Gwyn N Lewis1, Winston D Byblow. 1. Department of Sport and Exercise Science, Human Motor Control Laboratory, University of Auckland, Auckland, New Zealand. g-lewis3@northwestern.edu
Abstract
OBJECTIVE: To determine the effects of a passive wrist movement intervention on cortical representation of forearm musculature. METHODS: Transcranial magnetic stimulation was used to map cortical representation of a forearm flexor muscle in healthy individuals and in individuals following stroke before and immediately after a 30 min session of passive wrist movement. RESULTS: In the healthy individuals, no changes in map area or map centre of gravity were noted after the intervention; however, map volume increased significantly across all subjects. In the stroke patient group there were no significant changes in any parameters following the intervention. CONCLUSIONS: It is speculated that the enlargement in map volume following the passive movement intervention arose through a heightened synaptic efficacy of the corticospinal pathway in response to the increase in afferent information. Short-term proprioceptive stimulation can induce alterations in corticomotor excitability in the target musculature. SIGNIFICANCE: These findings provide a potential neural substrate to account for alterations in motor and sensory function in stroke patients in response to long-term passive movement interventions.
OBJECTIVE: To determine the effects of a passive wrist movement intervention on cortical representation of forearm musculature. METHODS: Transcranial magnetic stimulation was used to map cortical representation of a forearm flexor muscle in healthy individuals and in individuals following stroke before and immediately after a 30 min session of passive wrist movement. RESULTS: In the healthy individuals, no changes in map area or map centre of gravity were noted after the intervention; however, map volume increased significantly across all subjects. In the strokepatient group there were no significant changes in any parameters following the intervention. CONCLUSIONS: It is speculated that the enlargement in map volume following the passive movement intervention arose through a heightened synaptic efficacy of the corticospinal pathway in response to the increase in afferent information. Short-term proprioceptive stimulation can induce alterations in corticomotor excitability in the target musculature. SIGNIFICANCE: These findings provide a potential neural substrate to account for alterations in motor and sensory function in strokepatients in response to long-term passive movement interventions.
Authors: Winston D Byblow; Cathy M Stinear; Marie-Claire Smith; Lotte Bjerre; Brian K Flaskager; Alana B McCambridge Journal: PLoS One Date: 2012-03-22 Impact factor: 3.240
Authors: Michelle N McDonnell; Susan L Hillier; George M Opie; Matthew Nowosilskyj; Miranda Haberfield; Gabrielle Todd Journal: Front Hum Neurosci Date: 2015-04-29 Impact factor: 3.169