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

[携帯電話のマイクロ波はヒトの徐波脳電位に影響する] med./bio.

Microwaves emitted by cellular telephones affect human slow brain potentials

著者: Freude G, Ullsperger P, Eggert S, Ruppe I
掲載誌: Eur J Appl Physiol 2000; 81 (1-2): 18-27
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携帯電話からの電磁界（EMF）の徐波脳は(SP)に対する影響を、6ヶ月間間をあけて、2回の実験を行った。最初の実験は、複雑な視覚モニタリングタスク（VMT）時のEMFばく露で、SPの有意な減少が見られた。これは、2回目の実験で再現された。VMTに加え、SPに対するEMFの影響をさらに2つの方法調べた：BPを誘発する単純に指を動かすタスクとCNVを誘発する2通りの刺激タスク。VMTと比較して、BPとCNVタスクにはEMFの有意な影響はなかった。ヒトの情報処理過程に対する選択的なEMF効果を説明できるが、ヒトの行動、健康への影響はなかった。

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研究目的（著者による）

To study the influence of electromagnetic fields emitted by cellular phones on preparatory slow brain potentials in two experiments, about 6 months apart.

詳細情報

Preparatory slow brain potentials occur prior to voluntary initiated movements (Bereitschaftspotenzial, BP) or between a warning (S1) and an imperative stimulus (S2) (contingent negative variation, CNV). Preparatory processes are of fundamental importance for effective motor and mental performance in the goal-directed behaviour.
CNV: In the current study the appearance of a pointer of a symbolised clock at the 12 o'clock position represented the S1 stimulus, the beginning of the pointer movement represented the S2 stimulus (as soon as the pointer started to move, the subjects had to stop the pointer by pressing a mouse key).
BP: To investigate the BP the subjects were asked to press a key with their right index finger 30 times at self-paced intervals (simple finger movements).

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 916.2 MHz
Modulation type: pulsed
ばく露時間: continuous for about 3 to 4 min per task
  • 電力: 2.8 W peak
  • 電力: 350 mW average over time
  • SAR: 1.42 mW/g average over mass (1 g)
  • SAR: 0.882 mW/g average over mass (10 g)

ばく露1

主たる特性
周波数 916.2 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for about 3 to 4 min per task
Modulation
Modulation type pulsed
Pulse width 577 µs
Repetition frequency 217 Hz
Additional information

no acoustic signal transmission
ばく露装置
ばく露の発生源／構造
  • セルラ－電話
ばく露装置の詳細 The mobile phone was positioned in direct contact to the left ear of the subjects, who sat in an artificially illuminated room in front of a computer monitor. The telephone antenna was fed by a generator and amplifier located in an adjacent room and connected via a coaxial cable.
Additional information Each task was performed in two blocks with and without EMF exposure in counterbalanced order.
パラメータ
測定量 値 種別 Method Mass 備考
電力 2.8 W peak 測定値 - -
電力 350 mW average over time 測定値 - -
SAR 1.42 mW/g average over mass 測定値 1 g -
SAR 0.882 mW/g average over mass 測定値 10 g -
測定および計算の詳細

Power was measured using a power meter at the telephone connector. SAR measurements performed in 1996 on the basis of the CENELEC standard showed the peak values indicated. At the depth of about 14 mm, SAR amounted to about 25% of the energy at the skin surface.

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

研究の主なアウトカム（著者による）

In the first experiment, a significant decrease of slow brain potentials was found during exposure to electromagnetic fields in a complex visual monitoring task and this effect was replicated in the second experiment. No significant electromagnetic field effects were found in the Bereitschaftspotenzial and CNV tasks. The results accounted for a selective electromagnetic field effect on particular aspects of human information processing. However, they do not indicate any influence on human well-being and health.

研究の種別:

研究助成

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