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Related Experiment Video

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Bilateral movements increase sustained extensor force in the paretic arm.

Nyeonju Kang1,2, James H Cauraugh2

  • 1a Laboratory for Rehabilitation Neuroscience , University of Florida , Gainesville , FL , USA.

Disability and Rehabilitation
|June 23, 2017
PubMed
Summary

Bilateral movements enhanced extensor force in the paretic arm poststroke, but decreased it in the nonparetic arm. This suggests bilateral training may aid stroke rehabilitation and functional recovery.

Keywords:
Chronic strokebilateral contractionparetic armsustained forcewrist extension

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Area of Science:

  • Neurorehabilitation
  • Motor Recovery
  • Biomechanics

Background:

  • Stroke frequently causes muscle weakness, particularly in wrist and finger extensors.
  • The efficacy of bilateral movements in improving paretic arm extensor force remains unclear.

Purpose of the Study:

  • To investigate the effect of bilateral versus unilateral movements on sustained isometric extensor force production in the paretic arm poststroke.
  • To compare force production, variability, and signal-to-noise ratio between unilateral paretic, unilateral nonparetic, and bilateral arm conditions.

Main Methods:

  • Seventeen chronic stroke survivors performed isometric wrist and finger extensions under unilateral paretic, unilateral nonparetic, and bilateral conditions.
  • Key metrics analyzed included mean force, force variability (coefficient of variation), and signal-to-noise ratio.

Main Results:

  • Bilateral arm movements significantly increased sustained force in the paretic arm compared to unilateral contractions.
  • Conversely, bilateral movements reduced sustained force in the nonparetic arm.
  • Force variability and signal-to-noise ratio did not differ between arms during bilateral contractions, unlike in unilateral conditions.

Conclusions:

  • Bilateral contractions transiently enhance extensor force in the paretic arm, offering a potential therapeutic advantage.
  • These findings suggest that rehabilitation strategies incorporating bilateral movements may improve functional recovery in stroke survivors.
  • The differing effects on paretic and nonparetic limbs highlight the complex neural adaptations during bilateral tasks.