英文摘要
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Purpose: To compare lower extremity biomechanics during the take-off phase of front-row spike and back-row spike tasks in order to further provide the information for the teaching and training in these skills. Methods: Kinematics and ground reaction force data were synchronized to obtain from ten subjects, using six Qualisys cameras (180 Hz) and two AMTI force palates (1800 Hz). Data were analyzed by using the MotionMonitor analysis software. An inverse dynamic process was used to calculate the kinetically parameters for the lower extremity. Statistical analysis was used the t-test to evaluate the differences in dependent variables between two spike skills. The significance level was set at α = .05. Results: The back-row spike skill had a significantly shorter movement time of take-off phase and a longer step distance than the front-row spike skill. The back-row spike skill produced a significantly greater peak ankle extension moment, peak ankle extensors' eccentric power, peak hip extensors' eccentric power, and peak hip extensors' concentric power in comparison to the front-row spike skill in lead leg. The back-row spike skill produced a significantly greater peak ankle extension moment, peak ankle extensors' eccentric power, and peak knee and hip extensors' concentric power in comparison to the front-row spike skill in trail leg. Conclusions: Spike skill at back-row in volleyball players required greater leg strength and power to form a faster take-off as well with greater step distance. This can enhance the rush forward benefits for jumping toward the upper front.
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