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[Temporary threshold shift from equal energy intermittent noises].

T Yamamoto, K Takagi, K Hiramatsu

    Sangyo Igaku. Japanese Journal of Industrial Health
    |May 1, 1985
    PubMed
    Summary
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    Temporary threshold shifts (TTSs) from intermittent noise increase with longer on-times, challenging the equal energy assumption. Models may need adjustment for predicting TTS from noise with bursts over 200 ms.

    Area of Science:

    • Audiology
    • Acoustics
    • Occupational Health

    Context:

    • Understanding temporary threshold shifts (TTSs) is crucial for hearing protection.
    • Intermittent noise exposure is common in various occupational and recreational settings.
    • The energy equivalence principle is often used to predict noise-induced hearing damage.

    Purpose:

    • To investigate the impact of varying intermittent white noise on-times on TTS.
    • To compare TTS induced by intermittent noise with continuous noise of equal energy.
    • To evaluate the validity of the equal energy assumption for intermittent noise prediction.

    Summary:

    • Seven participants with normal hearing were exposed to continuous and intermittent white noise (25-800 ms on-times) for 40 minutes.
    • TTS was measured at 3, 4, and 6 kHz at 10, 20, and 40 minutes post-exposure.

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  • Significant TTS differences were observed, increasing notably with on-times exceeding 100-200 ms.

    • Impact:

    • Findings suggest the equal energy assumption may be insufficient for predicting TTS from intermittent noise.
    • The on-fraction rule and unit-step-function method show potential for predicting TTS from intermittent noise with longer bursts.
    • This research informs better models for noise-induced hearing loss prevention.