Occupational Electromagnetic Field Exposures Associated with Sleep Quality: A Cross-Sectional Study

Bron: www.ncbi.nlm.nih.gov/pmc/articles/PMC4207748/
PLoS One. 2014; 9(10): e110825.
Published online 2014 Oct 23. doi: 10.1371/journal.pone.0110825

Hui Liu 1,3, Guangdi Chen 2, Yifeng Pan 1,3, Zexin Chen 1,3, Wen Jin 1,3, Chuan Sun 2, Chunjing Chen 2, Xuanjun Dong 4, Kun Chen 1, Zhengping Xu 2, Shanchun Zhang 1,3 and Yunxian Yu 1,3
Gianluigi Forloni, Editor

1. Department of Epidemiology & Health Statistics, School of Public Health, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China,
2. Bioelectromagnetics Laboratory, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China,
3. Chronic Disease Research Institute, School of Public Health, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China,
4. Yiwu Center for Disease Control and Prevention, Yiwu, Zhejiang, China,
“Mario Negri” Institute for Pharmacological Research, Italy

Abstract
Background
Exposure to electromagnetic field (EMF) emitted by mobile phone and other machineries concerns half the world’s population and raises the problem of their impact on human health. The present study aims to explore the effects of electromagnetic field exposures on sleep quality and sleep duration among workers from electric power plant.

Methods
A cross-sectional study was conducted in an electric power plant of Zhejiang Province, China. A total of 854 participants were included in the final analysis. The detailed information of participants was obtained by trained investigators using a structured questionnaire, which including socio-demographic characteristics, lifestyle variables, sleep variables and electromagnetic exposures. Physical examination and venous blood collection were also carried out for every study subject.

Results
After grouping daily occupational electromagnetic exposure into three categories, subjects with long daily exposure time had a significantly higher risk of poor sleep quality in comparison to those with short daily exposure time. The adjusted odds ratios were 1.68 (95%CI: 1.18, 2.39) and 1.57 (95%CI: 1.10, 2.24) across tertiles. Additionally, among the subjects with long-term occupational exposure, the longer daily occupational exposure time apparently increased the risk of poor sleep quality (OR (95%CI): 2.12 (1.23∼3.66) in the second tertile; 1.83 (1.07∼3.15) in the third tertile). There was no significant association of long-term occupational exposure duration, monthly electric fee or years of mobile-phone use with sleep quality or sleep duration.

Conclusions
The findings showed that daily occupational EMF exposure was positively associated with poor sleep quality. It implies EMF exposure may damage human sleep quality rather than sleep duration.



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