| Summary: | 碩士 === 國立體育大學 === 運動保健學系 === 105 === Background and Purpose: Change of direction (COD) ability is an important ability in competitive tennis. It is an important issue that how to increase the COD ability. The leg muscle qualities demand in COD ability is consist of strength, power, reactive strength. Plyometric training is based on Stretch-Shortening Cycle (SSC), and the SSC movement is similar to the COD movement. Previous studies demonstrated that plyometric training can be effective on improving COD ability; however, general plyometric training is hard to monitor the training volume and the intensity, typically difficult during the movement eccentric contraction phase. Compared to the general plyometric training with free weight, the passive repetitive plyometric training (PRP training) is more stable and safer, and it can relieve the above mentioned problems. The purpose of this study was to investigate the effects of the PRP training on COD ability.
Method: Thirteen college tennis players were recruited and divided into the experimental group (n=7) and control group (n=6). The experimental group received a 6-week PRP training program, with 3 times per week. To evaluate the effectiveness of the training program, two groups performed countermovement jump test (CMJ test) and 505 agility test before and after 6 weeks.
Result: After a 6-week PRP training, the experimental group significant improved the power and force in CMJ test, and significantly improved the 0 to 10m (sprint period) result in 505 agility test, but no significant changes in the 10 to 15 to 10m (change of direction period) in 505 agility test were found.
Conclusion: After a 6-week PRP training, lower extremities power and force were significantly improved, and the effect on SSC ability can be transferred to the sprint ability, but no effect on the COD ability was shown. The PRP training can be effective on improving the sports performance in lower extremities in tennis players.
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