To study whether exposure to a subchronic electromagnetic field exposure (for two months) to a GSM signal induces persistent astroglial activation in five different rat brain areas (prefrontal cortex, caudate-putamen, lateral globus pallidus of striatum, dentate gyrus of hippocampus, and cerebellum cortex).
48 rats were divided into eight experimental groups. 24 rats were sacrificed three and 24 rats were sacrificed ten days after the end of exposure. Within each group of 24 rats the following groups were distinguished (each group = 6 rats): cage control, sham exposure, two exposure groups.
Exposure | Parameters |
---|---|
Exposure 1:
900 MHz
Modulation type:
pulsed
Exposure duration:
continuous for 45 min/day on 5 days/week during 8 weeks
|
|
Exposure 2:
900 MHz
Modulation type:
pulsed
Exposure duration:
continuous for 15 min/day on 5 days/week for 8 weeks
|
|
Frequency | 900 MHz |
---|---|
Type | |
Exposure duration | continuous for 45 min/day on 5 days/week during 8 weeks |
Modulation type | pulsed |
---|---|
Duty cycle | 12.5 % |
Repetition frequency | 217 Hz |
Exposure source |
|
---|---|
Setup | animals kept in plexiglas rockets with a truncated cone containing the loop antenna |
Sham exposure | A sham exposure was conducted. |
Measurand | Value | Type | Method | Mass | Remarks |
---|---|---|---|---|---|
SAR | 1.5 W/kg | average over mass | calculated | brain | - |
Frequency | 900 MHz |
---|---|
Type | |
Exposure duration | continuous for 15 min/day on 5 days/week for 8 weeks |
Modulation type | pulsed |
---|---|
Duty cycle | 12.5 % |
Repetition frequency | 217 Hz |
Exposure source |
|
---|---|
Sham exposure | A sham exposure was conducted. |
Measurand | Value | Type | Method | Mass | Remarks |
---|---|---|---|---|---|
SAR | 6 W/kg | average over mass | calculated | brain | - |
The data showed that subchronic exposure to GSM microwaves for 45 min/day at a SAR value of 1.5 W/kg or for 15 min/day at a SAR value of 6 W/kg induces an increase in GFAP expression in different brain areas three and ten days after treatment .
The authors conclude that subchronic exposures to a 900 MHz electromagnetic field signal for two months could adversely affect the rat brain (sign of a potential gliosis).
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