Preparation and execution of teeth clenching and foot muscle contraction influence on corticospinal hand-muscle excitability

Naeem Komeilipoor*, Risto J. Ilmoniemi, Kaisa Tiippana, Martti Vainio, Mikko Tiainen, Lari Vainio

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)
141 Downloads (Pure)

Abstract

Contraction of a muscle modulates not only the corticospinal excitability (CSE) of the contracting muscle but also that of different muscles. We investigated to what extent the CSE of a hand muscle is modulated during preparation and execution of teeth clenching and ipsilateral foot dorsiflexion either separately or in combination. Hand-muscle CSE was estimated based on motor evoked potentials (MEPs) elicited by transcranial magnetic stimulation (TMS) and recorded from the first dorsal interosseous (FDI) muscle. We found higher excitability during both preparation and execution of all the motor tasks than during mere observation of a fixation cross. As expected, the excitability was greater during the execution phase than the preparation one. Furthermore, both execution and preparation of combined motor tasks led to higher excitability than individual tasks. These results extend our current understanding of the neural interactions underlying simultaneous contraction of muscles in different body parts.

Original languageEnglish
Article number41249
Pages (from-to)1-9
JournalScientific Reports
Volume7
DOIs
Publication statusPublished - 24 Jan 2017
MoE publication typeA1 Journal article-refereed

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