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Related Experiment Videos

Changes in the hemiparetic limb with training. I. Torque output

P A Mathieu1, S J Sullivan

  • 1Biomedical Engineering Institute, Université de Montréal, Canada.

Electromyography and Clinical Neurophysiology
|December 1, 1995
PubMed
Summary

Electromyographic biofeedback improved shoulder activity in six of eleven patients with cerebro-vascular accident (CVA). Improvement was linked to pre-training Fugl-Meyer scores, suggesting targeted rehabilitation potential.

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Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Biomedical Engineering

Background:

  • Cerebro-vascular accident (CVA) often results in hemiplegia, impacting upper extremity function.
  • Restoring shoulder activity is crucial for functional recovery after CVA.
  • Electromyographic (EMG) biofeedback offers a potential avenue for targeted muscle rehabilitation.

Purpose of the Study:

  • To evaluate the efficacy of EMG biofeedback in enhancing shoulder activity in post-CVA patients.
  • To identify predictors of successful response to EMG biofeedback therapy.
  • To assess the correlation between functional scores and objective measures of shoulder activity.

Main Methods:

  • Eleven patients with recent CVA (<6 months) participated in an EMG biofeedback program.
  • Isometric contractions were used to measure mean torque and standard deviation (SD) pre- and post-training.
  • Success was defined as a post/pre training mean torque ratio >= 1.5.

Main Results:

  • EMG biofeedback showed negligible effects on the contralateral limb (mean torque: 30.99 Nm pre vs 31.02 Nm post).
  • Six out of eleven patients with hemiplegic limbs demonstrated improved muscular activity.
  • Successful outcomes were associated with pre-training upper extremity Fugl-Meyer scores <= 13.

Conclusions:

  • EMG biofeedback can improve shoulder muscle activity in a subset of CVA patients.
  • Pre-training Fugl-Meyer scores may predict response to EMG biofeedback for shoulder rehabilitation.
  • The Fugl-Meyer score has limited utility in assessing localized changes from specific interventions like EMG biofeedback.

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