Incidence of low-level microwave irradiation on intestinal myoelectrical activity in the rat.

We studied the effect of low-level microwave irradiation (5 and 7.5 mW/cm2 at 2.45 GHz) on intestinal myoelectrical activity on seven unanesthetized rats by way of chronically implanted electrodes. Exposure to microwaves occurred for 1-4 hr in a cavity. The specific absorption rates (SAR) measured were respectively: 5.35, 6.05 and 7.04 mW/g under 5, 7.5 and 10 mW/cm2 of incident radiation. The results obtained showed there is no noticeable electromagnetic interference between microwave and metallic-insulated implanted electrodes. Microwaves produce an accelerating effect on slow waves and a specific inhibitory effect on action potentials, which appears to be directly dependent on the measured SAR values.