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The aging-related decrease in cVEMP amplitude cannot be accounted for by normalization.

Maxime Maheu1,2, Mujda Nooristani2,3, Brahim Kaci1,3

  • 1Vestibulab, Université de Montréal, School of Speech Language Pathology and Audiology, Montreal, QC, Canada.

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Summary
This summary is machine-generated.

The decline in cervical Vestibular Evoked Myogenic Potentials (cVEMP) amplitude with aging is likely due to vestibular system changes, not pre-stimulation EMG differences. This finding is crucial for accurately categorizing healthy versus pathological responses in clinical settings.

Keywords:
EMGagingcVEMPsternocleidomastoid musclevestibular

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Area of Science:

  • Neuroscience
  • Audiology
  • Gerontology

Background:

  • Cervical Vestibular Evoked Myogenic Potentials (cVEMP) assess saccule function, with amplitude and asymmetry ratio as key parameters.
  • Pre-stimulus electromyography (EMG) levels can influence cVEMP amplitude, complicating age-related decline interpretations.
  • Aging affects both vestibular structures and muscle properties, creating a debate on the cause of reduced cVEMP amplitude.

Purpose of the Study:

  • To investigate if normalization alters cVEMP amplitude and asymmetry ratios differently in younger versus older healthy adults.
  • To clarify the role of EMG differences versus intrinsic aging effects on cVEMP parameters.

Main Methods:

  • cVEMP recordings were performed on 42 healthy participants (29 younger, 13 older).
  • Air-conducted cVEMP were elicited using 500 Hz tone bursts at 95 dBnHL.
  • EMG levels were monitored to ensure they remained between 50 μV and 150 μV during recordings.

Main Results:

  • No significant difference in pre-stimulus EMG levels was found between younger and older groups.
  • Significant differences in raw and corrected cVEMP amplitudes were observed between age groups.
  • A positive linear relationship between EMG and raw cVEMP amplitude was found in younger, but not older, adults.

Conclusions:

  • The decline in cVEMP amplitude with normal aging appears to be independent of pre-stimulation EMG differences.
  • Observed cVEMP amplitude reduction in older adults is likely attributable to age-related histopathological changes in the vestibular system.
  • These findings aid in distinguishing healthy aging from pathological conditions affecting saccule function.