The Effects of Elbow Joint Angle Change on the Elbow Flexor Muscle Activation in Pulley with Weight Exercise
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- Kang Taewook
- Department of Physical Therapy, Graduate School of College of Medical and Life Science, Silla University
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- Seo Youngjoon
- Department of Physical Therapy, Graduate School of College of Medical and Life Science, Silla University
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- Park Jaehoon
- Technical Research Center, Wellthech Corporation
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- Dong Eunseok
- Technical Research Center, Wellthech Corporation
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- Seo Byungdo
- Department of Physical Therapy, College of Health and Welfare, Kyungwoon University
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- Han Dongwook
- Department of Physical Therapy, College of Medical and Life Science, Silla University: 700 Beon-gi, 140 Baegyang-daero, Sasang-gu, Busan 617-736, Republic of Korea
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[Purpose] This research investigated the effect of angular variation of flexion of the elbow joint on the muscle activation of elbow flexor muscles. [Subjects] The research subjects were 24 male college students with a dominant right hand who had no surgical or neurological disorders and gave their prior written consent to participation with full knowledge of the method and purpose of this study. [Methods] The subjects’ shoulder joints stayed in the resting position, and the elbow joint was positioned at angles of 55°, 70°, and 90°. The angle between the pulley with weights and forearm stayed at 90°. Surface electromyography was used to measure muscle activities. Three measurements were made at each elbow angle, and every time the angle changed, two minutes rest was given. [Result] The muscle activities of the elbow flexors showed significant changes with change in the elbow joint angle, except for the biceps brachii activities between the angles of 55° and 70° of elbow flexion. The muscle activities of the biceps brachii and brachioradialis showed angle-related changes in the order of 55°, which showed the biggest value, followed by 70° and 90°. [Conclusion] In order to improve muscle strength of the elbow flexor using a pulley system, it seems more effective to have a 90° angle between the pulley with weights and the forearm when the muscle is stretched to a length 20% greater than its resting position.
収録刊行物
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- Ｊ Ｐｈｙｓ Ｔｈｅｒ Ｓｃｉ
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Ｊ Ｐｈｙｓ Ｔｈｅｒ Ｓｃｉ 25 (9), 1133-1136, 2013
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