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

[無線周波信号は安静時の脳電図のアルファ帯に影響を与える] med./bio.

Radiofrequency signal affects alpha band in resting electroencephalogram.

掲載誌: J Neurophysiol 2015; 113 (7): 2753-2759

この研究は、無線周波RF電磁界EMF)が安静時の脳電図(EEG)に与える影響を、若い健康被験者(n=26)での二重ブラインド、カウンターバランス、クロスオーバー試験で調べた。ばく露擬似ばく露の条件下で、開眼および閉眼での安静時EEGを測定した。EEGリズムのパワースペクトルをアルファ帯(8-12Hz)で計算した。実験の前後に唾液を採取し、唾液中のコルチゾールおよびカフェインを評価した。その結果、閉眼時EEGのアルファ帯パワースペクトルが、擬似ばく露セッションに比べ、ばく露セッションで有意に低下した;両セッションで、唾液中のコルチゾールおよびカフェインに有意差はなかった、と報告している。

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研究目的(著者による)

The effects of exposure of subjects to a 900 MHz electromagnetic field (GSM) on the brain activity should be investigated in a resting EEG.

詳細情報

26 subjects (13 male, 13 female) participated in 2 sessions, respectively: exposure and sham exposure. Each session was divided into a pre-exposure part, an exposure/sham exposure part and a post-exposure part. During each part, the resting EEG with open eyes and with closed eyes was measured repeatedly in separate runs for 3 minutes per run, respectively. Two runs were measured during the pre- and post-exposure parts, respectively, and 3 runs were measured during the exposure/sham exposure part.

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 26 minutes
  • 電力: 2 W peak
  • 電力: 250 mW mean
  • SAR: 0.49 W/kg maximum (10 g)
  • SAR: 0.7 W/kg maximum (1 g)
  • SAR: 0.93 W/kg peak

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 26 minutes
Additional information GSM
Modulation
Modulation type pulsed
Duty cycle 12.5 %
ばく露装置
ばく露の発生源/構造
  • セルラ-電話
  • Nokia 6650
チャンバの詳細 dimly lit, electrically shielded room
ばく露装置の詳細 mobile phone was positioned against the left ear of subject and connected to a PC to control exposure; subjects were seated in a comfortable chair and a screen was placed in front of them to keep their eyes in a well-defined direction; interference of EEG electrodes with mobile phone was controlled; electrode impedance was controlled
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
電力 2 W peak - - -
電力 250 mW mean - - -
SAR 0.49 W/kg maximum 測定値 10 g -
SAR 0.7 W/kg maximum 測定値 1 g -
SAR 0.93 W/kg peak 測定値 - -

Reference articles

  • Ghosn R et al. (2012): [経頭蓋超音波ドップラー検査で評価した中大脳動脈血流に対するGSM900 MHzの影響]

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:
  • ばく露前
  • ばく露中
  • ばく露後

研究の主なアウトカム(著者による)

During the exposure and post-exposure part, the alpha wave power was significantly decreased in the EEG with closed eyes in the exposure session compared to the sham exposure session. All other parameters did not show any significant differences between exposure and sham exposure.
The authors conclude that exposure to a 900 MHz electromagnetic field (GSM) might influence alpha waves in the resting EEG and thus the brain activity.

研究の種別:

研究助成

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