Distribution of motor unit potential velocities in the biceps brachii muscle of sprinters and endurance athletes during prolonged dynamic exercises at low force levels |
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| Authors: | Ewa G. Klaver-Król Nizare R. Henriquez Sebe J. Oosterloo Peter Klaver Harm Kuipers Machiel J. Zwarts |
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| Affiliation: | 1. Department of Neurology and Clinical Neurophysiology, Ziekenhuis Groep Twente, Geerdinksweg 141, Hengelo, The Netherlands;2. Faculty of Behavioral Sciences, University of Twente, Enschede, The Netherlands;3. Children’s University Hospital, University of Zurich, Switzerland;4. Faculty of Health, Medicine and Life Sciences, University Maastricht, Maastricht, The Netherlands;5. Department of Clinical Neurophysiology, Institute of Neurology, University Medical Centre, Nijmegen, The Netherlands;6. Epilepsiecentrum Kempenhaeghe, Heeze, The Netherlands;1. Department of Biology, National University of Ireland, Maynooth, Kildare, Ireland;2. Department of Physiology II, University of Bonn, D-53115 Bonn, Germany;1. Department of Physics and Astronomy, University of Catania, Via S. Sofia 64, I-95125 Catania, Italy;2. INFN – Laboratori Nazionali del Sud, Via S. Sofia 62, I-95123 Catania, Italy;1. University of Nantes, Faculty of Sport Sciences, Laboratory Motricité, Interactions, Performance, EA 4334, Nantes, France;2. French National Institute of Sport (INSEP), Research Department, Laboratory Sport, Expertise and Performance, Paris, France;1. Aix-Marseille Université, CNRS, ISM, UMR 7287, 13288 Marseille Cedex 09, France;2. IfADo, Leibniz Research Centre for Working Environment and Human Factors, Dortmund, Germany;1. University of Belgrade, Department of Neurobiology, Institute for Biological Research – Sinisa Stankovic, 11 060 Belgrade, Serbia;2. University of Belgrade, Department for Life Sciences, Institute for Multidisciplinary Research, 11 030 Belgrade, Serbia;1. Department of Clinical and Experimental Sciences, Research Centre for Neuromuscular Function and Adapted Physical Activity “Teresa Camplani”, Università degli Studi di Brescia, Brescia, Italy;2. Centre of Precision Rehabilitation for Spinal Pain (CPR Spine), School of Sport, Exercise and Rehabilitation Sciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK;3. School of Sport and Exercise Sciences, Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy |
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| Abstract: | In surface electromyography (sEMG), the distribution of motor unit potential (MUP) velocities has been shown to reflect the proportion of faster and slower propagating MUPs. This study investigated whether the distribution of MUP velocities could distinguish between sprinters (n = 11) and endurance athletes (n = 12) in not-specifically trained muscle (biceps brachii) during prolonged dynamic exercises at low forces. sEMG was acquired during 4 min’ exercises: unloaded, 5%, 10% and 20% of maximal voluntary contraction (MVC). The features extracted from the sEMG were: the mean muscle conduction velocity – estimated using the inter-peak latency and cross-correlation methods, the within-subject skewness (expressing the proportions of faster and slower propagating MUPs) and the within-subject standard deviation of MUP velocities (SD-mup). Sprinters showed a greater proportion of faster propagating MUPs than endurance athletes. During fatigue, the SD-mup of sprinters broadened progressively, whereas that of endurance athletes did not. The findings suggest that sprinters conveyed a greater proportion of faster motor units than endurance athletes and that motor unit behavior during fatigue differed between groups. Thus, the distribution of MUP velocities enables distinction between a muscle of sprinters and endurance athletes during prolonged dynamic exercises at low forces. |
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