The effects of an acute exposure of rats and isolated sciatic nerves to a 50 Hz magnetic field on the nerve function should be investigated.
In total, 40 rats were used. 20 rats were used in in vivo tests and 20 rats were used to isolate sciatic nerves for in vitro tests. Accordingly, rats were divided into 4 groups (n=10 each): 1) exposed rats, 2) sham exposed rats, 3) exposed sciatic nerves, 4) sham exposed sciatic nerves.
In the in vivo tests, rats were anesthetized and exposure to the magnetic field was conducted from the 20th to the 22nd minute thereafter. They were examined 2 minutes prior to the exposure, 2 minutes during the exposure and 2 minutes after the exposure. For the in vitro tests, isolated nerves were exposed to the magnetic field for 30 seconds and investigated thereafter.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
50 Hz
Exposure duration:
continuous for 2 minutes
|
|
|
Exposure 2:
50 Hz
Exposure duration:
continuous for 30 seconds
|
|
maximum environmental magnetic flux density was 1 µT and maximum environmental electric field intensity was 1 V/m; maximum voltage was 10 V
| Frequency | 50 Hz |
|---|---|
| Type | |
| Waveform | |
| Exposure duration | continuous for 2 minutes |
| Additional info | rats |
| Exposure source | |
|---|---|
| Chamber | rats were fixed on a plastic plate |
| Setup | two 500-turn coils with inner diameter of 18.6 cm and outer diameter of 22.1 cm were placed parallel to each other at a distance of 2.35 cm (?) (remark EMF-Portal: probably more); the plastic plate was placed between the coils |
| Sham exposure | A sham exposure was conducted. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 0.3 mT | - | measured | - | ± 0.002 mT |
| Frequency | 50 Hz |
|---|---|
| Type | |
| Waveform | |
| Exposure duration | continuous for 30 seconds |
| Additional info | nerves |
| Exposure source | |
|---|---|
| Chamber | nerves were placed in cell chamber on plastic plate |
| Setup | two 500-turn coils with inner diameter of 18.6 cm and outer diameter of 22.1 cm were placed parallel to each other at a distance of 2.35 cm (?) (remark EMF-Portal: probably more); the plastic plate was placed between the coils |
| Sham exposure | A sham exposure was conducted. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 0.3 mT | - | measured | - | ± 0.002 mT |
No significant differences were found in any parameter between exposed rats (group 1) or nerves (group 3) and their corresponding sham exposure groups (groups 2 and 4).
The authors conclude that their results do not indicate any detrimental effect of an acute exposure of rats or isolated sciatic nerves to a 50 Hz magnetic field on the nerve function. Further research on this topic is necessary as results in literature are not consistent.
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