Three identical independent experiments were performed with a total of 36 rats. For each experiment, 12 pregnantrats were divided into three groups of four rats each: Group 1 received sham exposure, and groups 2 and 3 were exposed to electromagnetic fields at low and high levels, respectively. Four days after delivery, eight F1rats per dam (four males and four females) were also selected for continuous exposure until age of 21 days. Exposure of the 10-week-old pregnantrats was started at gestational day 7 and continued for 20 h per day until weaning of F1rats.
two 180 mm long dipoleantennas intersecting at a right angle
Setup
90 cm x 90 cm x 60 cm exposure boxes, covered on the inside with 6 cm thick planar RF absorbers except for the ceiling, which was made of metal mesh; animals placed in individual 690.8 mm² acrylic cages inside the exposure boxes
Shirai T et al.
(2007):
Lack of promoting effects of chronic exposure to 1.95-GHz W-CDMA signals for IMT-2000 cellular system on development of N-ethylnitrosourea-induced central nervous system tumors in F344 rats
Overall, the data did not reveal any adverse effects of exposure to a 2.14 GHzW-CDMAsignal for 20 h/day. The value of the present negative results, however, could be limited by the lack of a positive control. The findings did demonstrate some statisticallysignificant differences between the sham exposure group and the exposure groups. For example, the body weights of exposed males were increased. However, such changes were transient and were not considered to be due to the exposure. Among seven physiological development indicators, delay of pinna unfolding was found in the high exposure group at day 2 but not at day 3. Furthermore, while the number of corpora lutea in the pregnantF1 females was found to be decreased in the low exposure group, a decrease was not present in the high exposure group. Thus none of the experimental findings demonstrated any consistent adverse biological effects of whole body exposure to the electromagnetic field on gestation and lactation in either dams or F1rats or in the F2 offspring under these experimental conditions.
Ministry of Internal Affairs and Communications, Japan
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