70 subjects participated including 50 exposed and 20 controls. The exposed group was divided into two subgroups: The "direct exposure group" (n=28) included electrical employees in transformers and power lines and the "indirect exposure group" (n=22) included office workers in place adjacent to electric supply substations. Additionally, the subjects were divided into two groups according to their age (≤ 40 years (n=37) and >40 (n=33)).
|Exposure 1: 50–60 Hz||
|electric field strength||130 V/m||minimum||measured||-||at the surroundings of power generation and transmission systems|
|electric field strength||8,310 V/m||maximum||measured||-||at the surroundings of power generation and transmission systems|
|electric field strength||300 V/m||minimum||measured||-||inside of power generation and transmission systems|
|electric field strength||15,000 V/m||maximum||measured||-||inside of power generation and transmission systems|
|magnetic field strength||0.5 A/m||minimum||measured||-||around the transformer buildings|
|magnetic field strength||1.7 A/m||maximum||measured||-||around the transformer buildings|
|magnetic field strength||0.25 A/m||minimum||measured||-||inside the transformer buildings|
|magnetic field strength||17 A/m||maximum||measured||-||inside the transformer buildings|
A higher degree of chromosome aberrations and micronuclei formation was found in exposed subjects compared to controls and the frequency of chromosome aberrations was significantly enhanced with long years of exposure. Moreover, an increase in chromosome aberration and micronuclei formation with age was observed in both exposed subjects and controls, but it was significantly greater in the exposed one.
The data indicate a significant induction of cytogenetic damage in peripheral lymphocytes of workers occupationally exposed to electric and magnetic fields in electric transformer and distribution stations.