この研究は、3G 携帯電話（呼び出しモード）を15分間、頭部（耳）上に置いた場合のEEGの変化が、擬似電話機の場合に比較して相違があるか否かを実験した。また、電話機の位置が頭部と胸部（心臓の上）で違いがあるかも調べた。被験者は31人の健康な女性。全ての被験者が、ある実験日には耳、他の実験日には胸の位置での実験を受けた。実験は単ブラインド、クロスオーバーのデザインで、擬似セッションは真のセッションの前後に設定した。各セッションでEEG活動と無線周波電磁界強度が同時記録された。EEGはデルタ波、シータ波、アルファ波、ベータ徐波、ベータ速波、ガンマ波の周波数帯別の活動が分析された。EEGとRFばく露の関連について、RFを主要な影響の予測子としたマルチレベル・ランダム回帰分析を行った。その結果、アルファ波、ベータ徐波、ベータ速波、ガンマ波においてRFの影響が見られた；耳の位置での実験のデータでは関連が有意であったが､胸の位置のデータでは関連しなかった；この知見の生理学的重要性を実証するにはさらに研究が必要である､と報告している。
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The effects of an acute exposure of human subjects to a 3G mobile phone electromagnetic field on the EEG should be investigated.
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.
| 周波数 | 1.9291–1.9397 GHz |
|---|---|
| タイプ |
|
| ばく露時間 | continuous for 15 minutes |
| Additional information | exposure of ear |
| Additional information | phone was in dialing mode during exposure |
| ばく露の発生源／構造 |
|
|---|---|
| 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 |
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| SAR | 0.69 W/kg | - | - | partial body | for head, value according to manufacturer |
| 周波数 | 1.9291–1.9397 GHz |
|---|---|
| タイプ |
|
| ばく露時間 | continuous for 15 minutes |
| Additional information | exposure of chest |
| Additional information | phone was in dialing mode during exposure |
| ばく露の発生源／構造 |
|
|---|---|
| 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 |
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| SAR | 0.69 W/kg | - | - | partial body | for head, value according to manufacturer |
The multilevel random regression analysis showed that exposure of the chest did not result in significant changes in the EEG compared to the sham exposures, probably due to the distance between the chest and the brain. However, the activity of all brain waves, except for delta waves, changed significantly due to exposure of the ear in comparison to the sham exposures, with stronger effects on the ipsilateral side of exposure.
The authors conclude that an acute exposure of human subjects to a 3G mobile phone electromagnetic field could have an effect on the EEG with an increased activity in the alpha wave, beta wave and gamma wave bands.
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