کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4356025 1615653 2008 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Impact of occupational noise on pure-tone threshold and distortion product otoacoustic emissions after one workday
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی سیستم های حسی
پیش نمایش صفحه اول مقاله
Impact of occupational noise on pure-tone threshold and distortion product otoacoustic emissions after one workday
چکیده انگلیسی
The aim of this study was to investigate whether distortion product otoacoustic emissions (DPOAEs) are a suitable means for detecting small changes in cochlear amplifier functionality due to occupational noise exposure of one workday and whether efferent reflex strength of the medial olivocochlear bundle is able to predict the ear's susceptibility to noise. High-resolution (Δf2 = 47 Hz) DPOAEs were recorded between 3.5 and 4.5 kHz at close-to-threshold primary tone levels. For comparison, pure-tone audiometry was conducted. Efferent reflex strength was measured by means of DPOAEs at a specific frequency with and without contralateral acoustic stimulation. A statistically significant change was found for pure-tone thresholds (ΔLht = +1.6 ± 3.0 dB, n = 155) and DPOAE levels (ΔLdp = −1.0 ± 2.4 dB, n = 646; L2 = 20 dB SPL) in factory workers but not in office workers (ΔLht = −1.3 ± 3.3 dB, n = 80; ΔLdp = 0.0 ± 1.6 dB, n = 336) (control group). However, the influence of systematic biases due to, e.g. ear probe calibration or measurement sequence effects, has to be considered. Moreover, there was no significant correlation between efferent reflex strength and shifts in pure-tone thresholds or shifts in DPOAE levels. Thus, the applied measures of efferent reflex strength do not seem to be suitable for predicting temporary changes in hearing capability.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hearing Research - Volume 246, Issues 1–2, December 2008, Pages 9-22
نویسندگان
, ,