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Related Experiment Videos

Interlimb influences on paretic leg function in poststroke hemiparesis.

S A Kautz1, C Patten

  • 1Brain Rehabilitation Research Center, Malcom Randall VA Medical Center, Gainesville, FL 32608-1197, USA. skautz@phhp.ufl.edu

Journal of Neurophysiology
|December 14, 2004
PubMed
Summary

Stroke survivors

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Area of Science:

  • Neuroscience
  • Motor Control
  • Rehabilitation Science

Background:

  • Paretic leg motor impairment post-stroke is often viewed as unilateral.
  • Neural control of leg function is typically bilateral, influencing coordinated movements.
  • Nonparetic leg sensorimotor state may impact paretic leg motor patterns during bilateral tasks.

Purpose of the Study:

  • Investigate paretic leg motor patterns during bilateral vs. unilateral tasks.
  • Determine if nonparetic leg participation improves or worsens coordination deficits.
  • Examine interlimb influences on motor control after stroke.

Main Methods:

  • Used a custom pedaling apparatus to mechanically decouple legs.
  • Assessed isometric force generation, discrete movements, and pedaling tasks.
  • Collected bilateral electromyography and pedal force data from stroke survivors and controls.

Main Results:

  • Nonparetic leg influences on paretic leg coordination were similar in unilateral and bilateral tasks for isometric and discrete movements.
  • Interlimb influences differed in bilateral pedaling, exacerbating paretic leg coordination deficits compared to controls.
  • Controls may suppress interlimb influences during pedaling, a process potentially disrupted in hemiparesis.

Conclusions:

  • Bilateral pedaling tasks reveal exacerbated paretic leg coordination deficits in stroke survivors.
  • Disrupted suppression of interlimb influences may underlie impaired motor output during bilateral tasks.
  • Coupling of leg pattern generation leads to greater, but more impaired, paretic leg motor output during bilateral pedaling.

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