Comparative study of the differences in shoulder muscle activation according to arm rotation angle |
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| Affiliation: | 1. Department of Physical Therapy, Graduate School, Inje University, Republic of Korea;2. Department of Physical Therapy, College of Biomedical Science and Engineering, Inje University, Republic of Korea, 607 Obangdong, Gimhae, Gyeongsangnam-do 621-749, Republic of Korea;3. Department of Physical Therapy, College of Nursing and Healthcare Sciences, Dong-eui University, Republic of Korea;4. Department of Physical Therapy, College of Medical and Life Sciences, Silla University, Republic of Korea;1. Discipline of Biomedical Science, Sydney Medical School, The University of Sydney, Australia;2. Discipline of Exercise and Sport Science, Faculty of Health Sciences, The University of Sydney, Australia;1. Department of Physical Therapy, Graduate School, Yonsei University, Wonju, South Korea;2. Department of Physical Therapy, Kinetic Ergocise Based on Movement Analysis Laboratory, College of Health Science, Yonsei University, Wonju, South Korea |
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| Abstract: | BackgroundScapular muscle exercise is important for patients with shoulder disorders. Distal variance leads to changes in shoulder muscle activation. Here, we aimed to determine whether scapular muscle activation is affected by different arm rotation angles.MethodsOverall, 30 healthy men participated in this study. The subjects were asked to keep their arms at 120 degrees of shoulder flexion while holding a 1.0-kg dumbbell in palms down (pronation) and palms up (supination) positions. Electromyography was used to measure anterior, middle, posterior deltoid, serratus anterior, upper, and lower trapezius muscle activation during the task. The muscle activations of each shoulder were compared between the pronation and supination positions.ResultsAnterior deltoid and serratus anterior activations were significantly higher in supination than in pronation (p < .05). Alternatively, posterior deltoid and lower trapezius muscles were significantly more activated in pronation than in supination (p < .05).ConclusionScapular muscle activation changed with arm rotation angle. Arm rotation angle should be assessed to estimate scapular muscle activation during exercise and motion analysis in clinical practice. |
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