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Postexercise facilitation of motor evoked potentials elicited by ipsilateral voluntary contraction

✍ Scribed by Joaquim P. Brasil-Neto; Valéria P. Araújo; Cláudio R. Carneiro

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
108 KB
Volume
22
Category
Article
ISSN
0148-639X

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✦ Synopsis

Motor evoked potentials (MEPs) to transcranial magnetic stimulation (TMS) increase in amplitude when obtained immediately after a period of exercise of the target muscle (postexercise facilitation). We studied postexercise facilitation of MEPs to TMS after periods of voluntary activation of either the ipsilateral or contralateral primary motor cortex (simple finger movements) or supplementary motor area (complex finger movements). Postexercise facilitation of the first dorsal interosseous MEPs occured ipsilaterally even after simple, unilateral finger movements of the dominant hand. The findings are taken to suggest transcallosal transfer of excitability from the dominant to nondominant cerebral hemisphere, perhaps related to mechanisms involved in bimanual motor coordination.

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