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Related Experiment Videos

Longitudinal threshold changes in older men with audiometric notches.

G A Gates1, P Schmid, S G Kujawa

  • 1Department of Otolaryngology, Head and Neck Surgery, University of Washington School of Medicine, Seattle, WA, USA. ggats@u.washington.edu

Hearing Research
|March 14, 2000
PubMed
Summary

Noise-induced hearing notches significantly alter auditory aging. Ears with large notches showed greater 2 kHz hearing loss over 15 years, suggesting ongoing damage even after noise exposure ceases.

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Area of Science:

  • Audiology
  • Gerontology
  • Otolaryngology

Background:

  • Age-related hearing loss (presbycusis) is multifactorial, influenced by aging and cochlear noise damage.
  • Noise damage often presents as a high-frequency notch (3-6 kHz), while aging affects higher frequencies first.
  • The long-term impact of these notches on the aging auditory system remains unclear.

Purpose of the Study:

  • To investigate if pre-existing high-frequency notches influence the rate of auditory aging.
  • To analyze 15-year changes in audiometric thresholds in relation to notch presence and severity.

Main Methods:

  • Longitudinal study of 203 men from the Framingham Heart Study cohort over 15 years.
  • Audiometric thresholds were analyzed, categorizing ears into no notch (N0), small notch (N1: 15-34 dB), or large notch (N2: ≥35 dB) at 3-6 kHz.

Related Experiment Videos

  • Piecewise linear/parabolic curve fitting identified notches; age-adjusted threshold changes were assessed by notch category.

    • Main Results:

    • Notch presence correlated with noise exposure history.
    • Significant differences in 15-year audiometric threshold changes were observed across notch categories.
    • The N2 group (large notches) exhibited less change at notch frequencies (3-6 kHz) but significantly greater change at 2 kHz compared to N0 and N1 groups.

    Conclusions:

    • Noise-damaged ears do not age at the same rate as non-noise-damaged ears.
    • Increased hearing loss at 2 kHz in notched ears suggests noise damage effects may persist long after exposure.
    • Prior cochlear damage from noise may underlie these ongoing auditory changes.