Journal
CLINICAL NEUROPHYSIOLOGY
Volume 115, Issue 4, Pages 765-773Publisher
ELSEVIER SCI IRELAND LTD
DOI: 10.1016/j.clinph.2003.11.014
Keywords
motor cortex; passive movement; plasticity; transcranial magnetic stimulation; stroke; afference
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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. (C) 2004 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.
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