Muscle activity during maximal isometric forearm rotation using a power grip |
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| Institution: | 1. Orthopaedic Biomechanics Laboratory, Center for Biomedical Engineering, University of Kentucky, Lexington, KY, United States;2. Department of Orthopaedic Surgery, University of Kentucky Medical Center, Lexington, KY, United States;3. Hand Institute, Auckland, New Zealand;4. Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand;5. Department of Rehabilitation Sciences, University of Kentucky, Lexington, KY, United States;1. Instituto de Telecomunicações, Instituto Superior Técnico, UL, Portugal;2. Instituto de Telecomunicações, Universidade de Évora, Portugal;1. Department of Cardiology, Angiology and Intensive Care, St. Marien-Krankenhaus Siegen gGmbH, Siegen, Germany;2. Department of General, Visceral and Vascular Surgery, St. Marien-Krankenhaus Siegen gGmbH, Siegen, Germany;1. Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, BC, Canada;2. Concord Field Station, Harvard University, Bedford, MA, USA;3. School of Biomedical Sciences, University of Queensland, St Lucia, Queensland, Australia;1. Department of Orthopedic Surgery, University of the Ryukyus, Graduate School of Medicine, Okinawa, Japan;2. Rehabilitation Unit, Ryukyu University Hospital. Okinawa, Japan;3. Tominaga-Kusano Hospital, Sanjo, Niigata, Japan;1. Department of Rehabilitation Medicine, Leiden University Medical Center, Albinusdreef 2, 2300 RC Leiden, The Netherlands;2. Department of Biomechanical Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands;3. Faculty of Technology, Innovation & Society, The Hague University of Applied Sciences, Johanna Westerdijkplein 75, 2521 EN The Hague, The Netherlands;4. Department of Rehabilitation Medicine, VU Medical Center, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands |
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| Abstract: | This study aimed to provide quantitative activation data for muscles of the forearm during pronation and supination while using a power grip. Electromyographic data was collected from 15 forearm muscles in 11 subjects while they performed maximal isometric pronating and supinating efforts in nine positions of forearm rotation. Biceps brachii was the only muscle with substantial activation in only one effort direction. It was significantly more active when supinating (µ = 52.1%, SD = 17.5%) than pronating (µ = 5.1%, SD = 4.8%, p < .001). All other muscles showed considerable muscle activity during both pronation and supination. Brachioradialis, flexor carpi radialis, palmaris longus, pronator quadratus and pronator teres were significantly more active when pronating the forearm. Abductor pollicis longus and biceps brachii were significantly more active when supinating. This data highlights the importance of including muscles additional to the primary forearm rotators in a biomechanical analysis of forearm rotation. Doing so will further our understanding of forearm function and lead to the improved treatment of forearm fractures, trauma-induced muscle dysfunction and joint replacements. |
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| Keywords: | Activation Electromyography Forearm Muscle Pronation Supination |
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