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Consistent inconsistencies in braking: a spatial analysis.

Alexandra G Hammerberg1, Patricia Ann Kramer1

  • 1Primate Evolutionary Biomechanics Laboratory, University of Washington, Seattle, WA 98195-3100, USA.

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|December 23, 2021
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Summary
This summary is machine-generated.

Contrary to expectations, foot pressure during walking is more consistently centered during propulsion than braking. This finding impacts understanding of foot biomechanics and bipedal evolution.

Keywords:
anthroengineeringcentre of pressurehuman movementspatial statistics

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Area of Science:

  • Biomechanics
  • Human locomotion
  • Spatial statistics

Background:

  • The bipedal body in motion is a complex system studied by engineers, clinicians, and anthropologists.
  • Spatial statistics offers a practical method for analyzing the two-dimensional topography of the foot.
  • Understanding foot pressure distribution is crucial for predicting fatigue and evolutionary mechanisms.

Purpose of the Study:

  • To quantify the clustering of the center of pressure (CoP) on the foot during walking.
  • To assess the consistency of peak force locations during braking and propulsive phases.
  • To test the hypothesis that CoPs cluster in the hindfoot during braking and forefoot during propulsion, with braking showing more consistency.

Main Methods:

  • Collected vertical ground reaction forces (GRFs) using a wireless insole system (MoticonReGo AG) from 11 participants.
  • Analyzed the clustering of the center of pressure (CoP) across multiple, contiguous walking steps.
  • Applied spatial statistics to assess the consistency of CoP location during braking and propulsion.

Main Results:

  • Contrary to the hypothesis, CoPs during the braking phase were inconsistent in location.
  • CoPs during the propulsive phase were more consistent and clustered across participants and trials.
  • The study found greater consistency in propulsive forces than in braking forces.

Conclusions:

  • The location of peak forces during walking is more consistent during propulsion than braking.
  • These findings enhance the understanding of applied forces on the foot.
  • This research contributes to predicting fatigue failures and understanding the evolution of the bipedal form.