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Hearing loss from interrupted, intermittent, and time varying Gaussian noise exposures: the applicability of the equal energy hypothesis.

Authors
Qiu-W; Davis-B; Hamernik-RP
Source
J Acoust Soc Am 2007 Mar; 121(3):1613-1620
NIOSHTIC No.
20031795
Abstract
Eight groups of chinchillas (N=74) were exposed to various equivalent energy [100 or 106 dB(A) sound pressure level (SPL)] noise exposure paradigms. Six groups received an interrupted, intermittent, time varying (IITV) Gaussian noise exposure that lasted 8 h/d, 5 d/week for 3 weeks. The exposures modeled an idealized workweek. At each level, three different temporal patterns of Gaussian IITV noise were used. The 100 dB(A) IITV exposure had a dB range of 90-108 dB SPL while the range of the 106 dB(A) IITV exposure was 80-115 dB SPL. Two reference groups were exposed to a uniform 100 or 106 dB(A) SPL noise, 24 h/d for 5 days. Each reference group and the three corresponding IITV groups comprised a set of equivalent energy exposures. Evoked potentials were used to estimate hearing thresholds and surface preparation histology quantified sensory cell populations. All six groups exposed to the IITV noise showed threshold toughening effects of up to 40 dB. All IITV exposures produced hearing and sensory cell loss that was similar to their respective equivalent energy reference group. These results indicate that for Gaussian noise the equal energy hypothesis for noise-induced hearing loss is an acceptable unifying principle.
Keywords
Noise-induced-hearing-loss; Animal-studies; Cell-damage; Noise-exposure; Ear-disorders; Industrial-noise; Impulse-noise; Hearing-loss; Laboratory-animals
Contact
Auditory Research Laboratory, State University of New York, 107 Beaumont Hall, Plattsburgh, New York 12901
CODEN
JASMAN
Publication Date
20070301
Document Type
Journal Article
Email Address
wei.qiu@plattsburgh.edu
Funding Amount
2829511
Funding Type
Grant
Fiscal Year
2007
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-02317
Issue of Publication
3
ISSN
0001-4966
Source Name
Journal of the Acoustical Society of America
State
NY
Performing Organization
Communicative Disorders & Scis Research Foundation of Suny P O Box 9 Albany, N Y 12201
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