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Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
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Stability-maneuverability trade-offs during lateral steps.

Julian Acasio1, Mengnan/Mary Wu2, Nicholas P Fey3

  • 1Department of Biomedical Engineering, Northwestern University, Evanston, IL, USA.

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Summary
This summary is machine-generated.

People balance stability and energy when choosing foot placement for walking maneuvers. Wider steps increase stability and energy costs, with individuals preferring an intermediate width.

Keywords:
EnergyGaitManeuverMargin of stabilityWork

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Area of Science:

  • Biomechanics
  • Human locomotion
  • Motor control

Background:

  • Walking maneuvers involve balancing stability, impulse generation, and energy efficiency.
  • These factors are interconnected and influence foot placement strategy selection.

Purpose of the Study:

  • To investigate how lateral foot placement affects stability, maneuverability, and energetics during walking.
  • To understand the trade-offs individuals make when selecting foot placement strategies.

Main Methods:

  • Ten healthy adults performed laterally-directed walking maneuvers with varied mediolateral foot placement.
  • Foot placement ranged from cross-over steps to side-steps.

Main Results:

  • Increased push-off step width correlated with greater lateral margin of stability, peak lateral impulse, and total joint work.
  • Subjects naturally selected an intermediate foot placement when unconstrained, indicating a preference for balanced trade-offs.
  • A significant positive correlation was found between lateral margin of stability and peak lateral impulse (r=0.773).

Conclusions:

  • Foot placement strategies in walking maneuvers are optimized to balance stability, maneuverability, and energy expenditure.
  • Individuals dynamically adjust their foot placement to manage competing biomechanical demands.
  • Findings highlight the complex interplay between passive stability and active force generation during locomotion.