摘要
目的 观察适应性噪声暴露对听力的保护作用。方法 将 44名青年志愿者随机分为 4组 (每组1 1人 ,男 6人、女 5人 ) ,其中 2组为适应性暴露组 ,另 2组为直接暴露组。适应性暴露 1组和 2组先暴露于中心频率为 0 5kHz、声压级为 95dBSPL的一个倍频程噪声 ,每天 6h ,连续暴露 1 0d ,休息 2d后 ,再连续3d分别暴露于声压级为 1 0 5dB的一个倍频程噪声 (2 5h/d)和白噪声 (0 5h/d) ;而直接暴露的两组预先不进行适应性暴露 ,直接暴露于 1 0 5dB的一个倍频程噪声和白噪声 ,连续 3d ,每天 2 5h。以暂时性听阈位移 (TTS)作为观察指标。结果 在高噪声暴露过程中 ,适应性暴露组与直接暴露组相比 ,除 8kHz外 ,TTS在各个频率上差异均有显著性。结论 经过一定强度噪声的适应性暴露后 ,能够减轻更高强度噪声所致听力损伤的程度。
Objective\ To study the conservative effect of noise conditioning on acoustic system of human being.Methods\ 44 young volunteers were randomly and equally divided into four groups with 6 males and 5 females in each group.Two groups were taken as noise conditioning groups,and the other two as directly exposed groups exposed directly to damaging noise.Conditioning group 1 and 2 were subjected to 95 dB SPL OBN(centered at 0\^5 kHz,6 h/d)for 10 days.After an intermittence of 2 days,both groups were exposed to 105 dB SPL OBN(2\^5 h/d)and white noise(0\^5 h/d) for 3 days,respectively.The directly exposed groups were exposed to intense sound(105 dB SPL)without conditioning exposure.Temporary threshold shift(TTS)was tested as the index.Results\ The values of TTS were significantly different between conditioning groups and directly exposed groups at all frequency except 8 kHz.Conclusions\ After noise conditioning,the acoustic system acquired resistance to high intensity damaging noise.
出处
《工业卫生与职业病》
CAS
CSCD
北大核心
2002年第2期77-79,共3页
Industrial Health and Occupational Diseases
关键词
噪声适应性暴露
噪声习服
暂时性听阈位移
听力保护
Noisc exposure
Sound conditioning
Temporary threshold shift
Acoustic conservation
