To investigate possible long-term effects of electromagnetic fields (GSM 900 MHz) on the developing rat brain.
120 female rats were randomly divided into five groups (n=24 per group): 1.) cage control, 2.) sham exposure, 3.) SAR of 0.7 W/kg, 4.) SAR of 2.5 W/kg, and 5.) SAR of 10 W/kg. Exposure started at the age of 14 days until the age of 19 months.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
900 MHz
Exposure duration:
5 to 120 min/day, 5 days/week from the age of 14 days to 19 months (5 min at the beginning and stepwise increase to 120 min within the next 7 days)
|
|
|
Exposure 2:
900 MHz
Exposure duration:
5 to 120 min/day, 5 days/week from the age of 14 days to 19 months (5 min at the beginning and stepwise increase to 120 min within the next 7 days)
|
|
|
Exposure 3:
900 MHz
Exposure duration:
5 to 120 min/day, 5 days/week from the age of 14 days to 19 months (5 min at the beginning and stepwise increase to 120 min within the next 7 days)
|
| Frequency | 900 MHz |
|---|---|
| Type | |
| Exposure duration | 5 to 120 min/day, 5 days/week from the age of 14 days to 19 months (5 min at the beginning and stepwise increase to 120 min within the next 7 days) |
| Exposure source | |
|---|---|
| Chamber | rats were fixed in restraining tubes of diffent sizes according to their increasing body weight |
| Setup | eight identical exposure devices, with six animals each, were used with two devices assigned to the same SAR level; each exposure device consisted of six individual upright standing rectangular waveguides arranged in the shape of a hexagon with exchangeable adapters for different restrainer sizes; ramps with a 5° downward slope to drain off urine were installed onto a table; for ventilation, a central opening formed by the six waveguides was created; a signal generator for the 900 MHz carrier, a modulator for a GSM-typical generic signal, and a power amplifier were used as single source and powered the exposure devices by a distribution network with decoupled outputs; field was transformed by means of an internal cone antenna and a shortcut at the waveguide's upper end |
| Sham exposure | A sham exposure was conducted. |
| Frequency | 900 MHz |
|---|---|
| Type | |
| Exposure duration | 5 to 120 min/day, 5 days/week from the age of 14 days to 19 months (5 min at the beginning and stepwise increase to 120 min within the next 7 days) |
| Exposure source |
|
|---|
| Frequency | 900 MHz |
|---|---|
| Type | |
| Exposure duration | 5 to 120 min/day, 5 days/week from the age of 14 days to 19 months (5 min at the beginning and stepwise increase to 120 min within the next 7 days) |
| Exposure source |
|
|---|
No consistent significant differences were observed between the exposed rats and the sham exposed rats.
The authors conclude that no indication was found that long-term exposure to electromagnetic fields (GSM 900 MHz) has a deleterious effect on the developing rat brain.
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