Hearing Loss from Interrupted, Intermittent, and Time Varying Non-Gaussian Noise Exposure: The Applicability of the Equal Energy Hypothesis

Details

• Personal Author:
  Davis B ; Hamernik RP ; Qiu W ; Davis B ; Hamernik RP ; Qiu W
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Animals Ear Hearing Hearing Loss Hearing Loss, Noise-Induced Laboratories Noise Noise, Occupational Occupational Health Safety Sense Organs

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• Keywords:
  Animal-studies Cell-damage Cell-function Ear-disorders Hearing-disorders Hearing-impairment Hearing-loss Hearing-threshold Impulse-noise Industrial-noise Laboratory-animals Mathematical-models Noise-exposure Noise-induced-hearing-loss Noise-measurement Quantitative-analysis Traumatic-injuries

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• ISSN:
  0001-4966
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article ; Journal Article
• Place as Subject:
  New York ; OSHA Region 2
• CIO:
  National Institute for Occupational Safety and Health (NIOSH) ; National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health ; Workplace Safety & Health
• Location:
  North America ; North America
• Volume:
  122
• Issue:
  4
• NIOSHTIC Number:
  nn:20032934
• Citation:
  J Acoust Soc Am 2007 Oct; 122(4):2245-2254
• Contact Point Address:
  Roger Hamernik, Auditory Research Laboratory, State University of New York, 107 Beaumont Hall, Plattsburgh, New York 12901
• Email:
  roger.hamernik@plattsburgh.edu
• Federal Fiscal Year:
  2008
• NORA Priority Area:
  Construction ; Manufacturing ; Construction ; Manufacturing
• Performing Organization:
  Plattsburgh State University, New York
• Peer Reviewed:
  True
• Start Date:
  19860301
• Source Full Name:
  Journal of the Acoustical Society of America
• End Date:
  20130514
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:524e615a90c34224450dbc59b98caf24a123a5470947ea2d27e2c9fe7050d44aa5edebb14626a1022bd776c5f69dbf7d75586a5a049eac6b62c88d9ae899a570
• Download URL:
  https://stacks.cdc.gov/view/cdc/186714/cdc_186714_DS1.pdf
• File Type:
  [PDF - 655.20 KB ]