Ivanovich E, Goranova L
Probl Khig. 1992;17:70-6.
Study is performed on the effect of noise and local vibrations during a combined effect and independently on the auditory threshold for 4 kHz. The audiometric data of 1242 workers from the textile industry, coal- and ore production are analysed. On the basis of precise assessment of the noise level and occupational exposure to noise and local vibrations are formed 4 groups: exposed to independent noise effect with intensity 90 and 100 db (spinners and dressmakers); exposed to combined effect of noise (91 and 103 db) and local vibrations, surpassing the maximum admissible norms respectively 2.5 and 3.5 times (miners of coal- and ore production). In view of the occupational exposure and standardization concerning age and length of service the audiograms of 248 persons are examined. The following is established: different rate of increase of the auditory threshold for 4 kHz depending on the intensity of the factors noise and local vibrations in conditions of independent and combined effect: positive correlation with the length of service in the changes of the auditory sensoriness; dynamics in the increase of the auditory threshold for 4 KHz.
研究了噪声和局部振动单独作用以及联合作用时对4kHz听觉阈值的影响。分析了来自纺织行业、煤炭和矿石生产行业的1242名工人的听力测定数据。在精确评估噪声水平以及职业性噪声和局部振动暴露情况的基础上，将他们分为4组：暴露于强度为90和100分贝的单独噪声作用下的人员（纺纱工和裁缝）；暴露于噪声（91和103分贝）和局部振动联合作用下的人员，其局部振动分别超过最大允许标准2.5倍和3.5倍（煤炭和矿石生产行业的矿工）。考虑到职业暴露以及年龄和服务年限的标准化情况，对248人的听力图进行了检查。得出以下结论：在单独作用和联合作用条件下，4kHz听觉阈值随噪声和局部振动因素强度的增加速率不同；听觉敏感度变化与服务年限呈正相关；4kHz听觉阈值升高的动态变化情况。
