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To study the effect of microwaves modulated at different frequencies (40 and 70 Hz) on human electroencephalographic (EEG) rhythms.
15 subject participated (eight males, 7 females). All subjects passed two EEG recordings on two different days under microwave exposure and sham exposure.
|ばく露時間||40 min. = 10 cycles of each modulation frequency (1 min. on - 1 min. off)|
|Distance between exposed object and exposure source||10 cm|
|ばく露装置の詳細||antenna placed near the left side of the test person's head|
|Sham exposure||A sham exposure was conducted.|
450 MHz microwave exposure modulated at 40 Hz caused statistically significant changes in the EEG time variability (i.e. LDLVP) in four subjects (26.7%) and energy variations (increase in energy of beta wave (beta 2) frequency band) in two subjects (13.3%). The LDLVP analysis and relative changes in EEG energy did not detect significant effects of microwave exposure for the whole group.
Statistical evaluation performed for the whole group revealed significant difference between exposed and sham exposed EEG only for the beta ratio (as parameter for energy distribution).
In conclusion, the main trend of changes in the present study was the increase in the EEG beta wave energy and the effect was more evident at the modulation frequency closer to the physiological EEG rhythms (40 Hz).