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Journal of Speech and Hearing Research Vol.39 251-260 April 1996.
© American Speech-Language-Hearing Association
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Noise Exposure Associated With Hearing Aid Use in Industry

Thomas G. Dolan 1
James F. Maurer 1
1 Portland State University Portland, OR

Although noise may be innocuous in many vocational environments, there is a growing concern in industry that it can reach hazardous levels when amplified by hearing aids. This study examined the daily noise exposures associated with hearing aid use in industry. This was done by both laboratory and site measurements in which hearing aids were coupled to the microphone of an integrating sound level meter or dosimeter. The former method involved the use of recorded railroad and manufacturing noise and a Bruel and Kjaer 4128 Head and Torso simulator. In the latter procedure, a worker wore one of three hearing aids coupled to a dosimeter during 8-hour shifts in a manufacturing plant. Both methods demonstrated that even when amplified by mild-gain hearing aids, noise exposures rose from time-weighted averages near 80 dBA to well above the OSHA maximum of 90 dBA. The OSHA maximum was also exceeded when moderate and high gain instruments were worn in non-occupational listening environments. The results suggest that current OSHA regulations that limit noise exposure in sound field are inappropriate for hearing aid users.

KEY WORDS: hearing aids, noise, industry, hearing loss

Submitted on October 7, 1994
Accepted on November 27, 1995


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