Selective activation of intra-muscular compartments within the trapezius muscle in subjects with Subacromial Impingement Syndrome. A case-control study |
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| Institution: | 1. UOIT-CMCC Centre for the Study of Disability Prevention and Rehabilitation, University of Ontario Institute of Technology (UOIT) and Canadian Memorial Chiropractic College (CMCC), Toronto, ON, Canada;2. Graduate Education and Research Programs, Canadian Memorial Chiropractic College (CMCC), 6100 Leslie Street, Toronto, ON, M2H 3J1, Canada;3. School of Public Health, University of Alberta, 4075 RTF, 8308-114 Street, Edmonton, AB, T6G 2E1, Canada;4. Canada Research Chair in Disability Prevention and Rehabilitation, University of Ontario Institute of Technology (UOIT), 2000 Simcoe Street North, Oshawa, Ontario, L1H 7K4, Canada;5. Faculty of Health Sciences, University of Ontario Institute of Technology (UOIT), 2000 Simcoe Street North, Oshawa, Ontario, L1H 7K4, Canada;6. UOIT-CMCC Centre for the Study of Disability Prevention and Rehabilitation, 6100 Leslie St., Toronto, Ontario, M2H 3J1, Canada;7. Division of Undergraduate Education, Canadian Memorial Chiropractic College, 6100 Leslie St., Toronto, Ontario, M2H 3J1, Canada;8. Toronto Health Economics and Technology Assessment (THETA) Collaborative, Leslie Dan Pharmacy Building, University of Toronto, 6th Floor, Room 658, 144 College Street, Toronto, Ontario, M5S 3M2, Canada;9. Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario, M5S 3M2, Canada;10. Institute for Work and Health, 481 University Ave, Toronto, Ontario, M5G 2E9, Canada;11. Department of Orthopedic Surgery, Occupational and Industrial Orthopedic Center, NYU School of Medicine, New York University, 63 Downing Street, New York, 10014, USA |
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| Abstract: | Neuromuscular control of the scapular muscles is important in the etiology of shoulder pain. Electromyographical (EMG) biofeedback in healthy people has been shown to support a selective activation of the lower compartment of the trapezius muscle, specifically. The aim of the present paper was to investigate whether patients with Subacromial Impingement Syndrome (SIS) were able to selectively activate the individual compartments within the trapezius muscle, with and without EMG biofeedback to the same extent as healthy controls (No-SIS).Fifteen SIS and 15 No-SIS participated in the study. Sessions with and without visual biofeedback were conducted. Surface EMG was recorded from four compartments of the trapezius muscle. Selective activation was defined as activation above 12% with other muscle parts below 1.5% or activation ratio at or above 95% of the total activation. Without biofeedback significantly fewer SIS subjects than No-SIS achieved selective activation (p = 0.02–0.03).The findings of the study show that without biofeedback No-SIS had a superior scapular muscle control. However, when provided with visual EMG feedback the SIS group performed equally well as the No-SIS group. This indicated that individuals with SIS may benefit from biofeedback training to gain control of the neuromuscular function of the scapular muscle. |
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| Keywords: | Shoulder pathology Muscle imbalance Selective activation Biofeedback Scapular stability |
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