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首页> 美国卫生研究院文献>Springer Open Choice >Effect of extremely low frequency electromagnetic field exposure on sleep quality in high voltage substations
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Effect of extremely low frequency electromagnetic field exposure on sleep quality in high voltage substations

机译：极低频电磁场暴露对高压变电站睡眠质量的影响

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This study aims to investigate the effect of extremely low frequency electromagnetic fields exposure on sleep quality in high voltage substations (132, 230 and 400 KV) in Kerman city and the suburbs. For this purpose, the electric field intensity and magnetic flux density were measured in different parts of substations, and then the occupational exposure was estimated by averaging electric field intensity and magnetic flux density in a shift work. The cases comprised 67 workers who had been exposed to electromagnetic fields in age range of 24–57 and the controls were 110 persons the age ranged 24–50 years. Sleep quality of both groups was evaluated by the Pittsburgh Sleep Quality Index questionnaire (PSQI). Finally, these data were subjected to statistical analysis. The results indicated that 90.5% of cases and 85.3% of controls had the poor quality sleep according to PSQI (P-value=0.615). Total sleep quality score mean for the case and control groups were 10.22 ± 3.4 and 9.74 ± 3.62 (P-value=0.415) ,respectively. Meantime to fall asleep for cases(35.68 ± 26.25 min) was significantly higher than for controls (28.89 ± 20.18 min) (P-value=0.002). Cases had average sleep duration of 5.49 ± 1.31 hours, which was lower ascompared with control subjects (5.90 ± 1.67hours). Although there was a higher percentage for the case group with poor sleep quality than the control group, but no statistically significant difference was observed.
机译：这项研究旨在调查极低频电磁场暴露对克尔曼市和郊区高压变电站（132、230和400 KV）的睡眠质量的影响。为此，测量变电站不同部分的电场强度和磁通密度，然后通过平均轮班工作中的电场强度和磁通密度来估算职业暴露。这些病例包括67名暴露于24-57岁电磁场的工人，对照组为110人，年龄在24-50岁之间。两组的睡眠质量均通过匹兹堡睡眠质量指数调查表（PSQI）进行评估。最后，对这些数据进行统计分析。结果表明，根据PSQI（P值= 0.615），90.5％的病例和85.3％的对照者的睡眠质量较差。病例组和对照组的总睡眠质量得分平均值分别为10.22±3.4和9.74±3.62（P值= 0.415）。患者入睡的平均时间（35.68±±26.25 min）显着高于对照组（28.89±±20.18 min）（P值= 0.002）。病例的平均睡眠时间为5.49±1.31小时，比对照组的5.99±1.67小时要低。尽管睡眠质量较差的病例组的百分比高于对照组，但未观察到统计学差异。

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