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Human temporary threshold shift (TTS) and damage risk.

W Melnick1

  • 1Department of Otalaryngology, Ohio State University, Columbus 43210.

The Journal of the Acoustical Society of America
|July 1, 1991
PubMed
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This review challenges the 1966 CHABA damage risk contours for noise exposure. Key assumptions regarding temporary threshold shift (TTS) recovery and hazard equivalence are invalidated by new data, suggesting contour revisions are needed.

Area of Science:

  • Audiology
  • Occupational Health
  • Acoustics

Background:

  • The 1966 CHABA damage risk contours provide guidelines for noise exposure limits.
  • These contours are based on postulates regarding temporary threshold shift (TTS) and permanent threshold shift (NIPTS).
  • Recent research necessitates a review of these established guidelines.

Purpose of the Study:

  • To review human temporary threshold shift (TTS) data in relation to steady-state and intermittent noise.
  • To evaluate the validity of the original CHABA damage risk contour postulates.
  • To identify areas for potential revision of noise exposure guidelines.

Main Methods:

  • Review of scientific literature published since 1966 concerning noise-induced hearing loss.
  • Focus on four key areas: long-duration exposure/asymptotic threshold shifts (ATS), equivalent safe noise levels, intermittency effects, and using TTS to predict NIPTS.

Related Experiment Videos

  • Analysis of experimental data on TTS recovery and hazard equivalence.

    • Main Results:

    • Two of the three primary postulates underlying the CHABA contours are not supported by current data.
    • Contrary to assumptions, recovery from TTS is dependent on the exposure conditions.
    • The assumption that equal TTS levels indicate equal hazard is unsubstantiated.

    Conclusions:

    • The original CHABA damage risk contours require revision based on new scientific evidence.
    • The hypothesis that asymptotic threshold shifts (ATS) represent an upper bound for permanent threshold shift (PTS) has a strong logical basis.
    • Further research is needed to confirm if ATS is a true asymptote and if threshold shifts stabilize post-exposure.