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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.
|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|
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.