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Does dynamic stability govern propulsive force generation in human walking?

Michael G Browne1, Jason R Franz1

  • 1Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Chapel Hill, NC, USA.

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|January 2, 2018
PubMed
Summary
This summary is machine-generated.

Older adults may reduce push-off force for stability, but this worsens balance. Young adults naturally maximize dynamic stability by optimizing walking speed and propulsive force (FP) generation.

Keywords:
ageingbalancebiofeedbackpush-offvariabilitywalking speed

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Area of Science:

  • Biomechanics
  • Human locomotion
  • Gerontology

Background:

  • Older adults often exhibit slower walking speeds and reduced push-off force, potentially to enhance stability.
  • The direct impact of reduced propulsive force (FP) on dynamic balance, independent of walking speed, is not well understood.

Purpose of the Study:

  • To investigate the independent effects of walking speed and propulsive force (FP) on dynamic stability in young adults.
  • To determine if young adults prioritize dynamic stability when choosing their preferred walking speed and FP.

Main Methods:

  • Young adults walked on a force-measuring treadmill across various speeds.
  • Propulsive force (FP) was modulated using visual biofeedback at constant speeds.
  • Dynamic stability was assessed under different speed and FP conditions.

Main Results:

  • Diminished push-off force significantly worsened dynamic stability by up to 32%.
  • Young adults selected a propulsive force (FP) at their preferred speed that maximized dynamic stability.
  • Slower walking speeds did not improve dynamic stability when push-off was reduced.

Conclusions:

  • Reduced propulsive force (FP) independently impairs dynamic balance control.
  • Young adults actively optimize their gait to maximize dynamic stability.
  • Diminished push-off in older adults may independently contribute to balance deficits and slower walking speeds.