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Simulation of Human-induced Vibrations Based on the Characterized In-field Pedestrian Behavior
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Angular momentum during unexpected multidirectional perturbations delivered while walking.

Dario Martelli1, Vito Monaco, Lorenzo Bassi Luciani

  • 1The BioRobotics Institute, Scuola Superiore Sant’Anna, 56026-Pontedera (PI), Italy. d.martelli@sssup.it

IEEE Transactions on Bio-Medical Engineering
|January 30, 2013
PubMed
Summary
This summary is machine-generated.

Body segment coordination during walking and unexpected disturbances shows similar patterns, influenced by perturbation direction but not side. This suggests common neural pathways control upper and lower body movements.

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Human Movement Science

Background:

  • Understanding how the human body coordinates movement across different segments is crucial for analyzing locomotion and balance.
  • Investigating responses to unexpected perturbations reveals insights into the central nervous system's (CNS) motor control strategies.
  • The role of laterality and perturbation direction in intersegmental coordination remains an area requiring further exploration.

Purpose of the Study:

  • To test the hypothesis that body segment contributions to whole-body responses during walking and perturbations share similar, direction-dependent features.
  • To determine if intersegmental coordination is influenced by the laterality of unexpected perturbations.
  • To explore the CNS's ability to integrate sensory information for context-dependent motor responses.

Main Methods:

  • Fifteen young adults performed walking tasks while managing ten unexpected unilateral perturbations.
  • Whole-body angular momentum was calculated by summing segmental angular momenta.
  • Principal component analysis (PCA) was employed to identify key features of intersegment coordination.

Main Results:

  • Intersegmental coupling exhibited similar characteristics during walking and perturbation responses, particularly in the frontal plane.
  • Perturbation direction significantly influenced angular momentum regulation, indicating context-dependent motor control.
  • Motor schemes showed anisotropic features related to subject dominance, suggesting laterality effects.
  • Reactive responses to perturbations led to more consistent motor schemes across segments than during normal walking.

Conclusions:

  • The CNS interprets multi-sensory inputs to generate context-specific reactive responses, with perturbation direction being a key factor.
  • Upper and lower body segments coordinate synergistically, supporting the hypothesis of common neural pathways.
  • While direction influences coordination, laterality effects may depend on individual subject dominance.