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Adapting lateral stepping control to walk on winding paths.

Anna C Render1, Joseph P Cusumano2, Jonathan B Dingwell1

  • 1Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA.

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Area of Science:

  • Biomechanics
  • Human motor control
  • Gait analysis

Background:

  • Gait biomechanics research often focuses on straight-line walking.
  • Real-world walking involves complex lateral maneuvers that challenge balance and increase fall risk.
  • Understanding stepping adjustments during varied walking tasks is crucial for fall prevention.

Purpose of the Study:

  • To investigate how individuals regulate step width and lateral body position during walking on virtual paths of varying widths and curvatures.
  • To quantify motor control strategies employed during complex gait maneuvers using the Goal Equivalent Manifold (GEM) framework.

Main Methods:

  • 24 adults walked on virtual paths (wide/narrow, straight/slowly-winding/quickly-winding).
  • Step width and lateral body position were recorded.
  • The Goal Equivalent Manifold (GEM) framework was used to analyze step-to-step adjustments in position and step width.

Main Results:

  • On narrow paths, participants reduced step width variability and lateral position variability.
  • On winding paths, participants adopted narrower and more variable steps.
  • Path curvature influenced the prioritization of step width versus lateral position regulation.

Conclusions:

  • Gait regulation strategies adapt based on path constraints and curvature.
  • On slowly winding paths, step width maintenance was prioritized over lateral position.
  • On quickly winding paths, both step width and lateral position were prioritized, suggesting a strategy to maximize maneuverability.