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The interaction between metaplastic neuromodulation and fatigue in multiple sclerosis

Published:December 11, 2022DOI:https://doi.org/10.1016/j.jns.2022.120521

      Highlights

      • There is evidence for metaplasticity improving functional outcomes, but this remains unexplored during neuromuscular fatigue in people with MS
      • Corticospinal excitability during fatigue is unchanged with priming Transcranial Direct Current Stimulation in people with Multiple Sclerosis
      • Metaplasticity is possibly impaired in people with Multiple Sclerosis

      Abstract

      Background and objective

      Neuromuscular fatigue contributes to decrements in quality of life in Multiple Sclerosis (MS), yet available treatments demonstrate limited efficacy. Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique which presents promise in managing fatigue, possibly related to its capacity to modulate corticospinal excitability. There is evidence for capitalising on metaplasticity using tDCS for improving outcomes. However, this remains to be explored with fatigue in people with MS (pwMS). We investigated cathodal tDCS (ctDCS) priming on anodal tDCS (atDCS)-induced corticospinal excitability and fatigue modulation in pwMS.

      Methods

      15 pwMS and 15 healthy controls completed fatiguing exercise whilst receiving either ctDCS or sham (stDCS) primed atDCS to the motor cortex. We assessed change in contraction force and motor evoked potential (MEP) amplitude across time to represent changes in fatigue and corticospinal excitability.

      Results and conclusion

      ctDCS primed atDCS induced MEP elevation in healthy participants but not in pwMS, possibly indicating impaired metaplasticity in pwMS. No tDCS-mediated change in the magnitude of fatigue was observed, implying that development of fatigue may not rely on changes in corticospinal excitability.

      Significance

      These findings expand understanding of tDCS effects in pwMS, highlighting differences that may be relevant in the disease pathophysiology.

      Keywords

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