To investigate the effects of 50 Hz magnetic fields on the human body.
In a first experiment, several parameters (see methods) were measured in the probands for 1.5 to 2 minutes by a polygraph (popularly referred to as a lie detector). Afterwards, a helmet containing the coils was put on and the volunteer was exposed to the magnetic field for 4.5 to 5 minutes while the measurement parameters were recorded.
In a second experiment, the helmet was directly put on. Parameters were recorded for 1.5 minutes without the magnetic field. Then the magnetic field was switched on for 2 minutes (75-80 A/m). Afterwards, the magnetic field was switched off and the recording proceeded for 1 minute. This procedure was followed by an additional exposure for 1.5 minutes to a stronger magnetic field strength (150-160 A/m) while parameters were recorded.
60 probands were examined (male and female). However, it is not clear if all probands took part in both experiments and if both experiments were conducted on the same day.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
50 Hz
Exposure duration:
4.5 to 5 minutes
first experiment
|
|
|
Exposure 2:
50 Hz
Exposure duration:
2 minutes
second experiment
|
|
|
Exposure 3:
50 Hz
Exposure duration:
1.5 minutes
second experiment
|
|
| Frequency | 50 Hz |
|---|---|
| Type | |
| Exposure duration | 4.5 to 5 minutes |
| Additional info | first experiment |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic field strength | 75 A/m | minimum | measured | - | - |
| magnetic field strength | 80 A/m | maximum | measured | - | - |
| Frequency | 50 Hz |
|---|---|
| Type | |
| Exposure duration | 2 minutes |
| Additional info | second experiment |
| Exposure source |
|
|---|---|
| Sham exposure | A sham exposure was conducted. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic field strength | 75 A/m | minimum | measured | - | - |
| magnetic field strength | 80 A/m | maximum | measured | - | - |
| Frequency | 50 Hz |
|---|---|
| Type | |
| Exposure duration | 1.5 minutes |
| Additional info | second experiment |
| Exposure source |
|
|---|---|
| Sham exposure | A sham exposure was conducted. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic field strength | 150 A/m | minimum | measured | - | - |
| magnetic field strength | 160 A/m | maximum | measured | - | - |
The heart rate and the electrodermal activity were significantly different between the exposed and the unexposed condition (probably in the first experiment).
Changes between all conditions (before exposure, during exposure, after exposure, high exposure) were statistically significant in all parameters (probably in the second experiment).
Remark EMF-Portal: it is not directly stated which results belong to which experiment and if measured values were increased or decreased.
The authors conclude that 50 Hz magnetic fields could have an inpact on the human body.
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