高温与噪声的联合作用对玻璃制瓶工听力的影响

选择4组组间基本均衡的现场进行噪声和高温测试,分析4组研究对象听力水平的差异。对68名不同高温噪声暴露时间的玻璃制瓶工进行听力水平比较。结果发现,对语频听阈和高频听阈,单纯高温组与对照组相比差异无显著性(P>0.05),噪声组、高温噪声组与对照组相比差异有显著性(P<0.01),高温噪声组明显高于噪声组(P<0.01)。语频听阈和高频听阈随高温噪声暴露时间的延长而增高(P<0.01)。提示高温本身对语频听阈和高频听阈没有影响,但高温与噪声的联合作用可加重噪声对听力的损害,且可能具有时间依赖性。

Combined effects of heat and noise exposure on hearing of workers making glass bottles

Four groups of workers with equivalent environment conditions were selected and their levels of heat and noise stress were measured.Difference in their hearing was analyzed.Hearing was compared in 68 workers making glass bottles exposed to heat and noise environment for varied time.There was no significant difference in speech hearing threshold and high frequency hearing threshold between the group exposed to heat only and the control group(P>0.05),however,there was significant difference in them between the group exposed to noise only and the control group and between the group exposed to both heat and noise and the control group(P<0.01).Both speech hearing threshold and high frequency hearing threshold were much higher in the group exposed to both heat and noise than those in the group exposed to noise only(P<0.01).In addition,speech hearing threshold and high frequency hearing threshold increased with the length of exposure to both heat and noise environment(P<0.01).It is suggested that speech hearing threshold and high frequency hearing threshold can not be affected by heat stress,but hearing loss can be enhanced by the combined effect of exposure to both heat and noise,maybe in a time-dependent manner.