Study type: Medical/biological study (observational study)

Evaluation of chromosomal alteration in electrical workers occupationally exposed to low frequency of electro magnetic field (EMFs) in Coimbatore population, India. med./bio.

Published in: Asian Pac J Cancer Prev 2012; 13 (6): 2961-2966

Aim of study (acc. to author)

To study the possible cytogenetic effects of electricity workers in Coimbatore District and surrounding region (Tamil Nadu, South India) exposed to electric and magnetic fields.

Background/further details

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)).

Endpoint

Exposure

Exposure Parameters
Exposure 1: 50–60 Hz
Exposure duration: from 20 ± 4.7 (direct exposure group) up to 23 ± 6 years (indirect exposure group)

Exposure 1

Main characteristics
Frequency 50–60 Hz
Type
Exposure duration from 20 ± 4.7 (direct exposure group) up to 23 ± 6 years (indirect exposure group)
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
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

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • during exposure
  • after exposure

Main outcome of study (acc. to author)

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.

Study character:

Study funded by

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