Activation of neuromuscular sub-regions of supraspinatus and infraspinatus during common rehabilitative exercises |
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| Affiliation: | 1. Department of Rehabilitation, Kitasato University East Hospital, Sagamihara, Japan;2. Department of Orthopedic Surgery, Kitasato University School of Medicine, Sagamihara, Japan;3. Kitasato University Medical Center, Kitamoto, Japan;4. School of Allied Health Sciences, Kitasato University, Sagamihara, Japan;1. Department of Exercise Science and Physical Education, Montclair State University, 1 Normal Avenue, Montclair, NJ 07043, United States;2. Oregon Neurosurgery, 3355 Riverbend Drive, Suite 400, Springfield, OR 97477, United States;3. Department of Human Physiology, University of Oregon, 1240, Eugene, OR 97403, United States;1. Neuromuscular Research Laboratory, National Institute of Traumatology and Orthopedics (INTO), Rio de Janeiro, RJ, Brazil;2. Biomechanics Laboratory, EEFD – Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, RJ, Brazil;3. Centre for Exercise and Sports Science Research (CESSR), School of Medical and Health Sciences, Edith Cowan University, Joondalup, Australia;1. Musculoskeletal Research Unit – UIM, University Center for Assistance, Teaching and Research – CUADI, University of Gran Rosario – UGR, Rosario, Argentina;2. Department of Physical Therapy, Musculoskeletal Research Group - NIME, Federal University of Juiz de Fora, Brazil;3. Institute for Research and Development on Bioengineering and Bioinformatics (IBB), CONICET-UNER, Oro Verde, Argentina;4. Center for Neuroplasticity and Pain (CNAP), SMI®, Faculty of Medicine, Aalborg University, Aalborg, Denmark;1. Department of Kinesiology, University of Waterloo, Waterloo, Canada;2. School of Physiotherapy, University of Otago, Dunedin, New Zealand |
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| Abstract: | ‘Regional activation’ has been identified within the supraspinatus and infraspinatus. Previous EMG studies have provided insight on the different functions of the sub-regions within the supraspinatus and infraspinatus, however, to date timing of peak EMG activation has not been investigated. To assess how theses sub-regions function during commonly prescribed rehabilitation exercises, electrodes were inserted into the supraspinatus - anterior and posterior- and infraspinatus - superior and middle - of 22 healthy participants. For each sub-region, normalized EMG data - amplitude and timing - was collected from nine rehabilitation exercises - three with an elastic band and six an exercise ball. Supraspinatus posterior and infraspinatus superior had similar activation levels between elastic band exercises, but the timing of peak activation was exercise specific. In all elastic band exercises, supraspinatus posterior activated prior to supraspinatus anterior. All ball exercises elicited low-amplitude muscle activation; dynamic ball exercises had higher peak muscle activation than their static counterparts. |
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| Keywords: | Rotator cuff Electromyography Therapeutic exercise Elastic band Exercise ball Physiotherapy |
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