Stephenson M R, Nixon C W, Johnson D L
Aviat Space Environ Med. 1980 Apr;51(4):391-6.
The present study was designed to identify the minimum noise level capable of producing an asymptotic temporary threshold shift (ATTS). It was estimated that at some level below 85 dBA, probably 70-80 dBA, there existed an exposure level at which no ATTS would occur. It is assumed that if a long-duration noise does not produce temporary changes in hearing levels, then it would not produce permanent changes either. This level would then define an exposure condition below which personnel could be exposed for indefinite periods of time without adverse auditory effects. Subjects were exposed to continuous pink noise for 24 h at levels of 65, 70, 75, 80, and 85 dBA. TTS growth and recovery was measured at specific intervals throughout each condition. Results demonstrate that at the most sensitive frequency (4000 Hz), at ATTS threshold level would be predicted in the region of 75-80 dBA.
本研究旨在确定能够产生渐近性暂时阈移（ATTS）的最低噪声水平。据估计，在低于85分贝A的某个水平，可能是70 - 80分贝A，存在一个不会发生ATTS的暴露水平。假定如果长时间噪声不会引起听力水平的暂时变化，那么它也不会引起永久性变化。这个水平将定义一种暴露条件，在此条件下人员可以无限期暴露而不会产生不良听觉影响。受试者在65、70、75、80和85分贝A的水平下暴露于连续粉红噪声24小时。在每种条件下的特定间隔测量TTS的增长和恢复情况。结果表明，在最敏感频率（4000赫兹），ATTS阈值水平预计在75 - 80分贝A范围内。
