この研究は、デジタル携帯電話端末から放射される電磁界（EMF）が脳に影響を与える否かを、健康で若いボランティアによる終夜睡眠実験で調べた。ばく露夜は、15分オン、15分オンの断続的ばく露（900MHz；SAR 1 W/kg）を、終夜の睡眠中、被験者に与えた。対照夜に、擬似ばく露実験を行った。その結果、ばく露夜は、対照夜に比べ、入眠後の覚醒時間が18分から12分に減少した；ノンレム睡眠中の脳電図のスペクトラムパワーが増大した。最大の増加は、睡眠の初めの時間に、10-11Hzと13.5-14Hz帯で起き、その後おさまった、と報告している。
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To study whether electromagnetic field emitted by digital cellular phone affects the brain, subjects were exposed during an entire night-sleep episode to an intermittent schedule consisting of alternating 15 minutes "on" and 15 minutes "off" intervals.
Modulation type: pulsed
ばく露時間: intermittent, 15 min on/off, for 8 h
|ばく露時間||intermittent, 15 min on/off, for 8 h|
|Distance between exposed object and exposure source||30 cm|
|チャンバの詳細||Two sound insulated and temperature controlled bedrooms with absorber walls placed around the bed to approximate an anechoic room and ensure a relatively uniform exposure.|
|ばく露装置の詳細||There was an array of three λ/2 dipole antennas behind each bed at a distance of 30 cm from the head of the recumbent subject. The polarization of the field was perpendicular to the surface of the bed.|
|Additional information||The experiment consisted of two sessions one week apart. EMF or sham exposure was given according to a randomized, placebo controlled, double-blind study, cross-over study design. During an adaptation night per session in a different room, the absorber walls were mimicked by fabric.|
|SAR||1 W/kg||maximum||測定値||10 g||-|
Compared with a control night the amount of waking after sleep onset was reduced from 18 to 12 min. Spectral power of the EEG in non-rapid eye movement sleep (REM sleep) was increased. The maximum rise occured in the 10.0-11.0 Hz and 13.5-14.0 Hz bands during the initial part of sleep and then subsided. The data demonstrate that pulsed high-frequency electromagnetic field in the range of cellular phones may promote sleep and modify sleep EEG.