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Dynamic instability during post-stroke hemiparetic walking.

Pei-Chun Kao1, Jonathan B Dingwell2, Jill S Higginson3

  • 1Department of Physical Therapy, University of Delaware, Newark, DE 19713, USA.

Gait & Posture
|June 17, 2014
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Summary
This summary is machine-generated.

Post-stroke individuals exhibit greater walking instability and gait variability, indicated by increased local divergence exponent and margin of stability variability. These findings suggest new objective measures for identifying fall risk in stroke survivors.

Keywords:
Dynamic stabilityGaitMargins of stabilityNon-linear dynamicsStroke

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Area of Science:

  • Neurology
  • Biomechanics
  • Gait Analysis

Background:

  • Falls and related injuries pose significant health and economic burdens for stroke survivors.
  • Currently, there is a lack of objective indicators to identify individuals at higher risk of falls post-stroke.

Purpose of the Study:

  • To quantify walking stability in stroke survivors compared to neurologically intact controls.
  • To identify specific stability measures that reflect post-stroke gait changes and fall risk.

Main Methods:

  • Nine post-stroke individuals and nine controls walked at various speeds on a treadmill.
  • Calculated trunk motion instability (short-term local divergence exponent [LDE] and maximum Floquet multiplier [maxFM]), dynamic margins of stability (MOS), and step spatiotemporal measures.

Main Results:

  • Post-stroke individuals showed higher mediolateral LDE and maxFM, indicating greater local and orbital instability.
  • Increased variability in MOS and step measures was observed in post-stroke individuals compared to controls.
  • While average step width was greater, average ML MOS was similar between groups.

Conclusions:

  • Post-stroke individuals exhibit altered walking stability and increased gait variability.
  • Short-term LDE of ML trunk motion and variability in MOS and step measures are sensitive indicators of post-stroke gait changes.
  • These measures hold potential for identifying stroke survivors at increased risk of falls.