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Related Experiment Video

Updated: May 31, 2026

Experimental Methods to Study Human Postural Control

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

Modelling human balance using switched systems with linear feedback control.

Piotr Kowalczyk¹, Paul Glendinning, Martin Brown

¹School of Computing, Mathematics and Digital Technology, John Dalton Building, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK. p.kowalczyk@mmu.ac.uk

Journal of the Royal Society, Interface

|June 24, 2011

Summary

This summary is machine-generated.

Human sway motion during quiet standing is modeled as an inverted pendulum with feedback control. Stable limit cycles were discovered, revealing multi-stability and complex bifurcations in body balance.

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Last Updated: May 31, 2026

Experimental Methods to Study Human Postural Control

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

A Modified Lean and Release Technique to Emphasize Response Inhibition and Action Selection in Reactive Balance

A Modified Lean and Release Technique to Emphasize Response Inhibition and Action Selection in Reactive Balance

Published on: March 19, 2020

Area of Science:

Biomechanics
Control Theory
Human Physiology

Background:

Quiet standing involves continuous postural sway in healthy humans.
Understanding the control mechanisms of human balance is crucial for rehabilitation and robotics.
Previous models often simplify the complex dynamics of the human body.

Purpose of the Study:

To investigate the mechanisms and characteristics of human sway during quiet standing.
To develop and analyze a mathematical model representing human postural control.
To identify conditions leading to stable and unstable balance.

Main Methods:

Modeling the human body as a single-link inverted pendulum.
Implementing a linear feedback control system for balance.
Deriving and analyzing a switched dynamical model.
Exploring the parameter space to find stable periodic motions (limit cycles).

Main Results:

Stable periodic motions (limit cycles) around the upright position were identified.
The existence of these limit cycles was shown to be dependent on system parameters.
Multi-stability and homoclinic bifurcations were detected through parameter space exploration.

Conclusions:

The inverted pendulum model with linear feedback control can replicate stable sway motions in human quiet standing.
The study reveals complex dynamical behaviors, including multi-stability, which are critical for understanding human balance.
These findings provide insights into the fundamental principles governing human postural control.