the cross-jump training group (8.85 ± 0.20 sec.) shows significantly higher improvement than the forward-jump training group (9.28 ± 0.20 sec.)( p＜.05). Conclusion: Both plyometric training sessions can increase the stretch-shortening cycle stimulus, enhance the rate of muscle activation and the mechanic effect of jumping activities, which could improve the performance of the lower limb power, speed, agility and direction-specific movement velocity. Nevertheless, the result shows that, since cross-jump group makes a more significantly improvement compared with the forward-jump group, it is believed that plyometric training session designed based on the types of sports bring about better effects than traditional forward-jump training session.
Keywords: stretch-shortening cycle, forward jump, cross jump, inverted funnel principle
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