F Tyč1, A Boyadjian. 1. Laboratoire Plasticité et Physio-Pathologie de la Motricité, UMR 6196, CNRS, 31 Chemin J. Aiguier, 13402 Marseille Cedex 20, France. tycfr@free.fr
Abstract
OBJECTIVE: To study the modifications induced by training of a coordinated movement on the primary motor cortex (M1) maps of one proximal muscle and one distal muscle activated alone and during their co-contraction. METHODS: Six healthy female sport students performed a 6-week training program during which they were trained in darts 3-4 times a week. At the end each subject had made more than 1200 throws. Transcranial magnetic stimulation (TMS) was used to map the proximal medial deltoid (MD) and the distal brachio-radialis (BR) muscle representations on M1. Motor evoked potentials (MEPs) amplitude and excitability curves were used to test corticomotor excitability. RESULTS: The cortical representation areas of each muscle separately increased after training. The cortical representation and the excitability curve of the BR muscle increased during co-activation with the MD. Combining co-contraction and training produced a further enlargement of the M1 representation of the BR muscle. CONCLUSIONS: The enlargement of the BR representation in M1 suggests the development of overlapping zones specifying functional synergies between distal and proximal muscles. SIGNIFICANCE: Our findings support the idea that training of a coordinated movement involving several muscles and joints requires an activity-dependent coupling of cortical networks.
OBJECTIVE: To study the modifications induced by training of a coordinated movement on the primary motor cortex (M1) maps of one proximal muscle and one distal muscle activated alone and during their co-contraction. METHODS: Six healthy female sport students performed a 6-week training program during which they were trained in darts 3-4 times a week. At the end each subject had made more than 1200 throws. Transcranial magnetic stimulation (TMS) was used to map the proximal medial deltoid (MD) and the distal brachio-radialis (BR) muscle representations on M1. Motor evoked potentials (MEPs) amplitude and excitability curves were used to test corticomotor excitability. RESULTS: The cortical representation areas of each muscle separately increased after training. The cortical representation and the excitability curve of the BR muscle increased during co-activation with the MD. Combining co-contraction and training produced a further enlargement of the M1 representation of the BR muscle. CONCLUSIONS: The enlargement of the BR representation in M1 suggests the development of overlapping zones specifying functional synergies between distal and proximal muscles. SIGNIFICANCE: Our findings support the idea that training of a coordinated movement involving several muscles and joints requires an activity-dependent coupling of cortical networks.
Authors: Hugo Massé-Alarie; Michael J G Bergin; Cyril Schneider; Siobhan Schabrun; Paul W Hodges Journal: Hum Brain Mapp Date: 2017-09-17 Impact factor: 5.038
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Authors: Ela B Plow; Nicole Varnerin; David A Cunningham; Daniel Janini; Corin Bonnett; Alexandria Wyant; Juliet Hou; Vlodek Siemionow; Xiao-Feng Wang; Andre G Machado; Guang H Yue Journal: PLoS One Date: 2014-02-21 Impact factor: 3.240