Study type: Medical/biological study (experimental study)

Does exposure to an artificial ULF magnetic field affect blood pressure, heart rate variability and mood? med./bio.

Published in: Biomed Pharmacother 2004; 58: S20-S27

Aim of study (acc. to author)

To determine whether an artificial magnetic field with an amplitude and frequency equivalent to those of geomagnetic pulsations during geomagnetic storms could affect physiology and psychology of humans.

Background/further details

Three healthy volunteers were exposed for 8 hours to either a magnetic field (47-56 nT) or sham exposure at one of six circadian stages (i.e. from 3:00-11:00 h, 7:00-15:00 h, 11:00-19:00 h, 15:00-23:00 h, 19:00-3:00 h and 23:00-7:00 h) for 12 consecutive weekends. Real exposure randomly alternated with sham exposure. The test persons wore an ambulatory blood pressure monitor and an ECG recorder.



Exposure Parameters
Exposure 1: 1.6 mHz
Exposure duration: continous for 8 h/week (six times in random order with sham exposure)

Exposure 1

Main characteristics
Frequency 1.6 mHz
  • unspecified
Exposure duration continous for 8 h/week (six times in random order with sham exposure)
Exposure setup
Exposure source
Chamber magnetically shielded room (3 m width x 3 m depth x 3 m height); shielded against ELF and VLF
Setup subjects stayed in a wooden bed which was located between the coils (95 cm radius, 12 turns of enameled copper wire)
Sham exposure A sham exposure was conducted.
Measurand Value Type Method Mass Remarks
magnetic flux density 56 nT maximum measured - -
magnetic flux density 47 nT minimum measured - -

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

There was no significant difference between circadian responses to real and sham exposure in any variable at any circadian stage.

Study character:

Study funded by

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