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Development of resistance to hearing loss from high frequency noise.

Authors
Subramaniam-M; Campo-P; Henderson-D
Source
Hear Res 1991 Nov; 56(1-2):65-68
NIOSHTIC No.
00206449
Abstract
The role of exposure frequency was investigated as it related to the development of progressive resistance to noise induced hearing loss. Six adult chinchillas were made monaural and exposed to an octave band of noise centered at 4 kilohertz (kHz) for 6 hours a day for 10 consecutive days at 85 decibels (dB) sound pressure level. Threshold measurements were made just prior to and after each exposure period. There were no significant post exposure threshold shifts at 0.5 or 1kHz. There was a 10dB shift on the first day at 2kHz; this was less than 5dB by 10 days. There was a 30 to 40dB shift for 4, 5.6 and 8kHz frequencies on the first day; this was reduced by 12dB at 4kHz and 24dB at 5.6 and 8kHz by 10 days. The threshold shift was found to be greatest on day one at all the tested frequencies. Thresholds returned to baseline values by 48 to 72 hours when exposures were discontinued. The results indicated that there was a decrease in threshold shifts with repeated exposures to high frequency noise. The authors conclude that toughening can be seen at high frequencies.
Keywords
NIOSH-Publication; NIOSH-Grant; Hearing-impairment; Noise-exposure; Laboratory-animals; Sensory-thresholds; Noise-induced-hearing-loss; Hearing-threshold; Noise-frequencies
CODEN
HERED3
Publication Date
19911101
Document Type
Journal Article
Funding Amount
2388849
Funding Type
Grant
Fiscal Year
1992
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-001152
Issue of Publication
1-2
ISSN
0378-5955
Priority Area
Noise-induced-hearing-loss
Source Name
Hearing Research
State
NY
Performing Organization
State University of New York, Buffalo, New York
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