近年來由於生活品質提高，使得休閒運動的風潮盛行，利用伏地挺身運動來鍛鍊身體是很常見的。回顧前人文獻，發現在改變身體姿態來做伏地挺身的研究上已做過詳細探討，此外速度因子也是一個重要的因素，故本實驗目的就是接續分析不同伏地挺身的速度對上肢肌肉骨骼系統的影響。
透過非侵入式的動態分析系統來模擬上肢各關節在不同伏地挺身速度下時所承受的負載情形，以及量測上肢肌肉的表面肌電訊號
，希望了解不同伏地挺身的速度對於上肢肌肉的訓練成效和提供各關節在動態負載下預防受傷的機制。
設計在三種不同頻率速度(快：1~1.5s、中：1.5~2s、慢：2~2.5s)下做伏地挺身動作，針對14位健康且慣用手為右手的年輕男性，計算出腕、肘、肩關節在做伏地挺身時的受力與受力矩，以及同步量測胸大肌、前中後三角肌、三頭肌、肱二頭肌、脊上肌、脊下肌的肌肉活化。
實驗結果發現，在關節受力與關節受力矩方面：各關節的最大受力與受力矩發生在“Down”狀態附近；且快速組明顯不同中、慢速組的變化模式，速度越快數值越大。 在“Up”狀態下的各關節的初始受力與受力矩也受速度因子影響。在各肌肉活化情形：發現在起身過程中肌肉是較活化的狀態；以總活化值來比較下，快速組與中速組是差不多的，但慢速組有明顯地較大訓練程度，尤其在放慢速度的訓練下對胸大肌、前後三角肌、三頭肌、肱二頭肌有加強訓練的效果。基於以上的結果，快速組的關節受力大、肌肉訓練成效小，但節省時間。中速組的關節受力小，但肌肉訓練成效也小。慢速組的關節受力小、各肌肉訓練成效大是最佳選擇。

Objectives. It’s an important factor to change the speed of push-up for upper extremity of musculo-skeletal-system. The objectives of study are to analysis joint force, moment and muscle activity of wrist, elbow, shoulder during different speed of push-up.
Methods. Using the motion analysis system, the kinematics and kinetics of the upper extremity joint were investigated and using the surface EMG, the muscle activity was measured under various speed of push-up.
Design. There are 13 Subjects of male. Subjects were asked to perform smooth push-up exercise in various speed group (faster:1~1.5s, regular:1.5~2s, slower:2~2.5s). The muscle activation was measured on the pectoralis major,deltoid,triceps,biceps brachii, supraspinatus, infraspinatus.
Results. The various speed of push-up affects significantly axial force, medial/lateral force and flexion/extension moment of the upper extremity joint. The muscle training is efficient in the condition of slower speed during push-up on petcoralis major, triceps, biceps brachii, and deltoid anterior, deltoid posterior.
Conclusions. During the long time, the training is good for preventing harm, and the muscles have better training results in the condition of slower speed.

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