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[How mirror feedback improves undisturbed upright stance control].

¹Laboratoire de modélisation des activités sportives, université de Savoie, domaine universitaire de Savoie-Technolac, 73376 Le Bourget du Lac cedex, France. patrice.rougier@univ-savoie.fr

Annales De Readaptation Et De Medecine Physique : Revue Scientifique De La Societe Francaise De Reeducation Fonctionnelle De Readaptation Et De Medecine Physique

|March 7, 2002

Summary

Mirror feedback (MFB) enhances postural control in healthy adults by increasing ankle stiffness and reducing body sway, particularly in the antero-posterior direction. This technique shows promise for balance rehabilitation.

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Area of Science:

Human motor control
Biomechanics
Postural stability

Background:

Upright stance relies on complex sensorimotor integration.
Body sway, measured by center of pressure (CP) displacements, reflects postural control.
Mirror feedback (MFB) is a potential tool to modulate postural responses.

Purpose of the Study:

To investigate the postural effects of a body sway mirror feedback protocol in healthy adults.
To analyze the impact of MFB on center of gravity (CG) and CP-CG(v) components of body sway.

Main Methods:

Participants performed two conditions: eyes open (EO) and mirror feedback (MFB).
Force platform data measured center of pressure (CP) displacements.
Data were analyzed in the frequency domain using RMS and MPF parameters for antero-posterior (AP) and medio-lateral (ML) directions.

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Main Results:

MFB increased mean power frequency (MPF) in the AP direction, indicating increased ankle stiffness.
Root mean square (RMS) values decreased, suggesting reduced motor unit recruitment.
MFB diminished center of gravity (CG(h)) amplitudes, especially in the ML direction.

Conclusions:

Mirror feedback specifically alters postural control strategies, enhancing ankle stiffness and reducing sway.
The MFB technique is effective in modulating balance functions, particularly in the AP plane.
MFB shows potential as a tool for balance rehabilitation, especially for individuals with exaggerated CP-CG(v) motions.