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

[携帯電話はヒトの脳血流に影響する] med./bio.

Mobile phone affects cerebral blood flow in humans.

掲載誌: J Cereb Blood Flow Metab 2006; 26 (7): 885-890

携帯電話は、無線周波電磁界EMF)を発生するが、そのヒト脳への生理的影響は知られていない。PETスキャンを使用して、携帯電話使用事の健常者の局所脳血流(rCBF)への影響を調べた。PETデータは、12名の男性被験者で二重盲検法環境下で、コンピュータ制御付き言語記憶作業で求めた。試験的、客観的なボクセルベースの統計分析からは、使用中の携帯電話アンテナ下でrCBFの局所的な減少を引き起こしたことが得られた。結果はす商業用の携帯電話のEMFは人のrCBFに影響を及ぼすことが分かった。これらの結果は、EMFがニューロンの活動変化をもたらすという仮説と一致する。

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研究目的(著者による)

To study the effects of a mobile phone on regional cerebral blood flow in 12 healthy humans during exposure to electromagnetic field, while performing a verbal working memory task.

詳細情報

A substantially more sensitive experimental design (concerning the exposure) than in a previous study (publication 10384) was used.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 902 MHz
Modulation type: pulsed
ばく露時間: 51 mins
  • SAR: 1.51 W/kg peak
  • SAR: 0.743 W/kg average over mass (10 g)

ばく露1

主たる特性
周波数 902 MHz
タイプ
  • electromagnetic field
波形
  • pulsed
ばく露時間 51 mins
Modulation
Modulation type pulsed
Pulse width 0.577 ms
Repetition frequency 217 Hz
Additional information

Discontinuous mode was not activated.

ばく露装置
ばく露の発生源/構造
  • セルラ-電話
Distance between exposed object and exposure source 17 mm
ばく露装置の詳細 The phone was placed between the subject`s head and the head rest of a positron emission tomography (PET) scanner parallel to the medial plane. The antenna was located circa 17 mm from the surface of the skull over the subject`s left inferior temporal lobe.
Sham exposure A sham exposure was conducted.
Additional information In order to eliminate audio clues the phone`s loudspeaker was removed and its battery was removed. It was operated with an external power source located 3 m away. The subjects were asked to insert an ear plug into the left ear. The EMF/sham exposure was started at the same moment as the transmission scan. After a 9 min transmission scan, each subject was scanned 14 times, out of which the first or the last seven scans were obtained during a constant EMF or sham exposure.
パラメータ
測定量 種別 Method Mass 備考
SAR 1.51 W/kg peak 測定値 - -
SAR 0.743 W/kg average over mass 測定値 10 g -

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)

The data suggest that the electromagnetic field emitted by a mobile phone affects regional cerebral blood flow in humans. The results revealed that a mobile phone in operation induces a local decrease in regional cerebral blood flow beneath the antenna in the inferior temporal cortex and an increase more distantly in the prefrontal cortex.
The electromagnetic field had no effects on reaction times or the accuracy of responses in the working memory task.

研究の種別:

研究助成

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