The Application of the Equal Energy Hypothesis (EEH) to Interrupted, Intermittent, and Time-Varying Non-Gaussian Noise Exposures

Details

• Personal Author:
  Davis RI ; Hamernik RP ; Qiu W
• Description:
  Industrial data and animal research show that non-Gaussian (nonG) noise exposures are more hazardous to hearing than energy equivalent Gaussian (G) exposures. A statistical metric, kurtosis [b(t)], was shown to order the severity of noise-induced trauma following a nonG exposure relative to an energy and spectrally equivalent G exposure. Four groups of chinchillas were exposed to one of four different nonG interrupted, intermittent, and time-varying (IITV) noise paradigms over 19 days at an Leq=103 dB(A) SPL, with b(t)=25 or 50. Each daily exposure consisted of two 4.25-h periods with an hour break. Each 4.25-h exposure was interrupted for 15 min and each 5-day sequence was separated by a 2-day break. Each daily IITV exposure followed one of two different SPL temporal patterns that varied between 90 and 108 dB(A). All IITV exposures produced a toughening effect that did not alter the degree of noise-induced trauma. NonG noise produced as much trauma as a G exposure at 110 dB. Despite very different temporal paterrns for the b(t)=50 exposures, trauma was the same. Thus within a common class [i.e., the same Leq and b(t)] of nonG, IITV exposure, the EEH may apply. [Description provided by NIOSH]
• Subjects:
  Animals Hearing Loss Hearing Loss, Noise-Induced Laboratories Noise Occupational Health Safety
• Keywords:
  Animal-studies Hearing-disorders Hearing-impairment Hearing-loss Laboratory-animals Models Noise-exposure Noise-induced-hearing-loss
• ISSN:
  0001-4966
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Abstract or Summary
• 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:
  120
• Issue:
  5
• NIOSHTIC Number:
  nn:20034179
• Citation:
  J Acoust Soc Am 2006 Nov; 120(5)(Pt 2):3128
• Contact Point Address:
  Wei Qiu, PhD, Auditory Research Laboratory, State University of New York at Plattsburgh, 101 Broad Street, Plattsburgh, New York, 12901
• Email:
  qiuw@plattsburgh.edu
• Federal Fiscal Year:
  2007
• NORA Priority Area:
  Disease and Injury: Hearing Loss
• Performing Organization:
  Plattsburgh State University
• Peer Reviewed:
  False
• Part Number:
  2
• Start Date:
  20040401
• Source Full Name:
  Journal of the Acoustical Society of America
• End Date:
  20060331
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:4e1313c52d5a7a25b0d7b0dd8952d63501985a5d23b06a2d7d2794ae283e97adabe106e9868b8e0daf647e89f7472caaad2e2445d27ec216e4aa9bab31c821d7
• Download URL:
  https://stacks.cdc.gov/view/cdc/189515/cdc_189515_DS1.pdf
• File Type:
  [PDF - 193.32 KB ]