Comparing trapezius muscle activity in the different planes of shoulder
elevation |
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| Authors: | Tomonobu Ishigaki Tomoya Ishida Mina Samukawa Hiroshi Saito Motoki Hirokawa Yuya Ezawa Makoto Sugawara Harukazu Tohyama Masanori Yamanaka |
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| Affiliation: | 1) Graduate School of Health Sciences, Hokkaido University, Japan;2) Matsuda Orthopedic Memorial Hospital, Japan;3) Hokushin Hospital, Japan;4) Faculty of Health Sciences, Hokkaido University, Japan |
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| Abstract: | [Purpose] The purpose of this study was to compare the upper, middle, and lower trapeziusmuscles’ activity in the different planes of shoulder elevation. [Subjects] Twenty malesubjects volunteered for this study. [Methods] Surface electromyographic (EMG) activityfor each of the three regions of the trapezius muscles in the three different planes ofelevation were collected while the participants maintained 30, 60, and 90 degrees ofelevation in each plane. The EMG data were normalized with maximum voluntary isometriccontraction (%MVIC), and compared among the planes at each angle of elevation. [Results]There were significantly different muscle activities among the elevation planes at eachangle. [Conclusion] This study found that the three regions of the trapezius muscleschanged their activity depending on the planes of shoulder elevation. These changes in thetrapezius muscles could induce appropriate scapular motion to face the glenoid cavity inthe correct directions in different planes of shoulder elevation.Key words: Trapezius muscle, Plane of shoulder elevation, EMG |
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