Six monaural chinchillas were exposed to a repetitive, reverberant, impulse noise for a total of five days, 8 h per day. The average peak overpressure within the holding cage was 113 dB. The reverberation time (pressure fluctuation envelope within 20 dB of peak) was 160 ms. Auditory thresholds were measured at 0.25, 0.5, 1, 2, 4, and 8 kHz before and after each day’s exposure using either the average‐evoked response technique or shock avoidance conditioning. After the last exposure, recovery was monitored for five successive days. Final thresholds were obtained starting at 30 days postexposure after which the animals were sacrificed for cochlear histology. The high frequencies (4, 8 kHz) showed a daily median shift of 40 dB and a 27 dB recovery before the following day’s exposure. The low frequencies (0.25, 0.5 kHz) were shifted 35 dB after each day’s exposure with a 15 dB recovery overnight. Final median audiograms showed little permanent threshold shift. The cochleagrams for two test animals were found to be normal while the remaining four displayed 10%–40% losses in hair cells at specific cochlear sites.
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May 1979
May 01 1979
Hearing loss from simulated work‐week exposure to impulse noise
D. Henderson;
D. Henderson
Department of Otolaryngology and Communication Sciences, State University of New York, Upstate Medical Center, Syracuse, New York 13210
Department of Mechanical and Aerospace Engineering, Syracuse University, Syracuse, New York 13210
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R. P. Hamernik;
R. P. Hamernik
Department of Otolaryngology and Communication Sciences, State University of New York, Upstate Medical Center, Syracuse, New York 13210
Department of Mechanical and Aerospace Engineering, Syracuse University, Syracuse, New York 13210
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K. Hynson
K. Hynson
Department of Otolaryngology and Communication Sciences, State University of New York, Upstate Medical Center, Syracuse, New York 13210
Department of Mechanical and Aerospace Engineering, Syracuse University, Syracuse, New York 13210
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J. Acoust. Soc. Am. 65, 1231–1237 (1979)
Citation
D. Henderson, R. P. Hamernik, K. Hynson; Hearing loss from simulated work‐week exposure to impulse noise. J. Acoust. Soc. Am. 1 May 1979; 65 (5): 1231–1237. https://doi.org/10.1121/1.382790
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