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Vestibular stimulation affects medium latency postural muscle responses.

Fay B Horak1, Frantisek Hlavacka

  • 1Neurological Sciences Institute, Oregon Health and Science University, 505 NW 185th Avenue, Beaverton, OR 97006, USA. horakf@ohsu.edu

Experimental Brain Research
|April 27, 2002
PubMed
Summary

Galvanic vestibular stimulation (GVS) alters automatic postural responses by changing the body's equilibrium goal. This neurostimulation affects medium-latency responses in prime movers, influencing trunk tilt and muscle activity during balance adjustments.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Human Motor Control

Background:

  • Previous research indicated galvanic vestibular stimulation (GVS) alters vertical perception.
  • GVS applied before platform translation shifted center of pressure and equilibrium position.
  • The effect of GVS on automatic postural responses requires further investigation.

Purpose of the Study:

  • To investigate if GVS modifies automatic postural muscle responses to surface translations.
  • To determine the role of GVS in altering medium-latency postural adjustments.

Main Methods:

  • Subjects received GVS prior to platform translations.
  • Electromyography recorded ankle muscle responses (gastrocnemius, soleus).
  • Kinematic analysis assessed trunk, shank, and thigh segment angles.

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Main Results:

  • GVS (0.2-0.4 mA) significantly altered trunk tilt during postural responses.
  • Changes in early muscle responses correlated with direct vestibulospinal effects.
  • Later muscle response changes aligned with altered postural equilibrium goals.

Conclusions:

  • GVS can modify medium-latency automatic postural responses.
  • The effect appears mediated by altering the postural equilibrium goal.
  • GVS influences prime movers in postural control, not proximal or antagonist muscles.