EAR CANAL VOLUME AND VARIABILITY IN THE PATTERNS OF TEMPORARY THRESHOLD SHIFTS
EAR CANAL VOLUME AND VARIABILITY IN THE PATTERNS OF TEMPORARY THRESHOLD SHIFTS
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DOI：
10.1097/00003446-198712000-00005
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发表时间：
1987-12-01
期刊：
影响因子：
3.7
通讯作者：
MOUL, ML
中科院分区：
文献类型：
--
作者：
GERHARDT, KJ;RODRIGUEZ, GP;MOUL, ML
耳道共振被认为是过度暴露在噪音中导致3.0至6.0千赫区域听力显著丧失的原因。在56名受试者中，确定了最大暂时性阈值漂移(TTS)频率和耳道物理测量之间的关系。TTS是通过两次单独暴露在持续2小时或20分钟的宽带噪声中产生的。根据导纳鼓室图估计耳道体积，测量耳道开口直径，计算耳道长度。30名受试者的TTS在4.0 kHz时最大，17名和9名受试者在3.0 kHz和6.0 kHz时最大。根据最大TTS频率分组的受试者，平均耳道体积被发现有显著差异。体积越大的受试者在3.0 kHz时损失最大的可能性越大。因此，耳道体积较小的受试者在6.0 kHz时听力损失最大。耳道体积和计算长度(共振)之间存在显著的相关性。此外，TTS的最大频率与音量以及TTS与长度之间也存在适度的相关性。
Ear canal resonance is thought to be responsible for the prominent loss of hearing in the 3.0 to 6.0 kHz region caused by overexposure to noise. Relationships were identified between frequency-of-maximum temporary threshold shift (TTS) and physical measurements of the ear canal in 56 subjects. TTSs were produced by two separate exposures to broadband noise of either 2 hr or 20 minute duration. Ear canal volume was estimated from admittance tympanograms, diameter of the canal opening was measured, and canal length was calculated. Thirty subjects suffered the greatest TTS at 4.0 kHz, while 17 and 9 subjects had the greatest shift at 3.0 and 6.0 kHz, respectively. With subjects grouped according to frequency-of-maximum TTS, mean ear canal volume was found to be significantly different. Subjects with larger volumes were more likely to suffer the greatest loss at 3.0 kHz. Accordingly, subjects with smaller ear canal volumes suffered peak hearing loss at 6.0 kHz. Significant correlations were identified between ear canal volume and calculated length (resonance). Also, modest correlations were noted between frequency-of-maximum TTS and volume as well as TTS and length.