Hearing loss from interrupted, intermittent, and time varying non-Gaussian noise exposure: The applicability of the equal energy hypothesis
Hearing loss from interrupted, intermittent, and time varying non-Gaussian noise exposure: The applicability of the equal energy hypothesis
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DOI：
10.1121/1.2775160
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发表时间：
2007-10-01
影响因子：
2.4
通讯作者：
Davis, Bob
中科院分区：
文献类型：
--
作者：
Hamernik, Roger P.;Qiu, Wei;Davis, Bob
16组龙猫(N=140)暴露于100dB(A)或103dB(A)SPL的不同等能量噪声范例中。11组接受间断、间歇和时变(IITV)的非高斯暴露，由峰度统计进行量化。IITV的曝光持续了3周，每天8小时，每周5天，旨在模拟工业工作周的一些基本特征。5个等值能量参照组暴露于高斯型或非高斯型5天、24小时/天的连续噪声。用诱发电位估计听阈值，并用Corti器官表面准备来量化感觉细胞数量。对于同等能量和峰度的IITV暴露，水平的时间变化不会改变创伤，在某些情况下，IITV暴露产生的结果与连续暴露5天的结果相似。在固定能量下，任何峰度的增加都伴随着噪音引起的创伤的增加。这些结果表明，如果考虑到幅度分布的峰度，等能量假设是一种可以接受的评估听力保护目的噪声暴露的方法。噪音水平的时间变化似乎对创伤几乎没有影响。(C)2007年美国声学学会。
Sixteen groups of chinchillas (N= 140) were exposed to various equivalent energy noise paradigms at 100 dB(A) or 103 dB(A) SPL. Eleven groups received an interrupted, intermittent, and time varying (IITV) non-Gaussian exposure quantified by the kurtosis statistic. The IITV exposures, which lasted for 8 h/day, 5 days/week for 3 weeks, were designed to model some of the essential features of an industrial workweek. Five equivalent energy reference groups were exposed to either a Gaussian or non-Gaussian 5 days, 24 h/day continuous noise. Evoked potentials were used to estimate hearing thresholds and surface preparations of the organ of Corti quantified the sensory cell population. For IITV exposures at an equivalent energy and kurtosis, the temporal variations in level did not alter trauma and in some cases the IITV exposures produced results similar to those found for the 5 day continuous exposures. Any increase in kurtosis at a fixed energy was accompanied by an increase in noise-induced trauma. These results suggest that the equal energy hypothesis is an acceptable approach to evaluating noise exposures for hearing conservation purposes provided that the kurtosis of the amplitude distribution is taken into consideration. Temporal variations in noise levels seem to have little effect on trauma. (c) 2007 Acoustical Society of America.