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Intersegmental coordination in human slip perturbation responses.

Vaibhavsingh Varma1, Mitja Trkov1

  • 1Mechanical Engineering, Henry M. Rowan College of Engineering, Rowan University, Glassboro, NJ 08028, USA.

Journal of Biomechanics
|April 18, 2024
PubMed
Summary
This summary is machine-generated.

Human gait perturbations, like slips, disrupt lower limb coordination. This study quantifies deviations from normal walking patterns during slip recovery and falls, offering insights for balance assistance technologies.

Keywords:
Human locomotionIntersegmental coordinationLimb elevation anglesPlanar covariation lawSlip recovery

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Area of Science:

  • Biomechanics
  • Human Gait Analysis
  • Robotics Control Systems

Background:

  • Intersegmental coordination (ISC) and planar covariation law (PCL) are fundamental to human walking.
  • Gait perturbations, such as unexpected slips, disrupt normal ISC patterns and violate PCL.
  • Understanding these deviations is crucial for developing effective balance recovery strategies.

Purpose of the Study:

  • To investigate and characterize the evolution of lower limb intersegmental coordination during slip recoveries and falls.
  • To quantify the deviation from normal walking ISC patterns using a novel metric.
  • To provide insights into human natural recovery trajectories for designing assistive technologies.

Main Methods:

  • Analysis of gait data from seven subjects experiencing unexpected slips.
  • Characterization of ISC patterns from the step preceding slip initiation until slip cessation.
  • Application of a Euclidean distance-based metric (EDM) to quantify deviations at key gait events (slip start, foot strike, peak swing foot height).

Main Results:

  • ISC patterns during slip recovery significantly deviate from normal walking patterns.
  • The Euclidean distance-based metric (EDM) effectively quantifies these deviations.
  • Analysis revealed distinct temporal patterns of limb angles and foot placement post-slip.

Conclusions:

  • Human slip recovery involves substantial alterations in intersegmental limb coordination.
  • The observed recovery trajectories offer valuable data for understanding human balance.
  • Findings can inform the design of human-inspired controllers for exoskeleton-based balance assistance.