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Experimental Methods to Study Human Postural Control

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

Adaptation process for standing postural control in individuals with hemiparesis.

Yasuhiro Kiyota¹, Kimitaka Hase, Hayato Nagashima

¹Division of Rehabilitation Medicine, Keio University Hospital, Shinjuku-ku, Tokyo, Japan.

Disability and Rehabilitation

|May 20, 2011

Summary

Stroke patients with hemiparesis improve standing balance by shifting weight to their non-paretic leg. This adaptation reduces body sway and over-activity in the non-paretic leg over time.

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Area of Science:

Neuroscience
Rehabilitation Medicine
Biomechanics

Background:

Stroke often results in hemiparesis, affecting postural control.
Impaired standing balance is a common challenge for hemiparetic patients post-stroke.

Purpose of the Study:

To investigate the adaptation process of standing postural control in hemiparetic individuals.
To understand how patients with hemiparesis develop upright stance capabilities.

Main Methods:

Evaluated nine hemiparetic patients within 19 days post-stroke.
Recorded ground reaction forces and surface electromyography (EMG) during repeated standing trials.
Analyzed changes in center of pressure (COP) and integrated EMG data over time.

Main Results:

Initially, patients used the non-paretic leg more, with increased muscular activity.
Center of pressure (COP) displacement decreased with experience (P < 0.05).
Postural adaptation involved shifting sway to the non-paretic side and reducing biceps femoris activity (P < 0.01).

Conclusions:

Weight-bearing asymmetry aids in reducing body sway and muscular over-activity in the non-paretic leg.
Rehabilitation should consider weight-bearing asymmetry as a systematic postural control strategy in hemiparetic patients.