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Related Experiment Videos

Presbycusis and noise-induced permanent threshold shift.

J H Macrae1

  • 1National Acoustic Laboratories, Chatswood, Australia.

The Journal of the Acoustical Society of America
|November 1, 1991
PubMed
Summary
This summary is machine-generated.

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New research suggests International Standard ISO 1999 accurately combines age-related hearing loss (presbycusis) and noise-induced permanent threshold shift (NIPTS). Data does not support the additive model proposed by Bies and Hansen.

Area of Science:

  • Audiology
  • Occupational Health
  • Acoustics

Background:

  • The relationship between noise exposure and hearing impairment is critical for occupational health standards.
  • International Standard ISO 1999 provides a framework for assessing noise-induced hearing impairment.
  • Bies and Hansen proposed an alternative model assuming additive effects of presbycusis and NIPTS on an antilogarithm basis.

Purpose of the Study:

  • To evaluate the validity of the Bies and Hansen model for combining presbycusis and noise-induced permanent threshold shift (NIPTS).
  • To compare the Bies and Hansen model with the formulation in International Standard ISO 1999.

Main Methods:

  • Analysis of hearing threshold level data at 4000 Hz in war veterans with pre-existing NIPTS.
  • Comparison of observed hearing deterioration due to aging with predictions from both the Bies and Hansen model and ISO 1999.

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Main Results:

  • Data from war veterans did not support the additive assumption of the Bies and Hansen model.
  • The findings provided support for the method of combining presbycusis and NIPTS as presented in International Standard ISO 1999.

Conclusions:

  • The formulation in International Standard ISO 1999 for combining presbycusis and NIPTS is better supported by empirical data than the Bies and Hansen model.
  • Accurate models for hearing impairment are essential for setting appropriate noise exposure limits and protecting auditory health.