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Noise-induced Hearing Loss: Continuous versus Impact/impulse Noise
Mohammad Hossein Davari1, Mohammad Taghi Jalalian1, Seyyed Jalil Mirmohammadi1
1Industrial Diseases Research Center, ShahidSadoughi University of Medical Sciences, Yazd Province, Iran.
International Journal of Preventive Medicine
|March 15, 2024
Summary
Impact noise exposure may cause more frequent and severe noise-induced hearing loss (NIHL) than continuous noise. Both noise types similarly affect hearing patterns, with higher thresholds at 6000 Hz.
Area of Science:
- Occupational Health
- Audiology
- Environmental Health
Background:
- Noise-induced hearing loss (NIHL) is a significant workplace hazard.
- Impact/impulse noise and continuous noise are primary contributors to NIHL.
Purpose of the Study:
- To compare the effects of impulse/impact noise versus continuous noise on hearing status.
- To evaluate differences in hearing loss and audiometric notch frequency between noise exposure types.
Main Methods:
- 259 workers were divided into impact noise and continuous noise exposure groups.
- Pure-tone audiometry (PTA) was used to measure hearing thresholds.
- Statistical analysis included t-tests, Chi-square, and Mann-Whitney U tests.
Main Results:
- Hearing thresholds were significantly higher across all frequencies in the impact noise group.
- High-frequency hearing loss was more prevalent in the impact noise group.
- No significant difference in audiometric notch frequency was observed between groups.
Conclusions:
- Impact/impulse noise exposure may lead to more frequent and severe hearing loss than continuous noise.
- The pattern of hearing loss appears similar regardless of noise type.
- Further research may be needed to fully elucidate the long-term effects.
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