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The Vestibular System01:29

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The vestibular system is a set of inner ear structures that provide a sense of balance and spatial orientation. This system is comprised of structures within the labyrinth of the inner ear, including the cochlea and two otolith organs—the utricle and saccule. The labyrinth also contains three semicircular canals—superior, posterior, and horizontal—that are oriented on different planes.
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Using Unidirectional Rotations to Improve Vestibular System Asymmetry in Patients with Vestibular Dysfunction
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Aging of vestibular function evaluated using correlational vestibular autorotation test.

Li-Chun Hsieh1, Hung-Ching Lin2, Guo-She Lee3

  • 1Institute of Brain Science, School of Medicine, National Yang-Ming University, Taipei, Taiwan ; Department of Otolaryngology, Mackay Memorial Hospital, Taipei, Taiwan.

Clinical Interventions in Aging
|September 13, 2014
PubMed
Summary

Vestibular function declines with age, as shown by a new correlational-vestibular autorotation test (cVAT). Visual-vestibular function declines earlier than vestibular function alone.

Keywords:
agingcorrelation analysiselectro-oculographygyrometryvestibular autorotation test

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Area of Science:

  • Gerontology
  • Neuroscience
  • Otolaryngology

Background:

  • Vestibular end-organ degeneration is common in the elderly, but aging effects are understudied.
  • Current vestibular autorotation tests (VAT) have limitations like poor reliability and sensor slippage.
  • A novel correlational-VAT (cVAT) system with a lightweight, wireless sensor was developed to assess age-related vestibular decline.

Purpose of the Study:

  • To evaluate the aging of vestibular function using a newly developed correlational-VAT (cVAT) system.
  • To assess the relationship between age and vestibular function across different test conditions.

Main Methods:

  • 53 healthy participants aged 25-75 were divided into five age groups.
  • Vertical and horizontal head autorotations (0-3 Hz) were performed with eyes open or closed.
  • The cross-correlation coefficient (CCC) between eye and head velocity was calculated and averaged to represent vestibular function.

Main Results:

  • Age was significantly and negatively correlated with mean CCC across all conditions (P<0.05).
  • Mean CCC with open eyes declined significantly in the 55-65 year age group.
  • Mean CCC with closed eyes declined significantly in the 65-75 year age group.

Conclusions:

  • Vestibular function, assessed by mean CCC, declines with advancing age.
  • The visual-vestibulo-ocular reflex shows a decline approximately 10 years earlier than the vestibulo-ocular reflex.