EFFECT OF THE ACOUSTIC REFLEX ON INNER-EAR DAMAGE INDUCED BY INDUSTRIAL NOISE
EFFECT OF THE ACOUSTIC REFLEX ON INNER-EAR DAMAGE INDUCED BY INDUSTRIAL NOISE
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DOI：
10.3109/00016488309132721
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发表时间：
1983-01-01
影响因子：
1.4
通讯作者：
ENGSTROM, B
中科院分区：
文献类型：
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作者：
BORG, E;NILSSON, R;ENGSTROM, B
船厂噪声是一种可变噪声，可引起作业工人永久性阈移。在人类中，已经发现镫骨肌反射在这种类型的暴露中非常稳定。暂时性阈值移位（TTS）在镫骨肌反射的情况下，被发现向下延伸通过语音频率，而不是显示一个高频下降时，镫骨肌反射是正常的。本实验观察了同种噪声在有和无中耳肌功能的家兔上产生的PTS的特点。用听性脑干反应（ABR）和镫骨肌反射反应测定听觉灵敏度。中耳肌肉功能被阻断的镫骨肌去神经或全身麻醉。在正常中耳反射时，PTS很小，当肌肉在噪声暴露期间失活时，PTS非常广泛，覆盖了中频范围。显然，镫骨肌反射的特点，应考虑在评估个人易感性和设计最佳的声环境。
Shipyard noise is a variable noise which induces permanent threshold shift (PTS) in exposed workers. In humans, the stapedius reflex has been found to be very stable in this type of exposure. Temporary threshold shift (TTS) in the absence of stapedius reflex was found to extend downwards through the speech-frequencies instead of showing a high frequency dip as when the stapedius reflex is normal. The features of PTS produced by the same type of noise was investigated in rabbits with and without functioning middle ear muscles. The auditory sensitivity was measured by auditory brain stem response (ABR) and by the stapedius reflex response. Middle ear muscle function was blocked by denervation of the stapedius muscle or by general anesthesia. With normal middle ear reflex very little PTS was found. When the muscles were inactivated during the noise exposure the PTS was very extensive and covered the mid frequency range. Apparently, the features of the stapedius reflex should be considered both in assessment of individual susceptibility and design of optimal acoustic environments.