| Summary: | 碩士 === 國立成功大學 === 工程科學系碩博士班 === 96 === Exercise and Strengthening of the Upper Extremity is becoming popular. How to avoid injuries during training process is an important issue. The purpose of this study was to investigate the effect of hyper-extension on elbow joint loading during kinetic chain exercise of the upper extremity.
Twenty-four healthy male students with no trauma history volunteered for this study(twelve for elbow normal type and elbow hyper-extension type each). They were asked to complete open kinetic chain(Bench press) and closed kinetic chain(Pushup). The Expert Vision Motion Analysis System with eight CCD cameras, and a Kistler force plate was used to measure the relative joint position and ground reaction force. Also surface EMG was used to measure muscle activity.
During closed kinetic chain exercise(Pushup), elbow hyper-extension type was found has greater elbow flexion/extension angular acceleration and greater elbow internal/external force change rate during cycle of 85% ~ 100% period. Also larger range of motion for elbow hyper-extension type which makes greater work during one cycle.
During open kinetic chain exercise(Bench press), elbow hyper-extension type was found has greater elbow flexion/extension angular acceleration and greater elbow internal/external and anterior/posterior force change rate during cycle of 85% ~ 100% period. Also larger range of motion for elbow hyper-extension type which makes greater work during one cycle.
This study provides information about the difference between elbow normal type and elbow hyper-extension type of the upper extremities, and how force change rate and Elbow flexion/extension angular acceleration changed occurred at the elbow beyond Hyper-extension. We suggested that elbow Hyper-extension subjects must be careful during cycle of 85%~100%. As possible as elbow Hyper-extension subjects can not to do the active exercise to avoid elbow injuries.
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