Effect of Occupational Noise-induced Sleep Disturbance on Worker's Health

Document Type : Original Article


1 Research Center for Environmental Determinants of Health, Kermanshah University of Medical Science, Kermanshah, Students’ Scientific Research Center, Tehran University of Medical Sciences,

2 Department of Occupational Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran,



Aims: In addition to the noise, sleep disturbance (SD) as an outcome of the exposure to the wind turbine noises (WTNs) can adversely affect
general health. This study aimed to investigate the effect of SD induced from WTNs on general health indicators. Materials and Methods: A total
number of fifty tree workers from Manjil wind farm voluntarily participated in this study. Based on the job similarity and vicinity to the sound
sources, workers were classified into three occupational groups including repairman, security, and official staff. Individual’s health and sleep
status were gathered using the 28‑item General Health Questionnaire and Epworth Sleepiness Scales, respectively. Noise was measured based
on ISO 9612. ANOVA, Chi‑square, and linear and multiple regression tests were used for data analysis in the SPSS 20 software environment.
Results: The mean values of 8‑h equivalent continuous A‑weighted sound pressure level (LAeq, 8 h) among whole workers was 71 ± 10 dB (A).
The averages of somatic symptom, anxiety insomnia, social dysfunction, depression, and general health among the participants were 5 ± 2.44,
7 ± 2.35, 11 ± 2.65, 2 ± 1.54, 22 ± 6.53, and 7.3 ± 3.1, respectively. According to the results, SD and noise exposure had an adverse health effect
on physical symptoms, depression, and overall general health of participants. Moreover, SD and work experience were effective factors on
anxiety‑insomnia. SD had greatest effect on general health when all variables are controlled, so that general health will increase by 2.42 units
for each unit increase of SD. Conclusion: We found that in addition to the sound effect, noise‑induced SD also affects worker’s health and
strengthen sound effects on human well‑being.