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

[脳は3G携帯電話放射のピークを感じ取るか?:実験的研究の探索的で詳細な分析] med./bio.

Does the brain detect 3G mobile phone radiation peaks? An explorative in-depth analysis of an experimental study.

掲載誌: PLoS One 2015; 10 (5): e0125390

この研究は、第3世代携帯電話放射のピークによる事象関連電位(ERP)が現れるか否かを、健康な女性被験者(n=31)での単ブラインド、クロスオーバーのデザインで試験した。携帯電話および見かけ上差異のない擬似電話(いずれもミュートモードに設定)を被験者に装着させ、精密な時間スケジュールで別の部屋から電話をかけた。擬似−真−擬似条件の順で、各条件15分間の一連の実験を1セッションとし、携帯電話の装着位置を耳および心臓とした2つのセッションを別々の日に実施した。脳電図(EEG)と無線周波放射レベル(アンテナの位置で測定)を同時記録し、真のばく露条件では、放射ピークの開始の200ミリ秒前から1000ミリ秒後までの1200ミリ秒間、擬似ばく露条件では無作為選出した1200ミリ秒間のそれぞれにおけるERPデータを分析した(Event Related Fixed Interval Area(ERFIA)法)。刺激後240-500ミリ秒の時間範囲でのERFIAについてマルチレベル分析した結果、(電話器の位置)×(ばく露)との交互作用効果が前頭および頭頂の皮質において有意であった(すなわち、耳の位置での真のばく露においてのみ、その時間範囲での皮質活動上昇が見られた);EEGトポグラフィの事後分析で、刺激後500-1000ミリ秒の時間範囲に2つ目の有意な活動上昇がほぼ全てのEEG測定部位で見られた、と報告している。

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研究目的(著者による)

The effects of intensity peaks of an acute exposure of human subjects to a 3G mobile phone electromagnetic field on event related potentials in the EEG should be investigated.

詳細情報

The present study reanalyzed the data acquired by Roggeveen et al. 2015.
31 young, female subjects were exposed on two different days within a 1-hour test session, respectively. On one day, the mobile phone was placed at the subject's ear and on the other day it was placed on the subject's chest (cardiac region). In each session, 15 minutes of sham exposure as pre-exposure condition, then 15 minutes of exposure and finally 15 minutes of sham exposure as post-exposure condition were recorded. Additionally, 15 minutes at the beginning or at the end of each session were randomly chosen for sham exposure without EEG recording to ensure blinding.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 1.9291–1.9397 GHz
exposure of ear
  • SAR: 0.69 W/kg (for head, value according to manufacturer)
  • 電力密度: 5.6 W/m² maximum (during exposure peaks)
ばく露2: 1.9291–1.9397 GHz
exposure of chest
  • SAR: 0.69 W/kg (for head, value according to manufacturer)
  • 電力密度: 5.6 W/m² maximum (during exposure peaks)

General information

background radiation level was 0.1 W/m2

ばく露1

主たる特性
周波数 1.9291–1.9397 GHz
タイプ
  • electromagnetic field
Additional information exposure of ear
Additional information phone was in dialing mode and muted during exposure
ばく露装置
ばく露の発生源/構造
  • セルラ-電話
チャンバの詳細 an electrically non-shielded room
ばく露装置の詳細 a dialing mobile phone was fixed to the left ear (comparable to a typical dialing position at an angle of approximately 45 degrees) with an elastic band; the experimenter entered the room after each 15-minutes (sham) exposure session and changed the phone
Sham exposure A sham exposure was conducted.
Additional information non-functioning mobile phone replicas were used for sham exposure
パラメータ
測定量 種別 Method Mass 備考
SAR 0.69 W/kg - - partial body for head, value according to manufacturer
電力密度 5.6 W/m² maximum 測定値 - during exposure peaks

ばく露2

主たる特性
周波数 1.9291–1.9397 GHz
タイプ
  • electromagnetic field
Additional information exposure of chest
Additional information phone was in dialing mode and muted during exposure
ばく露装置
ばく露の発生源/構造
  • セルラ-電話
チャンバの詳細 an electrically non-shielded room
ばく露装置の詳細 a dialing mobile phone was fixed to the chest (adjacent to the left side of the sternum, bordering the sternoclavicular joint) with an elastic band; the experimenter entered the room after each 15-minutes (sham) exposure session and changed the phone
Sham exposure A sham exposure was conducted.
Additional information non-functioning mobile phone replicas were used for sham exposure
パラメータ
測定量 種別 Method Mass 備考
SAR 0.69 W/kg - - partial body for head, value according to manufacturer
電力密度 5.6 W/m² maximum 測定値 - during exposure peaks

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:
  • ばく露前
  • ばく露中
  • ばく露後

研究の主なアウトカム(著者による)

Exposure of the ear resulted in a significant increase of the EEG activity in the frontal and central cortical regions compared to sham exposure conditions. Further analyses of the ear exposure condition showed a significant increase of activity in the 500-1000 ms post-exposure peak interval for almost every EEG location measured.
The authors conclude that intensity peaks of an acute exposure of the human ear to a 3G mobile phone electromagnetic field could result in event related potentials in the EEG, what indicates that the brain can detect these intensity peaks. However, the biological relevance of this is unknown.

研究の種別:

研究助成

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