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

Details

• Personal Author:
  Davis B ; Hamernik RP ; Qiu W
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Animals Ear Hearing Loss Hearing Loss, Noise-Induced Laboratories Noise Noise, Occupational Occupational Health Safety Sense Organs
• Keywords:
  Animal-studies Cell-damage Ear-disorders Hearing-loss Impulse-noise Industrial-noise Laboratory-animals Noise-exposure Noise-induced-hearing-loss
• ISSN:
  0001-4966
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  New York ; OSHA Region 2
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  12
• Issue:
  3
• NIOSHTIC Number:
  nn:20031795
• Citation:
  J Acoust Soc Am 2007 Mar; 121(3):1613-1620
• Contact Point Address:
  Auditory Research Laboratory, State University of New York, 107 Beaumont Hall, Plattsburgh, New York 12901
• Email:
  wei.qiu@plattsburgh.edu
• Federal Fiscal Year:
  2007
• 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-512:1ef21e019ec0c4ae9ff3ed9285adac5e453556d8f46600287d70783e7c19657c61e6d1d8d099247ef26d419ffb733e9a3e8facae9ee45a16777801836360d843
• Download URL:
  https://stacks.cdc.gov/view/cdc/185952/cdc_185952_DS1.pdf
• File Type:
  [PDF - 803.75 KB ]