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Sound Intensity Level

Sound Intensity Level

Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and hence a...

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Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

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Navy hearing conservation program: hearing threshold comparisons to Navy SEALS and divers.

B Bohnker¹, G Rovig, J Page

¹Navy Environmental Health Center, 620 John Paul Jones Circle, Suite 1100, Portsmouth, VA 23708, USA.

Undersea & Hyperbaric Medicine : Journal of the Undersea and Hyperbaric Medical Society, Inc

|September 11, 2003

Summary

Navy special operations personnel, including Sea-Air-Land (SEALS) and divers, show distinct hearing threshold risks. SEALS face higher risks at 4000 Hz, while both groups have lower risks in specific frequency ranges.

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Area of Science:

Occupational health
Auditory science
Military medicine

Background:

Hearing loss is a significant concern for military personnel due to occupational noise exposure.
Understanding specific risks for special operations forces is crucial for effective hearing conservation programs.

Purpose of the Study:

To compare hearing thresholds between Navy special operations personnel (SEALS and divers).
To identify specific frequency ranges and risk levels associated with each group.

Main Methods:

Hearing threshold data collected from 212 SEALS and 165 divers.
Age adjustment of hearing threshold values using Mantel Haenzel Weighted odds ratio (MHOR).
Comparison with the Navy Hearing Conservation Database.

Main Results:

SEALS showed significantly lower risk for thresholds above 20 dB (500-3000 Hz) in the right ear (MHOR=0.54, p=0.022).
Divers showed significantly lower risk for thresholds above 20 dB (500-3000 Hz) in the left ear (MHOR=0.61, p=0.047).
SEALS exhibited significantly higher risk for thresholds above 40 dB at 4000 Hz in both ears (left MHOR=2.03, p=0.0043; right MHOR=2.58, p=0.000089), while divers did not differ.

Conclusions:

Hearing risk profiles differ between SEALS and divers, particularly at 4000 Hz.
Risk assessment must account for unique mission demands and exposure hazards.
Acceptability of hearing risks may be determined by mission requirements in hazardous environments.