| Summary: | 博士 === 中國文化大學 === 體育學系運動教練碩博士班 === 106 === Running single-legged vertical jump always shows up in exercise occasions, but there are few studies on this movement or jumping mechanism. The purpose of the present study was to compare differences between kinematic, kinetic and EMG in different approach speed and distance on running single-legged vertical jump. Twenty-five male elite college athletes volunteered to participate in this study. They performed running single-leg vertical jumps with two approach speed and three distance randomly. Three successful trials were collected for each jumping condition. The kinematic and kinetic data were collected by 11 infrared high speed cameras (200Hz), a AMTI force platform (1000Hz) and Delsys wireless surface EMG system (2000Hz). All data were synchronized by EvaRT 4.6 software. Raw data were resampled at 200 Hz by the MotionMonitor software for further analyses. The jump heights were found significantly greater with fast approach speed. The horizontal velocity of center of mass, loading rate, impulse, ankle stiffness, activation of tibialis anterior and gastrocnemius were found significantly larger with the increased approach speed and distance. But the hip stiffness and activation of rectus femoris only showed significantly larger with the increased approach distance. Faster and longer approach distance increased the lower extremity loading and caused higher power output and SSC effect. The optimal jumping performance was found when the horizonal velocity of center of mass reached 4m/s. The muscle activation level of lower extremity improved when the approach distance was longer than 6 m. The loading of running single-legged vertical jump can be cotroled by the approach speed or distance in order to enhance the jumping performance or training effect.
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