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

[覚醒時のパルス状高周波電磁界へのばく露はヒトのEEGに影響する] med./bio.

Exposure to pulsed high-frequency electromagnetic field during waking affects human sleep EEG.

掲載誌: Neuroreport 2000; 11 (15): 3321-3325

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研究目的(著者による)

To investigate whether electromagnetic field emitted by digital cellular phones affects brain physiology.

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: continuous for 30 min
  • 電力: 2.2 W average over time (antenna input)
  • SAR: 1 W/kg maximum (10 g) (spatial peak)
  • SAR: 0.28 W/kg average over mass (brain) (±70%, exposed hemisphere)

ばく露1

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 30 min
Modulation
Modulation type pulsed
Duty cycle 87.5 %
Repetition frequency 217 Hz
Additional information

modulation as in the reference article simulating the main frames of the GSM system (2, 8, 217, 1736 Hz)

ばく露装置
ばく露の発生源/構造
  • planar antennas
Distance between exposed object and exposure source 11 cm
ばく露装置の詳細 Subjects were sitting on a chair with their heads between to plates to ensure a well-defined position with respect to two matched planar antennas mounted on both sides of the head at a distance of 11 cm from the ear with their centres 4.2 cm vertically above the ear canal.
Additional information The experiment consisted of three sessions one week apart involving right or left hemisphere and sham exposure scheduled according to a randomized, double-blind, cross-over design.
パラメータ
測定量 種別 Method Mass 備考
電力 2.2 W average over time - - antenna input
SAR 1 W/kg maximum 測定値および計算値 10 g spatial peak
SAR 0.28 W/kg average over mass 測定値および計算値 brain ±70%, exposed hemisphere

Reference articles

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:
  • ばく露後

研究の主なアウトカム(著者による)

Compared with the sham exposure, spectral power of the EEG in non-rapid eye movement sleep (REM sleep) was increased. The maximum rise occured in the 9.75-13.25 Hz band during the initial part of sleep. Unilateral radiation induced no hemispheric asymmetry of EEG power. The data show that exposure during waking modifies the EEG during subsequent sleep. Thus the changes of brain function induced by pulsed high-frequency electromagnetic fields outlast the radiation period.

研究の種別:

研究助成

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