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

[脳は携帯電話の影響を受けるか?:安静時覚醒度のEGG研究] med./bio.

Is the brain influenced by a phone call? An EEG study of resting wakefulness.

掲載誌: Neurosci Res 2005; 53 (3): 265-270

この研究は、20人の健康被験者を用いて、電磁界EMFばく露が安静時の脳電図(EEG)活動性およびその時間的推移に及ぼす影響を調べた。被験者を無作為に2群に分け、二重ブラインド法で、一方はEEGの記録前に、他方はEEG記録中に、典型的な携帯電話信号(217Hzで変調した902.40 MHz, 平均電力0.25 W)のばく露を与えた。その結果、ばく露時には、ベースライン時および擬似ばく露時に比較して、EEGのアルファ帯のスペクトルパワーに影響が見られた;この影響は、EEG記録前のばく露よりも記録中のばく露の方が大きかった、と報告している。

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研究目的(著者による)

1) To test whether a Global System for Mobile Communication (GSM) signal affects human resting EEG and 2) to test when this influence is most evident on EEG spectral power, i.e. whether this is restricted to the period of real exposure or if it continues after exposure cessation.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 902.4 MHz
Modulation type: pulsed
ばく露時間: continuous for 45 min

ばく露1

主たる特性
周波数 902.4 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 45 min
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
ばく露装置
ばく露の発生源/構造
  • セルラ-電話
  • transmitting at maximum power
Distance between exposed object and exposure source 1.5 cm
ばく露装置の詳細 A helmet was used to hold the phone in the normal position for use at 1.5 cm from the left ear.
Additional information Subjects were submitted to three different conditions in double-blind random order: baseline, real exposure, and sham exposure, with at least 48 h between sessions. They wore the helmet in all sessions, but during baseline, there was no phone, and during sham exposure, the phone was switched off. Subjects did not hear any voices or sounds from the phone, and white noise was delivered by means of a loudspeaker during all sessions.
パラメータ
測定量 種別 Method Mass 備考
電力 2 W peak - - -
電力 0.25 W mean - - -
SAR 0.5 W/kg maximum 測定値 - -

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:
  • ばく露中
  • ばく露後

研究の主なアウトカム(著者による)

The data show that, under real exposure as compared to baseline and sham exposure conditions, EEG spectral power was influenced in some bins of the alpha wave band. This effect was greater when the electromagnetic field was on during the EEG recording session than before it.
The present findings lend further support to the idea that pulsed high-frequency electromagnetic fields can affect normal brain functioning, also if no conclusions can be drawn about the possible health effects.

研究の種別:

研究助成

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