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Electroencephalography Network Indices as Biomarkers of Upper Limb Impairment in Chronic Stroke
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Paretic Hand Beta Band Intermuscular Coherence Increases Following non-Paretic Hand Exercise to Task-Failure in

Qian Ding1,2, Theresa E McGuirk1,3, Elliott S Perry1

  • 1Biomechanics, Rehabilitation, and Integrative Neuroscience (BRaIN) Lab, Department of Rehabilitation Medicine, University of Washington School of Medicine, Seattle, WA, USA.

Restorative Neurology and Neuroscience
|May 6, 2026
PubMed
Summary

Exercise to task-failure in the non-paretic hand acutely enhances corticospinal connectivity and manual dexterity in the paretic hand of stroke survivors. This suggests a novel neurorehabilitation strategy.

Keywords:
dexterityintermuscular coherencestroke rehabilitationtask-failure

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Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Motor Control

Background:

  • Intermuscular coherence (IMC) in the beta band is a non-invasive measure of corticospinal connectivity.
  • Stroke often damages the corticospinal tract, impairing manual dexterity.
  • Reduced corticospinal connectivity may underlie motor deficits after stroke.

Purpose of the Study:

  • To investigate acute adaptations in IMC and manual dexterity following exercise to task-failure in chronic stroke survivors.
  • To examine the relationship between corticospinal connectivity and manual dexterity.
  • To determine if non-paretic hand exercise influences paretic hand motor function.

Main Methods:

  • Fifteen chronic stroke survivors and seven healthy controls performed exercise to task-failure with their non-paretic/dominant hand.
  • Manual dexterity was assessed using the Box-and-Blocks Test (BBT).
  • Intermuscular coherence (IMC) in beta and gamma bands was measured at baseline and up to 4 hours post-exercise.

Main Results:

  • Stroke survivors had reduced baseline beta and gamma band IMC in the paretic hand.
  • Baseline paretic hand BBT performance correlated positively with gamma band IMC.
  • Paretic hand BBT performance and beta band IMC increased acutely after non-paretic hand exercise to task-failure.

Conclusions:

  • Non-paretic hand exercise to task-failure acutely enhances corticospinal connectivity to the paretic hand.
  • This approach concurrently improves paretic hand manual dexterity.
  • This strategy holds potential for promoting motor recovery in neurorehabilitation.