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Kang MH, Oh JS, Jang JH. Differences in Muscle Activities of the Infraspinatus and Posterior Deltoid during Shoulder External Rotation in Open Kinetic Chain and Closed Kinetic Chain Exercises. J Phys Ther Sci. 2014;26(6):895-7doi: 10.1589/jpts.26.895.
Kang, M. H., Oh, J. S., & Jang, J. H. (2014). Differences in Muscle Activities of the Infraspinatus and Posterior Deltoid during Shoulder External Rotation in Open Kinetic Chain and Closed Kinetic Chain Exercises. Journal of physical therapy science, 26(6), 895-7. https://doi.org/10.1589/jpts.26.895
Kang, Min-Hyeok, et al. "Differences in Muscle Activities of the Infraspinatus and Posterior Deltoid during Shoulder External Rotation in Open Kinetic Chain and Closed Kinetic Chain Exercises." Journal of physical therapy science vol. 26,6 (2014): 895-7. doi: https://doi.org/10.1589/jpts.26.895
Kang MH, Oh JS, Jang JH. Differences in Muscle Activities of the Infraspinatus and Posterior Deltoid during Shoulder External Rotation in Open Kinetic Chain and Closed Kinetic Chain Exercises. J Phys Ther Sci. 2014 Jun;26(6):895-7. doi: 10.1589/jpts.26.895. Epub 2014 Jun 30. PMID: 25013291; PMCID: PMC4085216.
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J Phys Ther Sci. 2014 Jun;26(6):895-7. doi: 10.1589/jpts.26.895. Epub 2014 Jun 30.

Differences in Muscle Activities of the Infraspinatus and Posterior Deltoid during Shoulder External Rotation in Open Kinetic Chain and Closed Kinetic Chain Exercises.

Journal of physical therapy science

Min-Hyeok Kang, Jae-Seop Oh, Jun-Hyeok Jang

Affiliations

  1. Department of Rehabilitation Science, Graduate School, Inje University, Republic of Korea.
  2. Department of Physical Therapy, College of Biomedical Science and Engineering, Inje University, Republic of Korea.
  3. Department of Physical Therapy, Haeundae Jaseng Hospital of Oriental Medicine, Republic of Korea.

PMID: 25013291 PMCID: PMC4085216 DOI: 10.1589/jpts.26.895

Abstract

[Purpose] This study investigated the changes in electromyographic (EMG) activities of the infraspinatus and posterior deltoid muscles during shoulder external rotation under open kinetic chain (OKC) and closed kinetic chain (CKC) exercise conditions. [Subjects] In total, 15 healthy males participated in this study. [Methods] Subjects performed shoulder external rotations under CKC and OKC conditions while standing with and without weight support provided by a height-adjustable table. Pressure biofeedback was used to ensure a constant amount of weight support. The activities of the infraspinatus and posterior deltoid muscles during shoulder external rotation were measured using a wireless surface EMG system. The paired t-test was used to compare the EMG activities of the infraspinatus and the posterior deltoid muscles and the ratio of the infraspinatus to the posterior deltoid during shoulder external rotation under OKC and CKC conditions. [Results] The EMG activity of the infraspinatus and the ratio of the infraspinatus to the posterior deltoid activities were significantly increased, whereas the posterior deltoid activity was significantly decreased under the CKC condition compared to the OKC condition. [Conclusion] Clinicians should consider the CKC shoulder external rotation exercise when they wish to selectively strengthen the infraspinatus.

Keywords: Infraspinatus; Posterior deltoid; Selective muscle strengthening

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