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Hand function and motor cortical output poststroke: are they related?

Brenda J Brouwer1, Kim Schryburt-Brown

  • 1Motor Performance Laboratory, School of Rehabilitation Therapy, Queen's University, Kingston, ON, Canada. brouwerb@post.queensu.ca

Archives of Physical Medicine and Rehabilitation
|April 26, 2006
PubMed
Summary

Hand function after stroke depends on cortical excitability, which changes over time. These findings highlight distinct recovery phases in subacute and chronic stroke patients.

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Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Motor Control

Background:

  • Stroke significantly impacts hand function and cortical excitability.
  • Understanding these changes is crucial for effective rehabilitation strategies.

Purpose of the Study:

  • To characterize hand function and cortical excitability in chronic and subacute stroke recovery.
  • To explore the relationship between hand function and cortical measures.

Main Methods:

  • Observational study with case-control and pre-post cohort designs.
  • Assessed hand function (finger tapping, peg placing, strength) and cortical excitability using transcranial magnetic stimulation (TMS).
  • Included 14 subacute stroke, 14 chronic stroke, and 14 healthy control participants.

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Main Results:

  • Stroke survivors exhibited diminished hand function, smaller motor-evoked potentials (MEPs), and prolonged silent periods compared to controls.
  • Subacute stroke showed longer MEP latencies and smaller amplitudes than chronic stroke.
  • Greater MEP amplitude symmetry and lower motor threshold correlated with better hand function in subacute and chronic stroke, respectively.

Conclusions:

  • Cortical excitability is a key determinant of post-stroke hand function.
  • Cortical excitability evolves over time, indicating distinct neuromuscular recovery phases in subacute and chronic stroke.