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目的探讨低强度噪声对作业人员身体的危害情况。方法使用声级计测定作业环境噪声强度,使用听力计测定接触低强度噪声[81.5～84.5dB(A)]某加工企业作业工人125人的听力,并调查作业人员的工龄,自觉症状(头晕,耳鸣,失眠,记忆力减退)及体检的心电图结果;采用不接触噪声的作业人员122人常规体检的结果作为对照。结果接触低强度噪声作业人员的噪声性高频听力损失率为25.2%,且随着工龄增长而高频听力损失率增加,各项自觉症状与对照组相比(P<0.01),差异有统计学意义;心电图结果与对照组相比(P>0.05),差异无统计学意义。结论长期暴露在低强度噪声下的作业人员,高频听力损失较严重,自觉症状很明显,为保护作业工人不发生职业性噪声聋及工伤事故发生,建议加强这类人员的个体防护。
Objective To explore the harm of low intensity noise to the workers. Methods The noise level of working environment was measured by using sound level meter. The hearing of 125 workers in a processing enterprise with low intensity noise [81.5 ~ 84.5dB (A)] was measured with an audiometer and the length of service, symptoms (dizziness, Tinnitus, insomnia, memory loss) and physical examination ECG results; non-noise workers 122 routine physical examination results as a control. Results The noise-induced high-frequency hearing loss rate of workers exposed to low-intensity noise was 25.2%, and the frequency of hearing loss increased with the increase of seniority. There were statistically significant differences between the subjective symptoms and the control group (P <0.01) Significance; ECG results compared with the control group (P> 0.05), the difference was not statistically significant. Conclusions Operators who have been exposed to low intensity noise for a long period of time have severe high frequency hearing loss and conspicuous symptoms. To protect working workers from occupational noise and occupational accidents, it is suggested to strengthen the individual protection of such workers.