Huber R, Graf T, Cote KA, Wittman L, et al.

The authors conducted experiments on 16 healthy young men, who had been sleep-deprived during the night preceding the experiment. The subjects were exposed to EMF for 30 minutes prior to a 3-hour sleep episode that was scheduled in the late morning. The EMF exposure was 900 MHz, with a spatial peak SAR of 1 W/kg. The experiment consisted of 3 sessions separated by 1-week intervals. The exposure was to the right hemisphere or the left hemisphere or was sham, and was randomised and double blind. There was no effect on sleep stages or sleep onset latency, but the power density in the 9.75-13.25 Hz range was enhanced during the initial non-REM part of sleep. Even though the exposure was on one side of the head, both brain hemispheres were affected. This is the first study to show that EMF exposure during waking affects the EEG during subsequent sleep. The authors postulate that the changes being seen in both hemispheres suggest that structures like the thalamus could be involved. They emphasise that conclusions about possible adverse effects on human health are premature because the underlying mechanisms are unknown.

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