Reduced cortical voluntary activation during bilateral knee extension期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Reduced cortical voluntary activation during bilateral knee extension

Affiliation:	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. Service de neurologie, CMRR, CHU Pontchaillou, Rennes, France;2. Normandie Univ, UNICAEN, PSL Research University, EPHE, INSERM, U1077, CHU de Caen, Neuropsychologie et Imagerie de la Mémoire Humaine, 14000 Caen, France;3. University of Rennes 1, Faculté de Médecine, Rennes F-35065, France;4. Inria, Rennes Research Center, Rennes F-35042, France;5. Inserm, U1228, ERL VISAGES, Rennes F-35042, France;6. CNRS, UMR 6074, IRISA, Rennes F-35042, France;7. CHU Rennes, Neuroradiology Dept, Rennes F-35033, France;8. Service de Radiologie, CHU Pontchaillou, Rennes, France;1. Department of orthopaedic surgery, hôpital d’instruction des armées Desgenettes, 108, boulevard Pinel, 69275 Lyon cedex 03, France;2. Department of neurology, hôpital d’instruction des armées Desgenettes, 108, boulevard Pinel, 69275 Lyon cedex 03, France;3. Department of radiology, hôpital d’instruction des armées Desgenettes, 108, boulevard Pinel, 69275 Lyon cedex 03, France;1. Department of Physiotherapy, Faculty of Rehabilitation, Tabriz University of Medical Sciences, Tabriz, Iran;2. Department of Physiotherapy, School of Rehabilitation, Shahid Beheshti University of Medical Sciences, Tehran, Iran;3. Department of Basic Sciences, School of Rehabilitation, Shahid Beheshti University of Medical Sciences, Tehran, Iran;1. Department of Epilepsy, Movement Disorders and Physiology, Kyoto University Graduate School of Medicine, 54 Kawahara-Cho, Shogoin, Sakyo-Ku, Kyoto 606-8507, Japan;2. Research and Educational Unit of Leaders for Integrated Medical System, 54 Shogoin-Kawahara-Cho, Sakyo-Ku, Kyoto 606-8507, Japan;3. Department of Neurology, Kyoto University Graduate School of Medicine, 54 Shogoin-Kawahara-Cho, Sakyo-Ku, Kyoto 606-8507, Japan;4. Department of Human Brain Research Center, Kyoto University Graduate School of Medicine, 54 Shogoin-Kawahara-Cho, Sakyo-Ku, Kyoto 606-8507, Japan;5. Department of Respiratory Care and Sleep Control Medicine, Kyoto University Graduate School of Medicine, 54 Kawahara-Cho, Shogoin, Sakyo-Ku, Kyoto 606-8507, Japan

Abstract:	IntroductionReduced neural drive is mainly thought to explain the bilateral deficit phenomenon, i.e. the difference in maximal isometric voluntary contraction (MVC) between unilateral and bilateral contractions. The aim of the present study was to further document if bilateral knee extension is associated with changes in voluntary activation level assessed by both peripheral nerve electrical stimulation and transcranial magnetic stimulation.MethodsFourteen subjects performed unilateral and bilateral knee extensions with both superimposed femoral electrical nerve stimulation and transcranial magnetic stimulation in order to assess voluntary activation (VA_FNES) and cortical voluntary activation (VA_TMS), respectively.ResultsThere was no difference in MVC force of the tested leg when involved in unilateral and bilateral knee extensions (p = 0.87). However, a significantly reduced VA_FNES (−2.1 ± 2.4%; p = 0.01) and VA_TMS (−1.6 ± 2.7%; p = 0.04) have been evidenced during bilateral knee extension.DiscussionIt is hypothesized that counterbalances could have masked the decrease of voluntary activation during bilateral contraction.

Keywords:	Bilateral deficit Voluntary activation Transcranial magnetic stimulation Femoral nerve electrical stimulation Knee extension Antagonist co-activation
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