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Long-Evans rats were exposed to 2450 MHz CW microwaves at an SAR of 0.14 W/kg (whole body, range of 0.11-0.18 W/kg) for 7 hr/day, 7 days/wk, for 90 days in an anechoic chamber. No effect of microwave exposure was observed for footshock reactivity or in open field tests. Some statistically significant but variable results were observed in a two-way active avoidance shuttlebox task and in a schedule-controlled lever-press response for food pellets. No effect of microwaves on urine 17-ketosteroid, red blood cell, plasma cholinesterase, or total plasma sulfhydryl group levels was observed. In a similar study, rats were exposed as above, but at SARs of 0.70 W/kg (whole body average). In this study, differences between exposed and sham-control rats were observed for open-field tests in addition to the shuttlebox avoidance and lever-pressing for food pellet tests. In an earlier study, Long-Evans rats were exposed to 915 MHz (CW) MW for 8 hr/day, 5 days/wk, for 16 weeks at an SAR of 2.46 W/kg. Although a difference in circulating blood sulfhydryls was noted, no effects were observed on activity, tissue histology, EEG, or a number of other hematopoietic factors (RBC, WBC, neutrophil, lymphocyte counts, heoglobin & hematocrit, etc). In a similar study, Long Evans rats were exposed to 400, 500, 600, or 700 MHz (CW or PW-1000 pulses per second, 3- or 30-usec pulse duration) MW at power densities up to 20 mW/cm2 and analyzed for lever pressing behavior. With exposure at 600 MHz (~resonant for the rat), work stoppage occured at above ~ 10 mW/cm2. |