この研究は、睡眠の質と睡眠時間に対する電磁界ばく露の影響について、中国浙江省の電力プラント従業員を対象に横断調査した。構造化質問票（社会人口学的特性、生活スタイル、睡眠パラメータ、電磁界ばく露）に回答し、身体検査と採血に応じた854人を最終的に分析した。対象者を一日の職業的電磁界ばく露時間（≦1.5時間、1.5−4時間、4時間＜）により分類すると、一日のばく露時間が長くなるほど、睡眠の質が有意に低下したが、就業年数（≦23年、23年＜）による影響はなかった、などの観察結果を報告している。また、家庭での電力料金、携帯電話使用年数と睡眠の質との関連は見られなかったと報告している。
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A cross-sectional study was conducted in China to investigate the relationship between self-assessed sleep status and electromagnetic field exposures, especially power frequency magnetic fields, in workers of a power plant.
Sleep quality was assessed by asking the participants to evaluate the sleep quality and the sleep duration during the past month. Sleep duration was categorized in short (< 7 h), medium (7-8 h), and long (≥ 8 h).
| グループ | 説明 |
|---|---|
| 参照集団 1 | daily occupational exposure time: ≤ 1.5 hours/day |
| 集団 2 | daily occupational exposure time: < 1.5 - ≤ 4 hours/day |
| 集団 3 | daily occupational exposure time: > 4 hours/day |
| 参照集団 4 | occupational exposure duration: < 23 years |
| 集団 5 | occupational exposure duration: ≥ 23 years |
| 参照集団 6 | electric fee: < 150 yuan/month |
| 集団 7 | electric fee: ≥ 150 yuan/month |
| 参照集団 8 | mobile phone use: < 12 years |
| 集団 9 | mobile phone use: ≥ 12 years |
| タイプ | 値 |
|---|---|
| 合計 | 1,073 |
| 適格者 | 854 |
The measured electric field strength was 316.3 ± 1212.3 V/m and magnetic field strength was 6.17 ± 14.71 µT in the exposure group, which far outstripped the values in the non-exposure group (3.9 ± 0.3 V/m and 0.061 ± 0.017 µT, respectively).
Subjects with long daily exposure time had a significantly higher risk of poor sleep quality (group 2: OR 1.68, CI 1.18-2.39; group 3: OR 1.57, CI 1.10-2.24) in comparison to those with short daily exposure time (group 1). Additionally, among the subjects with long-term occupational exposure, the longer daily occupational exposure time apparently increased the risk of poor sleep quality (> 1.5 - ≤4 hours/day: OR 2.12 CI 1.23-3.66; > 4 hours/day: OR 1.83, CI 1.07-3.15). 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.
The authors conclude that the results showed an association between daily occupational power frequency magnetic field exposure and poor sleep quality. It implies that power frequency magnetic field exposure may damage human sleep quality rather than sleep duration.
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