Effect of Combined Exposure to Noise and Vibration on Hearing

This study was conducted to examine the effect(s) of combined exposure to whole-body vibration (WBV) and noise in railway workers. In this historical cohort study, train drivers with combined exposure to WBV and impermissible noise as the case group ( = 85) and shunters with just exposure to impermi...

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Bibliographic Details
Published in:	Indian journal of occupational and environmental medicine Vol. 23; no. 3; pp. 121 - 125
Main Authors:	Loukzadeh, Ziba, Shahrad, Soudabe, Shojaoddiny-Ardekani, Ahmad, Mehrparvar, Amir Houshang, Alamdarian, Majid
Format:	Journal Article
Language:	English
Published:	India Medknow Publications and Media Pvt. Ltd 01-09-2019 Medknow Publications & Media Pvt. Ltd Wolters Kluwer - Medknow
Subjects:	Diabetes Eardrum Ears & hearing Family medical history Health aspects Hearing loss Noise Noise pollution Occupational exposure Original Railroad employees Risk factors Safety and security measures Studies Vibration (Physics) India Iran noise standard threshold shift train drivers whole-body vibration Hearing loss
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Summary:	This study was conducted to examine the effect(s) of combined exposure to whole-body vibration (WBV) and noise in railway workers. In this historical cohort study, train drivers with combined exposure to WBV and impermissible noise as the case group ( = 85) and shunters with just exposure to impermissible noise as the control group ( = 30) were recruited. The hearing threshold at the conventional audiometric frequencies was measured in both the groups, and the standard threshold shift (STS) and hearing threshold shift at higher frequencies were calculated. Data were analyzed by SPSS version 20 using -test, Chi-square, and paired -test. There was no significant difference between the groups for age of participants as well as work duration and body mass index. Increased hearing threshold was most frequently observed at 3000, 4000, and 6000 Hz. STS and hearing threshold shift at high frequencies were observed at 6.0% and 3.3%, and 8.2% and 26.7% in train drivers and shunters in the left ear, respectively, but these were not statistically significant. Despite the unauthorized exposure to noise and WBV of train drivers, the STS and hearing threshold shift at higher frequencies were not more prevalent compared with the shunters who were exposed only to impermissible noise levels; hence, no association was found between noise and vibration in this study.
ISSN:	0973-2284 1998-3670
DOI:	10.4103/ijoem.IJOEM_252_18