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Related Experiment Videos

Backward and forward leaning postures modelled by an fBm framework.

P Rougier1, C Burdet, I Farenc

  • 1Laboratoire de Modélisation des Activities Sportives, Departement STAPS, UFR CISM, Universite de Savoie, Domaine Universitaire de Savoie-Technolac, F-73 376 cedex, Le Bourget du Lac, France. practice.rougier@univ-savoie.fr

Neuroscience Research
|September 6, 2001
PubMed
Summary

Body leaning alters postural control by changing how the center of gravity (CG) and center of pressure (CP) move. Leaning reduces the time for corrective actions, impacting balance strategies.

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Area of Science:

  • Biomechanics
  • Human Physiology
  • Control Theory

Background:

  • Postural control is crucial for stability.
  • Body leaning significantly impacts balance mechanisms.
  • Previous studies often focus on center of pressure (CP) alone.

Purpose of the Study:

  • To investigate the effects of body leaning on postural control.
  • To analyze the relationship between center of pressure (CP) and center of gravity (CG) during postural sway.
  • To model postural control dynamics using fractional Brownian motion (fBm).

Main Methods:

  • Recorded center of pressure (CP) displacements in healthy subjects.
  • Experiment involved three conditions: upright (REF), backward leaning (BWD), and forward leaning (FWD).

Related Experiment Videos

  • Analyzed motions of vertical projections of the center of gravity (CG(v)) and CP-CG(v) using frequential analysis and fBm modeling.

    • Main Results:

    • Body leaning primarily affects CP-CG(v) motions, indicating increased muscular activity.
    • Changes in CG(v) motions, particularly in the antero-posterior (AP) direction, were observed.
    • Leaning reduced the time interval (Deltat) for corrective processes and increased sway distance.

    Conclusions:

    • Center of pressure (CP) displacements alone are insufficient to fully represent body sway during upright stance.
    • Body leaning alters the dynamics of postural control, shifting the balance between open-loop and closed-loop processes.
    • CG(v) motions provide a more comprehensive understanding of postural control adjustments during leaning postures.