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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).
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
|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|
|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.