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Head extension effect in static posturography

M E Norré1

  • 1Department of Otoneurology, University Hospital, Leuven, Belgium.

The Annals of Otology, Rhinology, and Laryngology
|July 1, 1995
PubMed
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Head extension increases postural sway in normal subjects. In patients with vestibular disorders, its effect varies, suggesting head extension in posturography does not reliably reveal vestibular dysfunction.

Area of Science:

  • Neuroscience
  • Biomechanics
  • Vestibular System

Background:

  • Postural sway is influenced by sensory input, including vestibular and proprioceptive information.
  • Head position can alter sensory input, potentially affecting balance control.
  • Static posturography type III (SPGIII) is used to assess sensory interactions in postural control.

Purpose of the Study:

  • To investigate the effect of head extension on postural sway in normal subjects and patients with peripheral vestibular disorders.
  • To evaluate whether head extension in SPGIII can reliably indicate vestibular dysfunction.

Main Methods:

  • Utilized static posturography type III (SPGIII) with six sensory interaction tests.
  • Compared postural sway during head extension versus normal head position on stable and foam rubber platforms.

Related Experiment Videos

  • Analyzed differences in postural sway between head extension and normal positions in patients with peripheral vestibular disorders.

    • Main Results:

    • Head extension increased postural sway in normal subjects, with no significant difference between stable and foam platforms.
    • In patients with peripheral vestibular disorders, head extension's effect on postural sway varied (positive, zero, or negative) on both platforms.
    • Minor nuances observed: positive effects more pronounced in benign paroxysmal positional vertigo, negative effects in unilateral vestibular deficits.

    Conclusions:

    • Head extension in SPGIII does not appear to be a reliable indicator of vestibular dysfunction.
    • The ambiguous effect of head extension, influenced by both neck proprioception and otoliths, complicates interpretation.
    • Both neck proprioceptive and otolithic mechanisms may contribute to the observed effects of head extension on posture.