Abstract
Virtually continual exposure to 970-MHz microwaves in circularly-polarized waveguides was used to elicit fetal responses in Sprague-Dawley rats during gestation. A total of 250 rats were exposed to microwave radiation at whole-body averaged specific absorption rates (SAR) of 0.07, 2.4, or 4.8 W/kg or concurrently sham-irradiated for 22 h/day from the 1st through the 19th day of gestation. Prior to irradiation or sham irradiation, the rats were acclimated to cages in the waveguide system for 10 days and then bred. The rats were killed on the 20th day of gestation, and their fetuses counted and weighed, the fetal sternebrae ossifications counted, and the number of corpora lutea of the pregnancy determined. There were no alterations in pregnancy rates, fetal numbers (live, dead, resorbed, or total conceptuses), fetal weights, fetal skeletal maturation, or preimplantation losses after exposure at SARs of 0.07 or 2.4 W/kg. At SAR of 4.8 W/kg, only fetal body weight was significantly altered (- 12%, p = 0.012)....
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