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.
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)
|
|
| Frequency | 1.6 mHz |
|---|---|
| Type | |
| Waveform |
|
| Exposure duration | continous for 8 h/week (six times in random order with sham exposure) |
| 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 | - | - |
There was no significant difference between circadian responses to real and sham exposure in any variable at any circadian stage.
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