NIOSHTIC-2 Publications Search
Studies of asymptotic TTS.
Effects of Long Duration Noise Exposure on Hearing and Health, AGARD Aerospace Medical Panel Specialist Meeting, May 5-9, 1975, Toronto, Canada. Langley Field, VA: National Aeronautics and Space Administration, 1975 May; :1-5
When ten young individuals with normal hearing were subjected to a series of 2-24 hour exposures to 4000 hertz, the asymptotic temporary threshold shift was always reached in 8-12 hours, with no suggestion of a sharp increase between 8 and 24 hours predicted by others. There was little difference in the rate of recovery from the temporary threshold shift produced by 8 and 24 hour exposures. The results suggest that exposures longer than 8 hours are not unusually hazardous per se, and that if there is an increased risk of eventual permanent damage from repeated daily exposures longer than 8 hours, it probably comes from the fact that as the daily exposure becomes longer than 8 hours the quiet interval before the next exposure must become shorter, so that the next day's exposure starts with the auditory system still in a fatigued state.
NIOSH-Grant; Audiometry; Exposure-limits; Hearing-impairment; Sound-levels; Hearing-loss; Noise-control; Sound-frequency; Auditory-fatigue
Otolaryngology, U of Minnesota Box 461 Mayo Minneapolis, Minn 55455
Effects of Long Duration Noise Exposure on Hearing and Health, AGARD Aerospace Medical Panel Specialist Meeting, May 5-9, 1975, Toronto, Canada
University of Minnesota Minneapolis, Minneapolis, Minnesota
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division