Long-duration exposure to intermittent noises.
Aviat Space Environ Med
; 47(9): 987-90, 1976 Sep.
Article
en En
| MEDLINE
| ID: mdl-971180
ABSTRACT
The effects were examined of various patterns of interruption--of continuous noise by periods of quiet--on the growth and recovery of temporary threshold shift of hearing over an exposure period of 24 h. Monaural thresholds of hearing were measured prior to, during, and following exposure to a pink noise at a level of 85 dBA and to four conditions in which the pink noise was interrupted with various on-off ratios. The interrupted exposure patterns and levels were adjusted to make their average levels equivalent to 85 dBA. Among the results:
1) the growth of TTS clear.ly reached an asymptote for all interrupted exposure conditions, even when the TTS was as small as 5 dB, 2) the interrupted exposures produced lower asymptotic levels than the continuous exposure with the same amount of energy, and 3) the TTS recovery patterns were essentially the same at 1 h and beyond, for all conditions. These data support the concept that, following a long exposure, one should be provided at least as much time for recovery as the duration of the exposure.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Medicina Aeroespacial
/
Ruido
Límite:
Humans
/
Male
Idioma:
En
Revista:
Aviat Space Environ Med
Año:
1976
Tipo del documento:
Article