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The Impact of Motor Task Conditions on Goal-Directed Arm Reaching Kinematics and Trunk Compensation in Chronic Stroke Survivors
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Need for speed: better movement quality during faster task performance after stroke.

Stacey L DeJong1, Sydney Y Schaefer, Catherine E Lang

  • 1Washington University, Saint Louis, MO 63108, USA.

Neurorehabilitation and Neural Repair
|December 6, 2011
PubMed
Summary

Instructing individuals with hemiparesis to move faster during upper-extremity rehabilitation improves movement quality. This simple change can enhance task-specific training intensity post-stroke without additional cost.

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Area of Science:

  • Neurorehabilitation
  • Motor control after stroke
  • Biomechanics of upper extremity

Background:

  • Hemiparesis post-stroke often involves slow, insufficient muscle activation.
  • Current upper-extremity rehabilitation rarely emphasizes movement speed.
  • The impact of increased movement speed on paretic limb quality is unknown.

Purpose of the Study:

  • To investigate if faster movements enhance or impair paretic limb task performance post-stroke.
  • To compare movement quality at preferred versus maximal speeds in individuals with hemiparesis.

Main Methods:

  • 16 individuals with post-stroke hemiparesis and 11 healthy controls performed reach-grasp-lift tasks.
  • Tasks were performed at preferred and maximal speeds using palmar and 3-finger grips.
  • Measured parameters included phase durations, reach path straightness, aperture, finger movement efficiency, and grip force.

Main Results:

  • Both groups reduced reach and grasp durations when moving faster.
  • Hemiparetic group's fast reach durations matched controls' preferred speed durations.
  • Movement quality improved: straighter reaches, larger apertures, and better finger movement efficiency in the fast condition for the hemiparetic group.

Conclusions:

  • Individuals with hemiparesis can increase movement speed and improve quality.
  • Faster movements enhance task-specific training intensity cost-effectively.
  • Simple instructions to move faster may be a valuable rehabilitation strategy.