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Experimental Methods to Study Human Postural Control

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

Interjoint dynamic interaction during constrained human quiet standing examined by induced acceleration analysis.

Shun Sasagawa¹, Masahiro Shinya, Kimitaka Nakazawa

¹Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Meguro-ku, Tokyo, Japan; and.

Journal of Neurophysiology

|October 4, 2013

Summary

The central nervous system (CNS) uses joint interactions to stabilize quiet standing. By coordinating ankle and hip torques, the CNS reduces joint angular accelerations, ensuring smooth body sway control.

Keywords:

biomechanics induced acceleration analysis interjoint coordination multisegment model quiet standing

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Area of Science:

Human motor control
Biomechanics
Neuroscience

Background:

Human quiet standing is a complex multijoint movement requiring the central nervous system (CNS) to manage dynamic interjoint interactions.
Optimal motor performance in standing relies on the CNS effectively coordinating multiple joints.

Purpose of the Study:

To investigate how the CNS manages interjoint interactions during quiet standing.
To examine the relationship between joint kinetics (torques) and kinematics (angular accelerations) in a multi-degree of freedom system.

Main Methods:

Modeling quiet standing as a double-link inverted pendulum system with ankle and hip joints.
Utilizing an induced acceleration analysis to quantify torque-acceleration relationships.

Main Results:

Net ankle and hip torques induced comparable angular accelerations in their respective joints.
Torques modulated angular accelerations in a temporally antiphase pattern between the ankle and hip joints.
This coordination countercompensated torques, reducing resultant joint angular accelerations by approximately 70%.

Conclusions:

The CNS leverages interjoint interactions to minimize large resultant angular accelerations in individual joints during quiet standing.
This strategy prevents excessive body sway by effectively managing the combined kinematic effects of multiple joint torques.