Impact of the contraction of medial forearm muscles during grip tasks in different forearm positions on medial support at the elbow joint |
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| Affiliation: | 1. Graduate School of Health and Welfare, Niigata University of Health and Welfare, Niigata, Japan;2. Tominaga Kusano Hospital, Niigata, Japan;3. Niigata Hand Surgery Foundation, Niigata, Japan;1. Centre of Precision Rehabilitation for Spinal Pain (CPR Spine), School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, UK;2. Department of Integrative Physiology, University of Colorado Boulder, CO, USA;3. Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroška cesta 46, Maribor, Slovenia;4. US Department of Veterans Affairs, USA;5. Department of Bioengineering, Imperial College London, London, UK;6. School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia;7. School of Biomedical Sciences, The University of Queensland, Brisbane, Australia;8. LAMHESS, Université Côte d’Azur, Nice, France;9. Institut Universitaire de France (IUF), Paris, France;10. Trinity College Institute of Neuroscience and School of Psychology, Trinity College Dublin, Dublin, Ireland;11. School of Psychology, Queen’s University Belfast, Belfast, UK;12. School of Human Movement and Nutrition Sciences, The University of Queensland, Brisbane, Australia;13. Worcester Polytechnic Institute, Worcester, MA, USA;14. Department of Rehabilitation and Prevention Engineering, Institute of Applied Medical Engineering, RWTH Aachen University, Aachen, Germany;15. Department of Human Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam Movement Sciences, Amsterdam, the Netherlands;p. Neuroscience Research Australia, University of New South Wales, Sydney, Australia;q. School of Electrical and Electronic Engineering, University College Dublin, Belfield, Dublin, Ireland;r. Department of Clinical Research and Department of Sports Sciences and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark;s. Auckland Bioengineering Institute and Department of Engineering Science, University of Auckland, Auckland, New Zealand;t. LISiN, Department of Electronics and Telecommunications, Politecnico di Torino, Torino, Italy;u. Brain and Mind Centre, University of Sydney, Sydney, Australia Department of Neurology, Royal Prince Alfred Hospital, Sydney, Australia;v. Sobell Department of Motor Neuroscience and Movement Disorders, UCL Institute of Neurology, London, UK;w. Northwestern University, Evanston, IL, USA;x. Shirley Ryan AbilityLab, Chicago, IL, USA;1. Worcester Polytechnic Institute, Worcester, MA, USA;2. Liberating Technologies, Inc., Holliston, MA, USA;1. Faculty of Sport Sciences, Sivas Cumhuriyet University, Sivas, Turkey;2. Department of Integrative Physiology, University of Colorado, Boulder, CO, USA;3. Faculty of Sport Sciences, Eskisehir Technical University, Eskisehir, Turkey;4. Faculty of Sport Sciences, Kocaeli University, Kocaeli, Turkey;5. MOTION Science Institute, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA;1. Istanbul Physical Therapy Rehabilitation Training and Research Hospital, Istanbul, Turkey;2. Istanbul Gelisim University, Faculty of Dentistry, Physiology Dept., Istanbul, Turkey;3. Istanbul Gelisim University, Faculty of Engineering and Architecture, Electric and Electronics Dep. Istanbul, Turkey;4. Cambridge Electronic Design Ltd. Technical Centre, Cambridge, England;5. Science Academy, Istanbul, Turkey;1. Department of Mechanical Engineering, Colorado School of Mines, United States;2. Warfighter Performance Department, Naval Health Research Center, United States;3. Military and Veterans Health Solutions, Leidos, Inc, United States;4. Quantitative Biosciences and Engineering Program, Colorado School of Mines, United States;1. Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, Bolu Abant Izzet Baysal University, Bolu, Turkey;2. Faculty of Physiotherapy and Rehabilitation, Hacettepe University, Ankara, Turkey;3. Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, Tokat Gaziosmanpasa University, Tokat, Turkey |
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| Abstract: | We measured the medial joint distance (MJD), activity of muscles involved in medial elbow-joint support, and grip strength, aiming to examine the supportfunction of muscles.MJD was measured in supinated and pronated positions of the forearm of 10 participants under three conditions: at rest (R), under valgus load on the elbow joint (L), and under valgus load on the elbow joint during the grip task (L-grip). Under the L-grip condition, electromyography was performed on flexor digitorum superficialis (FDS), pronator teres (PT), flexor carpi radialis (FCR), and flexor carpi ulnaris (FCU); subsequently, normalized integrated electromyograms (NIEMG) were calculated. Under the L-grip condition, MJD was shorter in the pronated position than in the supinated position (p < 0.001); however, grip strength was lower in the pronated position. NIEMG of FDS was 90% in both positions, and those of FCR and FCU were low at 10%. However, that of PT was 3.6% in the supinated position and 40.9% in the pronated position, showing higher NIEMG in the pronated position (p < 0.001). Medial support during grip tasks was higher in the pronated position probably because PT activity compensates for the decreased FDS activity. |
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| Keywords: | Medial elbow-joint support Electromyography Grip Flexor-pronator muscles Forearm position |
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