title: Shaping motor cortex plasticity through proprioception.
abstract: Short-term upper limb disuse induces a hemispheric unbalance between the primary motor cortices (M1s). However, it is still unclear whether these changes are mainly attributable to the absence of voluntary movements or to the reduction of proprioceptive information. The goal of this work was to investigate the role of proprioception in modulating hemispheric balance during a short-term right arm immobilization. We evaluated the 2 M1s excitability and the interhemispheric inhibition (IHI) between M1s in 3 groups of healthy subjects. Two groups received during the immobilization a proprioceptive (P-VIB, 80 Hz) and tactile (T-VIB, 30 Hz) vibration to the right hand, respectively. Another group did not receive any conditioning sensory inputs (No-VIB). We found that in the No-VIB and in the T-VIB groups immobilization induced a decrease of left M1 excitability and IHI from left to right hemisphere and an increase of right M1 excitability and IHI from right to left hemisphere. Differently, only a partial decrease in left M1 excitability, no change in right M1 excitability and in IHI was observed in the P-VIB group. Our findings demonstrate that the maintenance of dynamic proprioceptive inputs in an immobilized arm through muscle vibration can prevent the hemispheric unbalance induced by short-term limb disuse.
authors.affiliation: Department of Experimental Medicine, Section of Human Physiology and Centro Polifunzionale di Scienze Motorie.
authors.forename: Laura
authors.initials: L
authors.lastname: Avanzino
authors.affiliation: Department of Neurosciences, Ophthalmology and Genetics, University of Genoa, 16132 Genoa, Italy.
authors.forename: Elisa
authors.initials: E
authors.lastname: Pelosin
authors.affiliation: Department of Neurosciences, Ophthalmology and Genetics, University of Genoa, 16132 Genoa, Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Abbruzzese
authors.affiliation: Department of Robotics, Brain and Cognitive Sciences, Istituto Italiano di Tecnologia, 16163 Genoa, Italy and.
authors.forename: Michela
authors.initials: M
authors.lastname: Bassolino
authors.affiliation: Department of Robotics, Brain and Cognitive Sciences, Istituto Italiano di Tecnologia, 16163 Genoa, Italy and Institut Universitaire de France, INSERM, U1093, Cognition Action Plasticité sensori motrice, 21078 Dijon, France.
authors.forename: Thierry
authors.initials: T
authors.lastname: Pozzo
authors.affiliation: Department of Experimental Medicine, Section of Human Physiology and Centro Polifunzionale di Scienze Motorie.
authors.forename: Marco
authors.initials: M
authors.lastname: Bove
mesh_terms: D000328:Adult; D003337:Corpus Callosum / Q000502:physiology; D004576:Electromyography; D005260:Female; D006225:Hand / Q000502:physiology; D006801:Humans; D008297:Male; D009044:Motor Cortex / Q000502:physiology*; D009433:Neural Inhibition; D009434:Neural Pathways / Q000502:physiology; D009473:Neuronal Plasticity; D010812:Physical Stimulation; D011434:Proprioception / Q000502:physiology*; D012149:Restraint, Physical; D055698:Touch Perception / Q000502:physiology; D050781:Transcranial Magnetic Stimulation; D055815:Young Adult
keywords: interhemispheric inhibition; limb immobilization; motor cortex excitability; muscle vibration; proprioception; transcranial magnetic stimulation; use-dependent plasticity