Saf Health Work.  2019 Mar;10(1):109-113. 10.1016/j.shaw.2018.07.002.

The Effect of Occupational Noise Exposure on Serum Cortisol Concentration of Night-shift Industrial Workers: A Field Study

Affiliations
  • 1Department of Occupational Health, School of Public Health, Kerman University of Medical Sciences, Kerman, Iran.
  • 2Modeling in Health Research Center, Institute for Futures Studies in Health, Department of Biostatistics and Epidemiology, Kerman University of Medical Sciences, Kerman, Iran.
  • 3Department of Occupational Health, School of Public Health, Urmia University of Medical Sciences, Urmia, Iran. r.hemmatjo@yahoo.com
  • 4Department of Occupational Health, School of Public Health, Qazvin University of Medical Sciences, Qazvin, Iran.
  • 5Department of Occupational Health, School of Public Health, Bushehr University of Medical Sciences, Bushehr, Iran.
  • 6Department of Occupational Health, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

Abstract

BACKGROUND
In both developed and developing countries, noise is regarded as the most common occupational hazard in various industries. The present study aimed to examine the effect of sound pressure level (SPL) on serum cortisol concentration in three different times during the night shift.
METHODS
This case–control study was conducted among 75 workers of an industrial and mining firm in 2017. The participants were assigned to one of the three groups (one control and two case groups), with an equal number of workers (25 participants) in each group. Following the ISO 9612 standard, dosimetry was adopted to evaluate equivalent SPL using a TES-1345 dosimeter. The influence of SPL on serum cortisol concentration was measured during the night shift. The serum cortisol concentration was measured using a radioimmunoassay (RIA) test in the laboratory. Repeated measure analysis of variance and linear mixed models were used with α = 0.05.
RESULTS
The results indicated a downward trend in the serum cortisol concentration of the three groups during the night shift. Both SPL and exposure time significantly affected cortisol concentration (p < 0.0001, p < 0.0001). Conversely, age and body mass index had no significant influence on cortisol concentration (p = 0.360, p = 0.62).
CONCLUSION
Based on the obtained results, increasing SPL will lead to enhancement of serum cortisol concentration. Given that cortisol concentration varies while workers are exposed to different SPLs, this hormone can be used as a biomarker to study the effect of noise-induced stress.

Keyword

Cortisol; Noise; Shift work; Sound pressure level
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