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).
Exposure duration: 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
|Exposure duration||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|
|Modulation type||AM, pulsed|
carrier frequency of 916.5 MHz
|electric field strength||3.4 V/m||minimum||measured||-||in the empty stalls|
|electric field strength||29 V/m||maximum||measured||-||in the empty stalls|
|electric field strength||12 V/m||spatial average||measured||-||in the empty stalls|
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.