The coordination of shoulder girdle muscles during repetitive arm movements at either slow or fast pace among women with or without neck-shoulder pain |
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| Affiliation: | 1. Laboratory of Clinical and Occupational Kinesiology (LACO), Department of Physical Therapy, Federal University of São Carlos, São Carlos, São Paulo, Brazil;2. Laboratory for Ergonomics and Work-related Disorders, Physical Activity and Human Performance Group – SMI, Department of Health Science and Technology, Aalborg University, Aalborg East, Denmark;1. Graduate program in Rehabilitation Science, University of British Columbia, Vancouver, Canada;2. Laboratorio di Ingegneria del Sistema Neuromuscolare (LISiN), Dipartimento di Elettronica e Telecomunicazioni, Politecnico di Torino, Italy;3. Escola de Educação Física e Desportos, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil;4. Department of Physical Therapy, University of British Columbia, Vancouver, Canada;1. Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada;2. School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, Ottawa, ON, Canada;1. Centre of Precision Rehabilitation for Spinal Pain (CPR Spine), School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, UK;2. Physical Therapy Department, College of Medical Rehabilitation, Qassim University, Buraidah, Saudi Arabia;3. Rehabilitation Research Laboratory 2rLab, Department of Business Economics, Health and Social Care, University of Applied Sciences and Arts of Southern Switzerland, Manno/Landquart, Switzerland;1. School of Biomedical Sciences, University of Edinburgh, Edinburgh EH8 9XD, UK;1. Danish Pain Research Center, Aarhus University Hospital, Aarhus, Denmark;2. Department of Neurology, Aarhus University Hospital, Aarhus, Denmark;3. Department of Clinical Neurophysiology, Aarhus University Hospital, Aarhus, Denmark;4. Clinical Oral Physiology, Department of Dentistry and Department of Oral Maxillofacial Surgery, Aarhus University, Aarhus, Denmark |
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| Abstract: | Purpose: The aim of this study was to evaluate the coordination of the shoulder girdle muscles among subjects with or without neck-shoulder pain performing repetitive arm movement at either a slow or fast pace. Methods: Thirty female adults were allocated to one of two groups—healthy controls or cases with neck-shoulder pain. Surface electromyography (sEMG) signals from the clavicular, acromial, middle and lower trapezius portions and the serratus anterior muscles were recorded during a task performed for 20 min at a slow pace and 20 min at a fast pace. The root mean square (RMS), relative rest time (RRT) and normalised mutual information (NMI, an index of functional connectivity between two muscles in a pair) were computed. Results: No significant differences on RMS, RRT and NMI were found between groups. For both groups, the fast movement pace resulted in increased levels of RMS, lower degrees of RRT and higher NMI compared to the slow pace. No interaction between group and movement pace was found. Conclusions: This study highlights the change in sEMG activity of muscles to meet the demands of performing a task at fast movement pace. The fast pace imposed a higher muscle demand evidenced by increased sEMG amplitude, low degree of muscle rest and increased functional connectivity for subjects in both the case and control groups. No indication of impaired sEMG activity was found in individuals with neck-shoulder pain. |
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| Keywords: | Surface electromyography Shoulder girdle Repetitive work Functional connectivity |
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