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Comparison of Kinetic Characteristics of Footwork during Stroke in Table Tennis: Cross-Step and Chasse Step
Published on: June 16, 2021
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Post-stroke deficits in the step-by-step control of paretic step width
Katy H Stimpson1, Lauren N Heitkamp1, Aaron E Embry2
1Department of Health Sciences and Research, Medical University of South Carolina (MUSC), Charleston, SC, USA.
Gait & Posture
|March 12, 2019
Summary
Stroke survivors show impaired step width control, relying on wider steps and a larger margin of stability instead of pelvis dynamics for gait stability. This suggests a shift towards feed-forward strategies post-stroke.
Area of Science:
- Neuroscience
- Biomechanics
- Rehabilitation Science
Background:
- Humans use step width adjustments based on pelvis movement for gait stability.
- Post-stroke, impaired leg control may hinder this dynamics-dependent control of step width.
Purpose of the Study:
- To investigate if chronic stroke survivors have deficits in dynamics-dependent step width control on their paretic leg.
Main Methods:
- Assessed step width control relative to pelvis dynamics in 20 chronic stroke survivors at self-selected and fastest speeds.
- Used partial correlations to analyze pelvis displacement and velocity effects on step width.
- Measured step width, lateral foot placement, and margin of stability (MoS).
Main Results:
- Paretic steps showed a weaker link between step width and pelvis dynamics, especially pelvis displacement.
- Paretic steps were placed more laterally, resulting in a larger and more variable MoS.
- Faster walking speed reduced step width, but did not alter the paretic-side control deficit.
Conclusions:
- Stroke survivors exhibit reduced reactive control of step width linked to pelvis dynamics on the paretic side.
- They compensate with wider step placement and increased MoS, indicating reliance on feed-forward stabilization strategies.
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