| Summary: | 碩士 === 國立臺北教育大學 === 體育學系碩士班 === 103 === The purpose of this study was to investigate the effect of different knee starting angles on the Pre-Blocking movement Performance in Volleyball during counter movement jump. Ten healthy malescollege volleyball players of the best group and within a year was not injured (aged = 20.20± 1.32 year, height = 178.70± 3.95 cm ,weight = 73.45 ± 7.72 kgf）were participated in this study. A Mega Speed 30 Ks camera (100Hz) and an AMTI force plate(1000 Hz) were usedeffect of different postures in Prepared-Squatting to the Volleyball block action being performed. The Kwon3D and DASYLab 6.0 software were used for further analyses of the data and the process that from the lowest body center of gravity.The SPSS 10.0 statistic software were used in this study together with the analytic method of the Repeated Measures of ANOVA
(α=.05). In kinetic ,the results indicated that the larger impulse during the counter movement jump and The maximum ground reaction force was observed under the knee starting angle 180°condition than 160°and140°condition(p< .05)；In kinematics, the results indicated that the larger jump height and angular displacement of the knee joint anglewas observed under the knee starting angle 180°condition than 160°and140° condition(p< .05). The study concluded that different knee starting angles could influence the jumping performance and the bigger angle could lead to infavor of impulse accumulation and improve jumping performance.
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