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Impulse noise induced hearing loss from simulated work-week exposures.

Authors
Henderson-D; Hamernik-RP; Hynson-K
Source
Department of Otolaryngology and Communication Sciences, State University of New York, Upstate Medical Center, Syracuse, New York, 1981 Jan; :1-25
Link
NIOSHTIC No.
00197927
Abstract
After preexposure thresholds had been determined, six adult monaural chinchillas were exposed to a repetitive, reverberant impulse for 8 hours per day, for 5 days. The noise impulses were produced by two automated, cam driven, brass hammers hitting a steel plate. Thresholds were measured at 0.25, 0.5, 1, 2, 4, and 8 kilohertz (kHz) 0.5 hour before and 0.5 hour after each of the five 8 hour exposures. After the last exposure the recovery of threshold was monitored for 5 successive days. Final hearing thresholds were obtained starting at 30 days postexposure and were either the average of 3 days of averaged evoked response (AER) testing or 10 days of behavioral testing. The AER thresholds were systematically higher than the behavioral thresholds by 5 to 18 decibels. All frequencies were shifted by approximately the same amount by the end of the 5 day exposure as they were at the end of the first day's exposure, and there was no cumulative effect. There was still some residual threshold shift with 2 days' recovery. The actual degree of oscillation of threshold presumably would be a function of the actual noise exposure as well as the acoustic environment during recovery.
Keywords
NIOSH-Grant; Noise-induced-hearing-loss; Laboratory-animals; Sensory-thresholds; Hearing-threshold
Contact
Otolaryngology Upstate Medical Center Departm 750 E Adams Street Syracuse, N Y 13210
Publication Date
19810101
Document Type
Final Grant Report
Funding Amount
651569
Funding Type
Grant
Fiscal Year
1981
NTIS Accession No.
PB91-185207
NTIS Price
A03
Identifying No.
Grant-Number-R01-OH-00364
NIOSH Division
OEP
Priority Area
Noise-induced-hearing-loss
Source Name
Department of Otolaryngology and Communication Sciences, State University of New York, Upstate Medical Center, Syracuse, New York
State
NY
Performing Organization
Upstate Medical Center, Syracuse, New York
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