Associations between cervical and scapular posture and the spatial distribution of trapezius muscle activity |
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| Institution: | 1. School and Graduate Institute of Physical Therapy, College of Medicine, National Taiwan University, Taipei, Taiwan, ROC;2. Department of Physical Medicine & Rehabilitation, Chang Gung Memorial Hospital at Linkou and College of Medicine, Chang Gung University, Taoyuan, Taiwan, ROC;3. Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;4. Department of Physical Therapy, College of Medicine, National Cheng Kung University, Taiwan, ROC;5. Graduate Institute of Biomedical Engineering, National Chung Hsing University, Taichung, Taiwan, ROC;6. School of Physical Therapy and Graduate Institute of Rehabilitation Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan, ROC;7. Bone and Joint Research Center, Chang Gung Memorial Hospital, Linkou, Taoyuan, Taiwan, ROC;8. Department of Orthopaedic Surgery, Chang Gung Memorial Hospital, Linkou, Taiwan, ROC;1. Basic Sciences Department, Faculty of Physical Therapy, Pharos University in Alexandria, Egypt;2. Basic Sciences Department, Faculty of Physical Therapy, Cairo University, Egypt;3. Physiotherapy Department, College of Applied Medical Sciences, Umm Al-Qura University, Saudi Arabia;4. Dean, Faculty of physical therapy, Suez University, Egypt;5. Department of Orthopedics, Ahmed Maher Teaching Hospital, Egypt;6. Department of Musculoskeletal Disorders and Their Surgery, Faculty of Physical Therapy, Delta University for Science and Technology, Egypt |
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| Abstract: | The first aim of this investigation was to quantify the distribution of trapezius muscle activity with different scapular postures while seated. The second aim of this investigation was to examine the association between changes in cervical and scapular posture when attempting to recruit different subdivisions of the trapezius muscle. Cervical posture, scapular posture, and trapezius muscle activity were recorded from 20 healthy participants during three directed shoulder postures. Planar angles formed by reflective markers placed on the acromion process, C7, and tragus were used to quantify cervical and scapular posture. Distribution of trapezius muscle activity was recorded using two high-density surface electromyography (HDsEMG) electrodes positioned over the upper, middle, and lower trapezius. Results validated the assumption that directed scapular postures preferentially activate different subdivisions of the trapezius muscle. In particular, scapular depression was associated with a more inferior location of trapezius muscle activity (r = 0.53). Scapular elevation was coupled with scapular abduction (r = 0.52). Scapular adduction was coupled with cervical extension (r = 0.35); all other changes in cervical posture were independent of changes in scapular posture. This investigation provides empirical support for reductions in static loading of the upper trapezius and improvements in neck posture through verbal cueing of scapular posture. |
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| Keywords: | High-density EMG Trapezius muscle Cervical posture Scapular posture |
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