この研究は、ウィスター雌ラットに14日齢から19月齢まで、1日2時間、週5日、GSM変調900MHz無線周波電磁界(RF-EMF)ばく露を頭部に与え、実験期間中に4つの行動学習テストを、若齢期、成獣期、初老期にそれぞれ3回実施した。頭部への限局的ばく露を確実にするため、成長にしたがって大きさを変えた固定器を用いた。頭部の平均SARは0(擬似)、0.7、 2.5、10 W/kgとした。行動学習テストは、ロータロッドテスト、モーリス水迷路テスト、8方向放射状迷路テスト、オープンフィールドテストである。その結果、どのテストにおいても各実験群に大きな差異はなかった;唯一見られたのは、初老期ラットのケージ対照群における2つのテストでの活動性の低下であったが、これはばく露のための毎日のハンドリングがなかったためと推測される;ばく露および擬似ばく露群の体重増加はケージ対照群と有意差がなかったため、拘束ストレスの影響は無視できると考える、と報告している。
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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.
ばく露 | パラメータ |
---|---|
ばく露1:
900 MHz
ばく露時間:
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)
|
|
ばく露2:
900 MHz
ばく露時間:
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)
|
|
ばく露3:
900 MHz
ばく露時間:
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)
|
|
周波数 | 900 MHz |
---|---|
タイプ |
|
ばく露時間 | 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) |
Modulation type | cf. additional information |
---|---|
Additional information |
GSM typical generic signal |
ばく露の発生源/構造 | |
---|---|
チャンバの詳細 | rats were fixed in restraining tubes of diffent sizes according to their increasing body weight |
ばく露装置の詳細 | 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. |
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
SAR | 0.7 W/kg | mean | 計算値 | brain | - |
周波数 | 900 MHz |
---|---|
タイプ |
|
ばく露時間 | 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) |
Modulation type | cf. additional information |
---|---|
Additional information |
GSM typical generic signal |
ばく露の発生源/構造 |
|
---|
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
SAR | 2.5 W/kg | mean | 計算値 | brain | - |
周波数 | 900 MHz |
---|---|
タイプ |
|
ばく露時間 | 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) |
Modulation type | cf. additional information |
---|---|
Additional information |
GSM typical generic signal |
ばく露の発生源/構造 |
|
---|
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
SAR | 10 W/kg | mean | 計算値 | brain | - |
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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