Study type: Medical/biological study (observational study)

Long-term (up to 20 years) effects of 50-Hz magnetic field exposure on immune system and hematological parameters in healthy men med./bio.

Published in: Clin Biochem 2013; 46 (1-2): 59-63

Aim of study (acc. to author)

To study the effects of an exposure to electromagnetic fields in workers chronically exposed to electromagnetic fields both at work and at home (between 1 and 20 years duration) on immunological-hematological parameters (q.v. Touitou et al. 2012).

Background/further details

The exposed volunteers (n=15) worked in substations and their main tasks included installing couplings between extra high voltage lines and voltage transformers. Moreover, the exposed subjects lived near the substations.
None of the controls had a professional position that could have resulted in occupational exposure to magnetic fields. They were subjected only to the normal electromagnetic fields of our daily environment.
All subjects were synchronized with daytime activity from 7:00 h to 23:00 h and nocturnal rest.
Blood samples were taken hourly from 20.00 h -8:00 h.



Exposure Parameters
Exposure 1: 50 Hz
Exposure duration: continuous for up to 20 years (10 workers: 7-20 years; 5 workers: 1-4 years)

Exposure 1

Main characteristics
Frequency 50 Hz
Exposure duration continuous for up to 20 years (10 workers: 7-20 years; 5 workers: 1-4 years)
Exposure setup
Exposure source
Additional info extra high voltage substations (occupational) and power lines (residential exposure) of a 225 kV and 400 kV electricity transmission network
Measurand Value Type Method Mass Remarks
magnetic flux density 0.72 µT mean calculated - of 15 workers
magnetic flux density 0.64 µT mean calculated - daytime (occupational exposure)
magnetic flux density 0.82 µT mean calculated - nighttime (residential)
magnetic flux density 2.6 µT maximum measured - geometric mean (individual exposure)

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

The data showed that a long-term chronic exposure to 50 Hz magnetic fields did not affect the hematological and immune system functions or their profiles in healthy men, at least for the variables studied. Thus, the data suggest that magnetic fields have no cumulative effects on these functions.

Study character:

Study funded by

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