To examine whether exposure of humans to 50 Hz-magnetic fields influences the nerve conduction mechanism in the arm.
6 healthy volunteers were examined. Measurements were performed three times for every proband: 1.) before exposure, 2.) during exposure and 3.) after exposure. The median nerve from the right arm was stimulated on the elbow and on the wrist with pulses (0.2 ms, 2 Hz). The motor responses were recorded from the Abductor pollicis brevis muscle (abductor of the thumb), using surface electrodes.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
50 Hz
Exposure duration:
continuous for 5 min
|
|
| Frequency | 50 Hz |
|---|---|
| Type | |
| Waveform | |
| Exposure duration | continuous for 5 min |
| Exposure source | |
|---|---|
| Setup | pair of Helmholtz coils with a diameter of 10 cm and 220 turns of 0.8 mm gauge copper wire placed parallel to the table, mounted on a plastic frame, 15 cm apart, connected in series; arm of the test person placed in the axial position in the coils |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 1 mT | - | measured and calculated | - | - |
No significant differences were seen between the measurements during the exposure and the measurements before and after the exposure. However, a significant decrease in the stimulus conduction was observed in the measurements after the exposure when compared to the measurements before the exposure.
The authors conclude that these results could indicate a potential deleterious effect of 50 Hz-magnetic field exposure on human nerves.
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