Electromyographicai Study of the Extension of the Upper Extremity

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  • 上肢の伸展動作の筋電図的研究
  • ジョウシ ノ シンテン ドウサ ノ キンデンズテキ ケンキュウ

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The function of the muscles which take part in the extension of the upper extremity was electromyographically investigated. The results obtained are as follows.<BR>1. M. teres major, M. triceps brachii caput longum and M. latissimus dorsi effectively work during extension of the arm to the resting position from the full elevated position.<BR>2. When the arm is elevated, M. pectoralis major has some components of force in the extension, and when the arm is extended, M. deltoideus pars spinata has some components of force in the extension.<BR>3. The electromyographic discharge patterns of M. pectoralis major pars abdo-minalis and M. deltoideus pars spinata in the extension of the upper extremity sug-gest the direction of resistance against extension movement.

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