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 ORIGINAL ARTICLE
Year : 2019  |  Volume : 23  |  Issue : 3  |  Page : 121-125

Effect of combined exposure to noise and vibration on hearing


Department of Occupational Medicine, Industrial Diseases Research Center, Center of Excellence for Occupational Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran

Correspondence Address:
Dr. Ahmad Shojaoddiny-Ardekani
Yazd Shahid Sadoughi University of Medical Sciences, Shahid Rahnemoon Hospital, Industrial Diseases Research Center, Postal Code 8913893111
Iran
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijoem.IJOEM_252_18

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Aim: This study was conducted to examine the effect(s) of combined exposure to whole-body vibration (WBV) and noise in railway workers. Methods: In this historical cohort study, train drivers with combined exposure to WBV and impermissible noise as the case group (n = 85) and shunters with just exposure to impermissible noise as the control group (n = 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 t-test, Chi-square, and paired t-test. Results: 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. Conclusion: 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.






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