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Long-duration exposure to intermittent noises

D L Johnson, C W Nixon, M R Stephenson

Aviation, Space, and Environmental Medicine

|September 1, 1976

Summary

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Interrupted noise exposure significantly reduces hearing damage compared to continuous noise. Recovery time should match noise exposure duration for optimal hearing health.

Area of Science:

Audiology
Occupational Health
Acoustics

Background:

Noise-induced hearing loss is a significant occupational health concern.
Understanding the impact of noise exposure patterns on hearing is crucial for prevention.

Purpose of the Study:

To investigate the effects of intermittent noise exposure on hearing.
To compare temporary threshold shift (TTS) growth and recovery under continuous versus interrupted noise conditions.

Main Methods:

Monaural hearing thresholds were measured before, during, and after 24-hour exposure to pink noise (85 dBA).
Four interrupted noise conditions with varying on-off ratios were tested, all normalized to an 85 dBA average level.
Temporary threshold shift (TTS) was quantified for each exposure pattern.

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Main Results:

Interrupted noise exposures led to lower asymptotic levels of TTS compared to continuous exposure, even with equivalent energy.
TTS growth reached an asymptote in all interrupted exposure conditions.
Hearing recovery patterns were similar across all conditions after 1 hour.

Conclusions:

Intermittent noise exposure is less damaging to hearing than continuous exposure at equivalent average levels.
Adequate recovery time, at least equal to the exposure duration, is recommended after prolonged noise exposure.