Between-day reliability of a hand-held dynamometer and surface electromyography recordings during isometric submaximal contractions in different shoulder positions |
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| Institution: | 1. Physical Activity and Human Performance Group, Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark;2. Department of Occupational and Physical Therapy, Regional Hospital Central Jutland, Viborg, Denmark;3. Department of Occupational and Physical Therapy, Aalborg University Hospital, Aalborg, Denmark;1. Department of Orthopedic Surgery, Graduate School of Medicine, Chiba University, Chiba, Japan;2. Shoulder and Elbow Center, Funabashi Orthopedic Hospital, Chiba, Japan;3. Department of Orthopedic Surgery, Chiba Medical Center, Chiba, Japan;4. Department of Orthopedic Surgery, Kitasato University, Kanagawa, Japan;5. Department of Radiology, Chiba University, Chiba, Japan;6. Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA;1. Department of Pharmacy & Applied Science, College of Science Health & Engineering, La Trobe University, Bendigo, Victoria, Australia;2. School of Allied Health, La Trobe University, Victoria, Australia;3. St. John of God Hospital, Bendigo, Victoria, Australia;1. School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia;2. Worcester Polytechnic Institute, Worcester, MA, USA;3. Department of Human Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam Movement Sciences, Amsterdam, the Netherlands;4. Faculty of Sport Sciences, Laboratory “Movement, Interactions, Performance” (EA 4334), University of Nantes, Nantes, France;5. Institut Universitaire de France (IUF), Paris, France;6. School of Electrical and Electronic Engineering, University College Dublin, Dublin, Ireland;7. LISiN, Department of Electronics and Telecommunications, Politecnico di Torino, Torino, Italy;8. Department of Clinical Research and Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark;9. Centre for Health, Exercise and Sports Medicine, Department of Physiotherapy, University of Melbourne, Parkville, Australia;10. Auckland Bioengineering Institute and Department of Engineering Science, University of Auckland, Auckland, New Zealand;11. Trinity College Institute of Neuroscience, School of Psychology, Trinity College Dublin, Dublin, Ireland;12. School of Psychology, Queen’s University Belfast, Belfast, UK;13. School of Human Movement and Nutrition Sciences, The University of Queensland, Australia;14. Department of Rehabilitation and Prevention Engineering, Institute of Applied Medical Engineering, RWTH Aachen University, Aachen, Germany;15. Department of Integrative Physiology, University of Colorado Boulder, CO, USA;p. Centre of Precision Rehabilitation for Spinal Pain (CPR Spine), School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, UK;q. Department of Bioengineering, Imperial College London, London, UK;r. Neuroscience Research Australia, University of New South Wales, Sydney, Australia;s. Faculty of Electrical Engineering and Computer Science, University of Maribor, Koro?ka cesta 46, Maribor, Slovenia;t. Brain and Mind Centre, University of Sydney, Sydney, Australia;u. Department of Neurology, Royal Prince Alfred Hospital, Sydney, Australia;v. US Department of Veterans Affairs, USA;w. Northwestern University, Evanston, IL, USA;x. Shirley Ryan AbilityLab, Chicago, IL, USA;y. Sobell Department of Motor Neuroscience and Movement Disorders, UCL Institute of Neurology, London, UK;z. School of Biomedical Sciences, The University of Queensland, Brisbane, Australia;1. Laboratory of Biomechanics and Clinical Epidemiology, Universidade Estadual de Londrina, Londrina, Brazil;2. Faculdade Interamericana de Porto Velho, Porto Velho, Brazil;3. University of Central Lancashire, Preston, United Kingdom;4. Universidade Tiradentes, Aracaju, Brazil;5. Sports Science Department, Universidade Estadual de Londrina, Londrina, Brazil;6. Electrical Engineering Department, Universidade Estadual de Londrina, Londrina, Brazil;7. Physical Therapy, Movement and Rehabilitation Sciences Department, Northeastern University, Boston, USA;8. Coordinator of the Laboratory of Biomechanics and Clinical Epidemiology, Universidade Estadual de Londrina, Londrina, Brazil;1. Department of Physical Therapies, Australian Institute of Sport, Australia;2. Discipline of Biomedical Science, Sydney Medical School, University of Sydney, Australia;3. Discipline of Exercise & Sports Science, Faculty of Health Sciences, University of Sydney, Australia |
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| Abstract: | Functional shoulder assessments require the use of objective and reliable standardized outcome measures. Therefore, the aim of this study was to examine the between-day reliability of a hand-held dynamometer when measuring muscle strength during flexion, abduction, and internal and external rotation as well as surface electromyography (EMG) when measuring muscle activity from m. trapezius superior and deltoideus anterior. Twenty-four healthy subjects participated and performed four isometric contractions measured with a hand-held dynamometer and EMG. Both relative and absolute reliability were calculated based on the mean of the last three of the four repetitions. EMG amplitude was assessed calculating both absolute and normalized root-mean-square (RMS) values. The reliability of the hand-held dynamometer was high (LOA = 3.2–7.6% and ICC = 0.89–0.98). The absolute reliability for EMG showed similar results for absolute RMS values (LOA = 20.0–68.4%) and normalized RMS values (LOA = 42.4–66.5%). However, the results concerning the relative reliability showed higher ICC for absolute RMS values (ICC = 0.82–0.92) compared with normalized values (ICC = 0.57–0.72).The outcome measurements of this study with healthy subjects were found reliable and, therefore, have the potential to detect changes in muscle strength and muscle activity. |
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| Keywords: | Absolute reliability Relative reliability m Deltoideus anterior m Trapezius superior Outcome measurements |
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