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Postural coordination modes and transition: dynamical explanations.

Myriam Ferry1, Violaine Cahouët, Luc Martin

  • 1GIPSA, UMR CNRS 5216, Equipe Systèmes BioMécaniques, ENSIEG, 961 Rue de la Houille Blanche, BP 46, 38402, Saint Martin d'Heres cedex, France. myriam.ferry@ujf-grenoble.fr

Experimental Brain Research
|January 27, 2007
PubMed
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This study reveals how postural coordination shifts between in-phase and anti-phase modes. The center of pressure and joint moments are key factors influencing these transitions for efficient movement control.

Area of Science:

  • Biomechanics
  • Human Motor Control
  • Dynamical Systems Theory

Background:

  • Previous research quantified postural behavior.
  • Understanding transitions between coordination modes requires examining underlying control strategies.

Purpose of the Study:

  • Investigate the causes of transitions between postural coordination modes.
  • Identify efficient control strategies for postural behavior using dynamical variables.

Main Methods:

  • Six subjects maintained head-target distance during visual target oscillation.
  • Target motion frequency gradually increased within sessions.
  • Kinematic and dynamical analyses were performed.

Main Results:

  • A sudden transition between in-phase and anti-phase postural coordination modes was observed.

Related Experiment Videos

  • Center of pressure (CoP) position is crucial for determining coordination mode.
  • System limits, including equilibrium constraints and physiological limits, drive behavioral changes.

    • Conclusions:

    • The anti-phase mode offers better muscular moment distribution (hip and ankle joints).
    • The anti-phase mode is more effective for high-frequency oscillations with limited CoP displacements.
    • Understanding these dynamics informs efficient postural control strategies.