To study reactivity to electric footshock, blood levels of cholinesterase and sulfhydryl groups, urinary output of 17-ketosteroids, and deficits of performance in the shuttle box during or after chronic microwave exposure of a pigmented strain of rats.
|Exposure duration||630 h altogather (7 h/d, 7 d/wk)|
Daily measures of body mass and food and water intake indicated no statistically significant effects of microwave irradiation. Monthly assessment of reactivity to electric footshock, levels of cholinesterase and sulfhydryl groups in blood, and 17-ketosteroids in urine revealed no reliable differences between sham-exposed and microwave-exposed animals.
After the 90 days of irradiation, rats from each group were assessed for open field behavior, shuttlebox performance, and schedule-controlled lever pressing for food pellets. Statistically significant differences between microwave-exposed and sham-exposed animals were found in shuttlebox performances and lever pressing.
Post mortem measures of mass of several organs and microscopic examination of adrenal tissue revealed no differences between the two groups of rats. In summary, the results of chronic intermittent irradiation of rats to 0.5 mW/cm² appear to be minor or of little biological significance.