Effect of different approaches to target force on transcranial magnetic stimulation responses

Mathieu Gruet, John Temesi, Thomas Rupp, Guillaume Y. Millet, Samuel Verges*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Introduction: The aim of this study was to determine whether the manner in which a target force is approached can influence the electromyographic (EMG) and mechanical parameters evoked by transcranial magnetic stimulation (TMS) during brief muscle contractions. Methods: The amplitude of motor-evoked potentials (MEP) and superimposed twitch and the duration of the silent period were recorded in 8 healthy participants in response to TMS delivered during brief isometric voluntary contractions of the quadriceps maintaining a target force (10% and 50% of maximal voluntary force) or gradually increasing or decreasing to reach this point. Results: MEP and superimposed twitch, unlike the silent period, are influenced by the manner of reaching a low force. Conclusions: Clear instructions must be provided to research participants and patients. Rapidly increasing to a target force without exceeding it and maintaining the force before the delivery of TMS results in stable, representative MEP amplitudes.

Original languageEnglish
Pages (from-to)430-432
Number of pages3
JournalMuscle and Nerve
Issue number3
Publication statusPublished - Sept 2013
Externally publishedYes


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