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Studies of asymptotic TTS.

Authors
Ward-WD
Source
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
Link
NIOSHTIC No.
00036564
Abstract
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.
Keywords
NIOSH-Grant; Audiometry; Exposure-limits; Hearing-impairment; Sound-levels; Hearing-loss; Noise-control; Sound-frequency; Auditory-fatigue
Contact
Otolaryngology, U of Minnesota Box 461 Mayo Minneapolis, Minn 55455
Publication Date
19750509
Document Type
Conference/Symposia Proceedings
Funding Amount
290004
Funding Type
Grant
Fiscal Year
1975
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-00350
Source Name
Effects of Long Duration Noise Exposure on Hearing and Health, AGARD Aerospace Medical Panel Specialist Meeting, May 5-9, 1975, Toronto, Canada
State
MN
Performing Organization
University of Minnesota Minneapolis, Minneapolis, Minnesota
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