この研究は、バックグラウンド電磁界が低い郊外の動物病院の牛舎にGSM信号送信アンテナを設置して、10匹の雌ウシ（年齢多様、6匹は妊娠中）の血液パラメータへの非電離放射線（NIR）ばく露の影響を調べた。実験期間は2012年11月－2013年2月で、事前観察2週間、ばく露期間4週間、事後観察4週間であった。10匹が個体別に仕切られ並んだ位置の後方2mの平行線上に等間隔で3本のアンテナを並べた。各個体の位置での平均入射電力は12V/mであった。実験期間中、尾静脈から採血した（2週間に10回）。その結果、NIRばく露により一部の酵素活性が低下あるいは上昇した；ただし、そのような変化のパターンは個体により異なった；行動観察では、NIRに反応する個体、全く反応しない個体があった、と報告している。
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The effects of a whole body exposure of cattle to a 900 MHz electromagnetic GSM field on oxidative stress in the blood should be investigated.
10 cattle were examined. The test lasted for a total of 10 weeks, including a 4-week exposure period. During the first two weeks without exposure, 10 samples per animal, one per day, were taken (pre-exposure samples as control). Afterwards, exposure started (week 3 - 6) and in the weeks 5 and 6, a total of 10 samples per animal, one per day, was taken again (exposure samples). Following exposure, post-exposure took place (week 7 - 10) and finally, a total of 10 samples per animal, one per day, was taken in the weeks 9 and 10 (post-exposure samples).
| ばく露 | パラメータ |
|---|---|
|
ばく露1:
900 MHz
Modulation type:
AM, pulsed
ばく露時間:
intermittent exposure for min. 6 h 36 min, max. 19 h and 16 h 43 min on average per day with a standard deviation of 3 h 03 min for 30 days
|
| 周波数 | 900 MHz |
|---|---|
| タイプ |
|
| ばく露時間 | intermittent exposure for min. 6 h 36 min, max. 19 h and 16 h 43 min on average per day with a standard deviation of 3 h 03 min for 30 days |
| ばく露の発生源／構造 |
|
|---|---|
| チャンバの詳細 | cows were housed and exposed in tie stalls next to each other; they were kept outside on a square in front of the barn to move freely for 2 h/day |
| ばく露装置の詳細 | three 900 MHz antennas installed at 2 m height behind the cows with a 30° downward tilt |
The enzyme activity of glutathione peroxidase was significantly increased, whereas the superoxide dismutase activity was significantly decreased in exposure samples compared to pre-exposure samples. The catalase activity, however, did not show any significant changes between these samples but a significant decrease in post-exposure samples compared to exposure.
The authors conclude, that a whole body exposure of cattle to a 900 MHz electromagnetic GSM field could influence enzyme activity in the blood. However, present results allow no conclusion regarding oxidative stress and further, improved studies on this topic are necessary.
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