The effects of exposure of rats to electromagnetic fields of 900 MHz or 1800 MHz on the permeability of the blood brain barrier should be investigated.
A total of 27 male and 26 female rats were divided into the following groups: 1) exposure of male rats to a 900 MHz EMF (n=9), 2) exposure of female rats to a 900 MHz EMF (n=8), 3) exposure of male rats to a 1800 MHz EMF (n=9), 4) exposure of female rats to a 1800 MHz EMF (n=9), sham exposure of 5) male and 6) female rats (n=9 each, control groups).
| Exposure | Parameters |
|---|---|
|
Exposure 1:
900 MHz
Modulation type:
pulsed
Exposure duration:
continuous for 20 minutes
|
|
|
Exposure 2:
1,800 MHz
Modulation type:
pulsed
Exposure duration:
continuous for 20 minutes
|
|
| Frequency | 900 MHz |
|---|---|
| Type | |
| Waveform | |
| Charakteristic | |
| Exposure duration | continuous for 20 minutes |
| Modulation type | pulsed |
|---|---|
| Repetition frequency | 217 Hz |
| Additional info |
duty cycle of 577 µs |
| Exposure source | |
|---|---|
| Distance between exposed object and exposure source | 10 cm |
| Chamber | an ideal laboratory with no noise |
| Setup | body temperatures were measured by rectal temperature measurement before and after the exposure: it was not affected by exposure |
| Sham exposure | A sham exposure was conducted. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| electric field strength | 4.96 V/m | - | measured | - | ± 0.04 V/m |
| SAR | 0.02 W/kg | mean | calculated | - | worst case value |
| Frequency | 1,800 MHz |
|---|---|
| Type | |
| Waveform | |
| Charakteristic | |
| Exposure duration | continuous for 20 minutes |
| Modulation type | pulsed |
|---|---|
| Repetition frequency | 217 Hz |
| Additional info |
duty cycle of 577 µs |
| Exposure source |
|
|---|---|
| Distance between exposed object and exposure source | 10 cm |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| electric field strength | 4.7 V/m | - | measured | - | ± 0.02 V/m |
| SAR | 0.02 W/kg | mean | calculated | - | worst case value |
In male rats, exposure to the electromagnetic fields of 900 MHz (group 1) and 1800 MHz (group 3) led to a significantly increased permeability of the blood brain barrier compared to the control group (group 5).
In female rats, only exposure to the 900 MHz EMF (group 2) resulted in a significantly increased permeability of the blood brain barrier compared to the control group (group 6).
The authors conclude that exposure of rats to electromagnetic fields of 900 MHz or 1800 MHz might increase the permeability of the blood brain barrier with sex-specific differences.
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