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Related Experiment Videos

Postural responses triggered by multidirectional leg lifts and surface tilts.

Lucinda K Hughey1, Joyce Fung

  • 1School of Physical & Occupational Therapy, McGill University, 3654 Prom. Sir William Osler, Montreal, Quebec, Canada, H3G 1Y5.

Experimental Brain Research
|June 9, 2005
PubMed
Summary

This study compared voluntary leg lifts and surface tilts, finding that trunk stabilization is key for controlling body movement regardless of perturbation type. Both tasks demonstrated dynamic center of pressure use to manage center of mass displacement.

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Area of Science:

  • Biomechanics
  • Motor Control
  • Human Movement Science

Background:

  • Postural control involves both proactive and reactive mechanisms.
  • Understanding trunk stabilization is crucial for analyzing voluntary and involuntary movements.

Purpose of the Study:

  • To investigate the relationship between proactive and reactive postural control.
  • To contrast kinematic and electromyographic (EMG) responses during voluntary leg lifts and unexpected surface tilts.
  • To determine the role of trunk stabilization in voluntary and involuntary weight shifts.

Main Methods:

  • Subjects performed multidirectional voluntary leg lifts and maintained balance during unexpected surface tilts.
  • Kinematic and electromyographic (EMG) data were collected.

Related Experiment Videos

  • Principal component analysis quantified axial postural strategies.

    • Main Results:

    • Center of pressure (COP) displacement preceded or coincided with center of mass (COM) displacement in both tasks.
    • Muscles were recruited in a distal-to-proximal sequence.
    • Trunk stabilization was prioritized during unexpected tilts, while leg lifting involved trunk verticality compromise.

    Conclusions:

    • The central nervous system prioritizes trunk stabilization for controlling body COM displacement.
    • This strategy is consistent across voluntary and involuntary perturbations.
    • Dynamic COP control is essential for managing COM displacement during postural tasks.