研究のタイプ: 医学/生物学の研究 (experimental study)

[パルス高周波電磁界は人の睡眠と睡眠脳電図を変化させる] med./bio.

Pulsed high-frequency electromagnetic field affects human sleep and sleep electroencephalogram.

掲載誌: Neurosci Lett 1999; 275 (3): 207-210

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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研究目的(著者による)

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.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 900 MHz
Modulation type: pulsed
ばく露時間: intermittent, 15 min on/off, for 8 h
  • SAR: 1 W/kg maximum (10 g)

ばく露1

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
偏波
  • linear
ばく露時間 intermittent, 15 min on/off, for 8 h
Modulation
Modulation type pulsed
Duty cycle 87.5 %
Repetition frequency 217 Hz
Additional information

The pseudo GSM test signal was modulated with frequencies used by handsets and base stations having components of 2, 8, 217, 1736 Hz.

ばく露装置
ばく露の発生源/構造
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.
パラメータ
測定量 種別 Method Mass 備考
SAR 1 W/kg maximum 測定値 10 g -

ばく露を受けた生物:

方法 影響評価項目/測定パラメータ/方法

研究対象とした生物試料:
研究対象とした臓器系:
調査の時期:
  • ばく露中

研究の主なアウトカム(著者による)

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.

研究の種別:

研究助成

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