英文摘要
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Purpose: Previous researches indicated that energy efficiency of hip and trunk demonstrated a great influence on throwing distance during the throwing and release phase. So, the current study tried to use the linkage of the mid-point of right and left anterior superior iliac spine and shot put as a vector and measure the angle of the vector relative to the sagittal axis in two dimensions. The purpose of the current study was to compare the difference of the kinematics including the BAX angle between the Glide and Rotational technique and understand the relationship between the kinematic, kinetic energy parameters and throwing distance. Methods: Five Glide technique and 5 Rotational technique shut-putters with 11 successful shot divided were selected in the National Game of Taiwan in 2013. A Sony DCR-PC330 DV camera (Tokyo, Japan) was used to capture their movement and Kwon 3D 3.1 version (Visol, Korea) was used to digitize and calculated each kinematic parameter. Results: It showed that the glide and rotational technique were significantly different (p < .05) in the time duration of throwing, throwing angle, BAX angle and trunk angle at the instant of the leading leg touch down the ground and BAX angle at the instant of the opposite leg off the ground. The throwing distance of the glide technique was positively correlated with the release velocity and linear kinetics at the instant of the release (p < .05). The throwing distance of the rotational technique was positively correlated with the release velocity, BAX angle and trunk angle at the instant of the opposite leg off the ground, and the BAX angle, trunk angle and linear kinetic at the instant of the release (p < .05). Conclusion: The key moment influencing the glide technique was the throwing phase and the instant of the release while that influencing the Rotational technique was the releasing phase and the instant of the release. The BAX angle should be decreased in the Glide technique at the instant of leading leg touch down the ground while that should be increased in the rotational technique in the releasing phase.
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参考文献
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