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

Authors
Hamernik-RP; Qiu-W; Davis-B
Source
J Acoust Soc Am 2007 Oct; 122(4):2245-2254
NIOSHTIC No.
20032934
Abstract
Sixteen groups of chinchillas (N=140) were exposed to various equivalent energy noise paradigms at 100 dB(A) or 103 dB(A) SPL. Eleven groups received an interrupted, intermittent, and time varying (IITV) non-Gaussian exposure quantified by the kurtosis statistic. The IITV exposures, which lasted for 8 hday, 5 daysweek for 3 weeks, were designed to model some of the essential features of an industrial workweek. Five equivalent energy reference groups were exposed to either a Gaussian or non-Gaussian 5 days, 24 hday continuous noise. Evoked potentials were used to estimate hearing thresholds and surface preparations of the organ of Corti quantified the sensory cell population. For IITV exposures at an equivalent energy and kurtosis, the temporal variations in level did not alter trauma and in some cases the IITV exposures produced results similar to those found for the 5 day continuous exposures. Any increase in kurtosis at a fixed energy was accompanied by an increase in noise-induced trauma. These results suggest that the equal energy hypothesis is an acceptable approach to evaluating noise exposures for hearing conservation purposes provided that the kurtosis of the amplitude distribution is taken into consideration. Temporal variations in noise levels seem to have little effect on trauma.
Keywords
Noise-induced-hearing-loss; Animal-studies; Cell-damage; Noise-exposure; Ear-disorders; Industrial-noise; Impulse-noise; Hearing-loss; Laboratory-animals; Noise-measurement; Mathematical-models; Quantitative-analysis; Cell-function; Hearing; Hearing-impairment; Hearing-loss; Hearing-threshold; Hearing-disorders; Traumatic-injuries
Contact
Roger Hamernik, Auditory Research Laboratory, State University of New York, 107 Beaumont Hall, Plattsburgh, New York 12901
CODEN
JASMAN
Publication Date
20071001
Document Type
Journal Article
Email Address
roger.hamernik@plattsburgh.edu
Funding Amount
2829511
Funding Type
Grant
Fiscal Year
2008
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-02317
Issue of Publication
4
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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