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Vibration-induced postural posteffects

M M Wierzbicka1, J C Gilhodes, J P Roll

  • 1Brockton/West Roxbury Veterans Affairs Medical Center and Department of Neurology, Harvard Medical School, Boston, Massachusetts 02132, USA.

Journal of Neurophysiology
|February 21, 1998
PubMed
Summary
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Mechanical vibration applied to ankles or neck in a seated position significantly alters standing posture. This postural modification, primarily affecting anterior-posterior balance, can persist long after the vibration stimulus ends.

Area of Science:

  • Neuroscience
  • Biomechanics
  • Human Motor Control

Background:

  • Muscle vibration in standing subjects typically elicits spatially oriented postural responses.
  • Termination of vibratory stimuli can trigger involuntary muscle contractions and limb movements.

Purpose of the Study:

  • To investigate the effects of low-amplitude mechanical vibration applied in a seated position on subsequent standing posture.
  • To determine the duration and directionality of postural modifications following vibration cessation.

Main Methods:

  • Vibration (30s) applied bilaterally to ankle tendons (anterior/posterior) or unilaterally to neck muscles (anterior/posterior).
  • Center of pressure trajectories monitored during quiet stance for up to 19 minutes post-vibration.
  • Comparison with pre-vibration control trials.

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Main Results:

  • Vibration induced strong and long-lasting dynamical modifications in standing posture in all participants.
  • Postural shifts were predominantly in the anterior-posterior direction.
  • The spatial orientation of the post-vibratory postural shift depended on the site of vibration (ankle vs. neck, anterior vs. posterior).

Conclusions:

  • Sustained sensory input from muscle vibration (Ia afferent activity) exerts a powerful after-effect on the motor system.
  • This after-effect significantly influences postural control, even after the stimulus is removed.
  • Seated vibration can be a tool to study and potentially modulate postural control mechanisms.