The aims of this study were to examine the possible effects of 50 Hz sinusoidal magnetic fields on increased resorption or fetal loss in mice, and to try to replicate former results by Frölen (publication 2782) using 20 kHz sawtooth magnetic fields.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
20 kHz
Modulation type:
pulsed
Exposure duration:
continuous for 8 days, 24 hrs/day
|
|
|
Exposure 2:
50 Hz
Exposure duration:
continuous for 8 days, 24 hrs/day
|
|
|
Exposure 3:
50 Hz
Exposure duration:
continuous for 8 days, 24 hrs/day
|
|
Fairly well-described setup intended to replicate that of earlier studies. In experiment 6, only 13,5 µT were used on about half of the animals.
| Frequency | 20 kHz |
|---|---|
| Type | |
| Waveform |
|
| Exposure duration | continuous for 8 days, 24 hrs/day |
| Modulation type | pulsed |
|---|---|
| Rise time | 45 s |
| Fall time | 5 s |
| Exposure source |
|
|---|---|
| Setup | 4 Cages, 6 animals per cage were placed on the wooden rack. Control animals were placed at least 3.5 m away from the active exposure systems but were placed in the same set-up except that the magnetic field was less than 0.1 µT. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 15 µT | peak value | measured | - | - |
| Frequency | 50 Hz |
|---|---|
| Type | |
| Waveform | |
| Exposure duration | continuous for 8 days, 24 hrs/day |
| Exposure source |
|
|---|
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 13 µT | effective value | measured | - | corresponding magnetic field strength was 10 A/m. |
| Frequency | 50 Hz |
|---|---|
| Type | |
| Waveform | |
| Exposure duration | continuous for 8 days, 24 hrs/day |
| Exposure source |
|
|---|
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 130 µT | effective value | measured | - | corresponding magnetic field strength was 100 A/m. |
The resorption rate in CBA/Ca mice were not affected by exposure to different magnetic fields (i.e. 50 Hz/13 µT, 50 Hz/130 µT, or 20 kHz). The resorption rate in CBA/s mice exposed to 20 kHz magnetic fields was increased compared with the study of Frölen. Therefore, the animal strain is shown to be a crucial variable in bioelectromagnetic research.
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