The effect of transcranial direct current stimulation on perception of effort in an isolated isometric elbow flexion task

Sofia I. Lampropoulou, Alexander V. Nowicky

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The purported ergogenic actions of transcranial direct current stimulation (tDCS) applied to motor cortex (M1) on force production and perception of effort were investigated using a 10-item numerical rating scale (0-10 NRS) in nonfatiguing bouts of a force-matching task utilizing isometric elbow flexion. Using a crossover design, 12 healthy volunteers received sham, anodal, and cathodal tDCS randomly for 10 min (1.5 mA, 62 ìA/cm2) to the left M1 in a double-blind manner. Corticospinal excitability changes were also monitored using transcranial magnetic stimulation (TMS) with surface electromyography (sEMG) to monitor both motor evoked potentials (MEPs) and force-EMG from right m. biceps brachii and m. brachioradialis brachii. Néo significant differences between the verum and sham stimulation were obtained for elbow flexion maximum voluntary force, perception of effort, or sEMG. There were also no significant differences in MEP changes for the types of tDCS, which is consistent with reports that tDCS excitability effects are diminished during ongoing cognitive and motor activities.

Original languageEnglish
Pages (from-to)412-426
Number of pages15
JournalMotor Control
Volume17
Issue number4
Publication statusPublished - Oct 2013

Keywords

  • 0-10 NRS effort rating
  • Elbow flexors
  • Ergogenic action
  • MEPs
  • Perception of effort
  • Sensorimotor cortex
  • tDCS
  • TMS

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