研究のタイプ: 疫学研究 (observational study)

[超低周波電磁界にばく露した労働者での酸化ストレスに関する横断的研究] epidem.

A cross-sectional study on oxidative stress in workers exposed to extremely low frequency electromagnetic fields.

掲載誌: Int J Radiat Biol 2015; 91 (5): 420-425

この研究は、超低周波電磁界(ELF-EMF)にばく露した労働者(変圧器および配電線の点検に従事)をばく露群(n=310)、物流スタッフを対照群(n=300)として、酸化ストレスに関わる種々の血液パラメータを測定した横断研究である。その結果、血中の種々の酵素活性またはマロンジアルデヒドのレベルに有意な差はなかった;リンパ球小核発生頻度に有意差はなかった、と報告している。

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研究の目的(著者による)

A cross-sectional study was conducted in China to investigate whether exposure to extremely low frequency magnetic fields could induce oxidative stress in workers regularly performing inspection tours close to voltage transformers and distribution power lines.

影響評価項目/リスク推定のタイプ

リスク推定のタイプ:

ばく露

ばく露評価

ばく露集団

グループ 説明
参照集団 1 administrative staff: no exposure
集団 2 duration of magnetic field exposure: < 5 years
集団 3 duration of magnetic field exposure: ≥ 5 years
参照集団 4 8 h time-weighted average magnetic field strength: < 1.56 µT
集団 5 8 h time-weighted average magnetic field strength: 1.56 - 7.3 µT
集団 6 8 h time-weighted average magnetic field strength: > 7.3 µT

調査対象集団

調査規模

タイプ
合計 700
評価可能 560
統計学的分析方法:

結論(著者による)

In the 500 kV and 220 kV areas, the magnetic flux density at the spots ranged from 0.62-30.19 µT (median 18.7 µT) and from 0.51-60.11 µT (median 17.7 µT), respectively. In comparison, the magnetic flux density ranged from 0.07 to 0.72 µT with a median of 0.21 µT in the environment of the administrative staff. The 8 h time-weighted average magnetic flux density of the workers was 7.3 µT (1.56-26.3 µT).
No significant changes of the investigated oxidative stress parameters were found between workers that regularly perform inspection tours close to voltage transformers and distribution power lines and administrative staff.
The authors conclude that continual exposure to extremely low frequency electromagnetic fields might not induce oxidative stress in workers from a power supply company.

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