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Safety limit warning levels for the avoidance of excessive sound amplification to protect against further hearing loss.

Objective: To determine safe output sound pressure levels (SPL) for sound amplification devices to preserve hearing sensitivity after usage. Design: A mathematical model consisting of the Modified Power Law (MPL) (Humes & Jesteadt, 1991) combined with equations for predicting temporary threshold shi...

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Published in:International Journal of Audiology Vol. 56; no. 11; pp. 829 - 837
Main Author: Johnson, Earl E.
Format: equations & formulas pictorial research tables/charts Journal Article
Published: Taylor & Francis Ltd Nov2017
Online Access:View this record in EBSCOhost
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        14992027
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      jtl: International Journal of Audiology
      issn: 14992027
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      dt: Nov2017
      vid: 56
      iid: 11
      pid: 377
      pub: Taylor & Francis Ltd
      place: Philadelphia, Pennsylvania
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        125436118
        125436118
        125436118
        10.1080/14992027.2017.1346306
        125436118
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        atl: Safety limit warning levels for the avoidance of excessive sound amplification to protect against further hearing loss.
      aug:
        au: Johnson, Earl E.
        affil: James H. Quillen VA Medical Center, Mountain Home, TN, USA
      sug:
        subj:
          Sound
          Hearing Disorders Therapy
          Disease Progression Prevention and Control
          Pressure (Physiology)
          Hearing Aids
          Equipment Safety
          Mathematics
          Audiometry
          Power
          Software
          Descriptive Statistics
          Human
          Speech Perception
          Multiple Regression
          P-Value
          Analysis of Variance
      ab: Objective: To determine safe output sound pressure levels (SPL) for sound amplification devices to preserve hearing sensitivity after usage. Design: A mathematical model consisting of the Modified Power Law (MPL) (Humes & Jesteadt, 1991) combined with equations for predicting temporary threshold shift (TTS) and subsequent permanent threshold shift (PTS) (Macrae, 1994b) was used to determine safe output SPL.Study sample: The study involves no new human subject measurements of loudness tolerance or threshold shifts. PTS was determined by the MPL model for 234 audiograms and the SPL output recommended by four different validated prescription recommendations for hearing aids.Results: PTS can, on rare occasion, occur as a result of SPL delivered by hearing aids at modern day prescription recommendations. The trading relationship of safe output SPL, decibel hearing level (dB HL) threshold, and PTS was captured with algebraic expressions. Better hearing thresholds lowered the safe output SPL and higher thresholds raised the safe output SPL.Conclusion: Safe output SPL can consider the magnitude of unaided hearing loss. For devices not set to prescriptive levels, limiting the output SPL below the safe levels identified should protect against threshold worsening as a result of long-term usage.
      pubtype: Academic Journal
      doctype:
        equations & formulas
        pictorial
        research
        tables/charts
        Journal Article
      ougenre: Article
    language: English
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