Influence of vibration of asymptotic threshold shift produced by impulse noise.
Hamernik-RP; Henderson-D; Coling-D; Salvi-R
Audiology 1981; 20(3):259-269
The potential interaction between low level impact noise and whole body vibration for a prolonged period of exposure was examined using 13 chinchillas as subjects. The monaural chinchillas were exposed for 10 day periods to one of the following conditions: whole body vibration at 30 hertz, 1 gram root mean square acceleration; impact noise at 113 decibels peak sound pressure level, once per second; or a combination of whole body vibration and impact noise. The results indicate that exposure to vibration was able to influence the etiology of hearing loss resulting from noise exposure. The influence of vibration was most pronounced at the lower frequencies. An increased hearing loss was noted in the combination group which could be found with even moderate levels of noise and vibration exposures. In order to be effective, the authors suggest that future hearing protection standards will have to take into consideration the complicating factors of vibration exposures. This will require a clearer understanding of the underlying rules of the vibration and noise interaction such as level, frequency and duration of the vibration and the noise.
NIOSH-Publication; NIOSH-Grant; Noise-induced-hearing-loss; Noise-exposure; Vibration-exposure; Industrial-noise; Laboratory-animals
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