The vastus lateralis neuromuscular activity during all-out cycling exercise |
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| Authors: | Stephane Renaud Philippe Jean-Francois Jean-Claude Anne-Marie Olivier |
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| Affiliation: | 1. Laboratoire Activité Motrice et Conception ergOnomique, Faculté du Sport et de l’Éducation Physique, Université d’Orléans, 2 Allée du Château B.P. 6237, 45062 Orléans Cedex, France;2. Laboratoire d’Electronique Signaux et Images, Polytech’Orléans, Orléans, France;3. Laboratoire de Physiologie, Faculté de Médecine Pitié Salpêtrière, Paris, France;4. Institut de Médecine Aéronautique du Service de la Santé des Armées, Brétigny, France;5. Centre Hospitalier Régional d’Orléans, Unité de Physiopathologie de l’Exercice, France;1. Biomechanics and Sports Engineering Groups, Biomedical Engineering Department, Amirkabir University of Technology, Tehran, Iran;2. Centre for Sports Engineering Research, Sheffield Hallam University, A217, Collegiate Hall, Collegiate Crescent, Sheffield S10 2BP, UK;3. FiDiPro Programme, University of Jyväskylä, Finland;1. Univ Lyon, UJM-Saint-Etienne, Laboratoire Interuniversitaire de Biologie de la Motricité, EA 7424, F-42023 Saint-Etienne, France;2. Université du Maine, Laboratoire ?Motricité, Interaction, Performance? EA4334, UFR Sciences et Technique, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France;1. Skeletal Muscle Structure and Function, Laboratory of Scientific Research, Department of Biomechanics, Medicine and Rehabilitation of the Locomotor Apparatus, Faculty of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil;2. Department of Social Medicine, Faculty of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil |
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| Abstract: | ![]()
ObjectiveThe objective of this work was to study modifications in motor control through surface electromyographic (sEMG) activity during a very short all-out cycling exercise.MethodsTwelve male cyclists (age 23 ± 4 years) participated in this study. After a warm-up period, each subject performed three all-out cycling exercises of 6 s separated by 2 min of complete rest. This protocol was repeated three times with a minimum of 2 days between each session. The braking torque imposed on cycling motion was 19 N m. The sEMG of the vastus lateralis was recorded during the first seven contractions of the sprint. Time–frequency analysis of sEMG was performed using continuous wavelet transform. The mean power frequency (MPF, qualitative modifications in the recruitment of motor units) and signal energy (a quantitative indicator of modifications in the motor units recruitment) were computed for the frequency range 10–500 Hz.ResultssEMG energy increased (P ? 0.05) between contraction number 1 and 2, decreased (P ? 0.05) between contraction number 2 and 3 then stabilized between contraction number 3 and 7 during the all-out test. MPF increased (P ? 0.05) during the all-out test. This increase was more marked during the first two contractions.ConclusionsThe decrease in energy and the increase in the sEMG MPF suggest a large spatial recruitment of motor units (MUs) at the beginning of the sprint followed by a preferential recruitment of faster MUs at the end of the sprint, respectively. |
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| Keywords: | Electromyography Cycling Muscle Maximal velocity |
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