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Related Experiment Video

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Experimental Methods to Study Human Postural Control

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

Neural-mechanical feedback control scheme generates physiological ankle torque fluctuation during quiet stance.

Albert H Vette¹, Kei Masani, Kimitaka Nakazawa

¹Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, ON M5S3G9, Canada. a.vette@utoronto.ca

IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society

|January 15, 2010

Summary

A proportional and derivative (PD) controller effectively regulates active ankle torque for body stabilization during quiet stance, even with significant sensory-motor delays. This neural-mechanical model accurately mimics human control strategies.

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Area of Science:

Neuroscience
Biomechanics
Control Systems Engineering

Background:

Quiet stance involves complex ankle torque regulation for body stabilization.
Sensory-motor time delays pose a challenge for maintaining balance.
Previous work suggested proportional and derivative (PD) controllers for active ankle torque regulation.

Purpose of the Study:

To model active and passive ankle torque mechanisms and their contributions to standing.
To investigate if a neural-mechanical control scheme with a PD controller can replicate observed ankle torque in healthy individuals during quiet stance.

Main Methods:

Fourteen healthy subjects stood on a force platform while body sway, soleus muscle EMG, and ankle torque were recorded.
Two models were optimized: Model I for active/passive torque, Model II for a PD controller within a neural-mechanical scheme.
Model performance was validated using independent data sets.

Main Results:

Both passive and active ankle torque mechanisms significantly contribute to body stabilization during quiet stance.
The neural-mechanical control scheme with a PD controller successfully replicated measured ankle torque.
The PD controller effectively models the central nervous system's strategy for active ankle torque regulation despite time delays.

Conclusions:

Active and passive ankle torques are crucial for maintaining stability during quiet standing.
A PD controller is a valid model for the neural strategy regulating active ankle torque, compensating for sensory-motor delays.
The proposed neural-mechanical control scheme accurately reflects physiological control during quiet stance.