Abstract
The effects of 8 hr continuous exposure of rats to 2450-MHz (cw) microwave radiation were studied at incident power densities of 0, 2 and 10 mW/cm/sup 2/. Thyroid axis function, as measured by serum thyroxine (T/sub 4/) and triiodothyronine (T/sub 3/) as well as T/sub 3/ uptake, free thyroxine index, and adjusted-T/sub 4/ values was not altered by the experimental conditions. Adrenal axis activity was also unaffected in rats exposed to 2 mW/cm/sup 2/ microwave radiation for 8 hr. In the 10 mW/cm/sup 2/ group, the serum corticosterone levels were less than in the 0 or 2 mW/cm/sup 2/ groups (7.8 versus 9.9 ..mu..g/dl). The experimental protocol increased serum corticosterone levels (7.0 versus 9.9 ..mu..g/dl for the nonhandled and sham-exposed groups, respectively); however, the corticosterone concentration in the 10 mW/cm/sup 2/ group was similar to that in the untreated (nonhandled) controls (7.8 versus 7.0 ..mu..g/dl). This modified adrenal axis function gives further support to the concept that microwave radiation affects endocrine function.
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