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Abstract
The effects of intermittent (1 sec on/1 sec off) 45-Hz magnetic fields on quantitative electroencephalogram (EEG) were studied using 12 female rats. The animals were exposed for 24 hr to three different conditions: 1000 A/m (1.26 mT), 100 A/m (126 μT), and sham exposure. The cortical EEG was recorded before and after each exposure, and the power spectrum of the EEG was calculated. Exposure at 100 A/m produced statistically significant decreases in the delta (1-4 Hz) and theta (4-8 Hz) bands and increased activities in the beta (12-20 Hz) and 30-60 Hz bands. Smaller changes were seen at 1000 A/m than at 100 A/m. The changes seen were more pronounced 15 min after the end of exposure than immediately after it. At 30 min after exposure most differences from the pre-exposure values had disappeared.