Sub-regional activation of supraspinatus and infraspinatus muscles during activities of daily living is task dependent |
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| Institution: | 1. Department of Kinesiology, University of Waterloo, Waterloo, ON, Canada;2. University of Saskatchewan, College of Medicine, School of Rehabilitation Science, Saskatoon, Saskatchewan, Canada;1. Graduate School of Sport Sciences, Waseda University, Saitama, Japan;2. Faculty of Sport Sciences, Waseda University, Saitama, Japan;3. Faculty of Health & Medical Care, Saitama Medical University, Saitama, 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. Department of Physical Therapy, College of Pharmacy and Health Sciences, Mercer University, 3001 Mercer University Drive, Atlanta, GA 30341-4155, USA;2. Department of Physical Therapy, Duquesne University, Pittsburgh, PA, USA;1. Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA;2. Carl J. Shapiro Department of Orthopaedic Surgery, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA;3. Department of Orthopaedic Surgery, Yerevan State Medical University, Yerevan, Armenia;4. Department of Mechanical Engineering, Boston University, Boston, MA, USA;1. Department of Biomedical Engineering, Northwestern University, McCormick School of Engineering, Evanston, IL, USA;2. Shirley Ryan AbilityLab, Chicago, IL, USA;3. Department of Physical Therapy and Human Movement Sciences, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA;4. Feinberg School of Medicine, Northwestern University, Chicago, IL, USA;5. Department of Physical Medicine and Rehabilitation, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA;1. School of Rehabilitation, Université de Montréal, Montreal, Canada;2. Centre for Interdisciplinary Research in Rehabilitation of Greater Montreal (CRIR), Institut universitaire sur la réadaptation en déficience physique de Montréal (IURDPM), CIUSSS du Centre-Sud-de-l''Ile-de-Montréal, Montreal, Canada |
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| Abstract: | The supraspinatus and infraspinatus muscles each have multiple sub-regions that may activate differentially in activities of daily living. Awareness of these differential demands critically informs rehabilitation of rotator cuff muscle following injury, particularly if centered on recovering and strengthening the rotator cuff to perform daily tasks. This study quantified muscle activation of supraspinatus and infraspinatus sub-regions during the performance of six activities of daily living. Twenty-three participants (mean: 22.6 ± 2.6 years) completed the following tasks: opening a jar, reaching at shoulder height, overhead reaching, pouring water from a pitcher, eating with a spoon, and combing hair. Indwelling electromyography was collected from the anterior and posterior supraspinatus and superior, middle, and inferior infraspinatus. Tasks requiring high arm elevations (e.g. reaching at shoulder and overhead height) activated anterior supraspinatus between 21 and 28% MVC. The posterior supraspinatus consistently activated between 10 and 30% MVC across all tasks. All sub-regions of infraspinatus activated highly (between 18 and 25% MVC) in tasks requiring high arm elevations in flexion. These findings may be leveraged to define effective measures to increase rotator cuff function in daily tasks. |
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| Keywords: | Fine wire electromyography Rotator cuff Functional tasks Shoulder Daily tasks |
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