一雙健壯的上肢是人類生活必備條件，所以如何訓練一雙強壯的上肢，是一個非常重要的課題。其中仰臥推舉與立姿推舉是常用來訓練上肢的一種開放動力鏈（Open Kinetic Chain Exercise）運動。過去文獻中，對於下肢開放與閉鎖動力鏈的比較，一直是很熱門的題目。反觀上肢，在開放動力鏈方面的研究並沒很多。故本研究主要在目的在於利用動態分析系統，建立出一套上肢開放動力鏈運動實驗的測試模式與模型；本實驗邀請13位受測者參與實驗，並分析不同手部位握槓位置及不同姿勢的推舉動作，探討在關節受力與力矩上的差異性。
　　由本研究所建立的測試模式來計算上肢關節的受力情形可發現，不同的手部握槓位置，若採用握槓位置外擴者，可有效降低關節受的剪力。對不同姿勢的推舉動作，則以仰臥推舉在大部份的關節有較小的受力。

　　In order to have a pair of strong arms for our daily activities, it is very important to train and strengthen our upper extremities. Different types of open kinetic chain exercises, such as bench-press and standing-press, are popular exercises used in strengthening of the upper extremity. There were several studies investigating the biomechanics of the open kinetic chain exercises of the lower extremity. However, there is very little research regarding to the biomechanics of the open kinetic chain exercises of the upper extremity. Using the Motion Analysis System, the purpose of this study is to establish a biomechanical experimental model for the open kinetic chain exercises of the upper extremity. Furthermore, differences among different types of open kinetic chain exercises will be analyzed.
　　Thirteen subjects volunteered for this study. The subjects were asked to perform three sets of open chain exercises: bench-press with shoulder width, bench-press with 150 % of shoulder width, and standing-press. The kinetics and kinematics of the upper extremity were calculated and analyzed.
　　The joint loading were significantly different among the three sets of exercises. During open kinetic chain exercises, bench-press has smaller joint loading comparing to standing-press. Additionally, increasing the grip width to 150 % of the shoulder width can reduce the shearing forces on the upper extremity.
　　In this study, we have established a biomechanical experimental model for the open kinetic chain exercises of the upper extremity. The data provided in this study maybe helpful in strengthening and rehabilitation of the upper extremity.

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