Grzesik J, Pluta E
Int Arch Occup Environ Health. 1986;57(2):137-42. doi: 10.1007/BF00381381.
This investigation was aimed at elucidating the dynamics of hearing loss in the range of 500 Hz to 20 kHz of 26 Ultrasonic (Uls)-operators exposed to high-frequency noise exceeding known hygienic limits. Results of audiometric tests performed twice, before and after a period of three years, were compared. The determined hearing-threshold-shift in the range of 500 Hz to 13 kHz could be explained as the effect of aging, whereas in the range of 13 to 17 kHz the stated mean threshold elevation of 2-5 dB, beyond the hearing loss connected with aging within three years, is the consequence of high-frequency noise exposure. On this basis the dynamics of high-frequency hearing loss of 1 dB/year in the case of continued exposure to high-frequency noise could be calculated. Apart from the observed threshold elevation, the fraction of ears responding to acoustic stimuli at the highest frequencies decreases by about 10% with frequency increase of 1 kHz in the range of 13 to 19 kHz. This indicates that the hearing organ is more susceptible to high-frequency noise at the highest hearing frequencies.
本研究旨在阐明26名暴露于超过已知卫生限值的高频噪声中的超声（Uls）操作员在500Hz至20kHz范围内听力损失的动态变化。比较了在三年前后进行的两次听力测试结果。在500Hz至13kHz范围内确定的听力阈值偏移可以解释为衰老的影响，而在13至17kHz范围内，所述平均阈值升高2 - 5dB，超过三年内与衰老相关的听力损失，是高频噪声暴露的结果。在此基础上，可以计算出在持续暴露于高频噪声的情况下每年1dB的高频听力损失动态变化。除了观察到的阈值升高外，在13至19kHz范围内，随着频率每增加1kHz，对最高频率声刺激有反应的耳朵比例下降约10%。这表明听觉器官在最高听力频率时对高频噪声更敏感。
