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On Laterally Perturbed Human Stance: Experiment, Model, and Control.

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Researchers developed a double-inverted pendulum model to analyze human balance during lateral perturbations. This model accurately fits and predicts human reactions, revealing key balance features like torque coupling and delays.

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Area of Science:

  • Biomechanics
  • Human Motor Control

Background:

  • Human balance is crucial in various research fields.
  • Developing analytical models for human stability is a key objective.

Purpose of the Study:

  • To analyze human stability during lateral perturbations.
  • To propose a planar double-inverted pendulum model for human balance.

Main Methods:

  • Experimentally perturbed five subjects laterally on a mobile platform.
  • Modeled human reaction using a double-inverted pendulum with torque control at the ankle and pelvis.
  • Utilized least squares and nonlinear unconstrained optimization for model fitting and prediction.

Main Results:

  • Observed human motion divided into two distinct phases: leg segment and head-arms-trunk segment.
  • The model successfully fitted and predicted human reactions on training and test sets.
  • Extracted key balance features, including torque coupling and time delays.

Conclusions:

  • A planar double-inverted pendulum model effectively represents human balance responses to lateral perturbations.
  • Identified time delays are consistent with physiological ranges for compensatory movements.
  • The model provides insights into the interplay of reflex and higher-level motor control in maintaining balance.