Impulse Noise Induced Hearing Loss from Simulated Work-Week Exposures

Details

• Personal Author:
  Hamernik RP ; Henderson D ; Hynson K
• Description:
  After preexposure thresholds had been determined, six adult monaural chinchillas were exposed to a repetitive, reverberant impulse for 8 hours per day, for 5 days. The noise impulses were produced by two automated, cam driven, brass hammers hitting a steel plate. Thresholds were measured at 0.25, 0.5, 1, 2, 4, and 8 kilohertz (kHz) 0.5 hour before and 0.5 hour after each of the five 8 hour exposures. After the last exposure the recovery of threshold was monitored for 5 successive days. Final hearing thresholds were obtained starting at 30 days postexposure and were either the average of 3 days of averaged evoked response (AER) testing or 10 days of behavioral testing. The AER thresholds were systematically higher than the behavioral thresholds by 5 to 18 decibels. All frequencies were shifted by approximately the same amount by the end of the 5 day exposure as they were at the end of the first day's exposure, and there was no cumulative effect. There was still some residual threshold shift with 2 days' recovery. The actual degree of oscillation of threshold presumably would be a function of the actual noise exposure as well as the acoustic environment during recovery. [Description provided by NIOSH]
• Subjects:
  Hearing Hearing Loss, Noise-Induced Laboratories Occupational Health Safety Sense Organs
• Keywords:
  Hearing-threshold Laboratory-animals NIOSH-Grant Noise-induced-hearing-loss Sensory-thresholds
• Series:
  Grant Final Reports
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Final Grant Report
• Place as Subject:
  New York ; OSHA Region 2
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  OEP - Office of Extramural Programs
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-25
• NIOSHTIC Number:
  nn:00197927
• NTIS Accession Number:
  PB91-185207
• Citation:
  Department of Otolaryngology and Communication Sciences, State University of New York, Upstate Medical Center, Syracuse, New York, 1981 Jan; :1-25
• Contact Point Address:
  Otolaryngology Upstate Medical Center Departm 750 E Adams Street Syracuse, N Y 13210
• Federal Fiscal Year:
  1981
• NORA Priority Area:
  Disease and Injury: Hearing Loss
• Performing Organization:
  Upstate Medical Center, Syracuse, New York
• Peer Reviewed:
  False
• Start Date:
  19720501
• Source Full Name:
  Department of Otolaryngology and Communication Sciences, State University of New York, Upstate Medical Center, Syracuse, New York
• End Date:
  19800630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:c93900b80d1dec3ab702d1e534d56d8c091b79f59e218556d32dfc5084495fd3fc11da3e8ed2e1dc05d67b6e67d52f560c997fe9007fe736ce50eba68d094d9b
• Download URL:
  https://stacks.cdc.gov/view/cdc/217790/cdc_217790_DS1.pdf
• File Type:
  [PDF - 1.21 MB ]