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

[携帯電話電磁界は局所大脳血流と睡眠時、覚醒時EEGを変える] med./bio.

Electromagnetic fields, such as those from mobile phones, alter regional cerebral blood flow and sleep and waking EEG.

掲載誌: J Sleep Res 2002; 11 (4): 289-295

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研究目的(著者による)

Two questions were adressed and investigated: (1) Does exposure to electromagnetic fields modify waking regional cerebral blood flow (rCBF)?, (2) Is pulse modulation of the signal critical for the EEG effect?

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 900 MHz
Modulation type: pulsed
ばく露時間: continuous for 30 min
  • SAR: 1 W/kg maximum (10 g)
ばく露2: 900 MHz
Modulation type: CW
ばく露時間: continuous for 30 min
  • SAR: 1 W/kg maximum (10 g)

ばく露1

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 30 min
Modulation
Modulation type pulsed
Duty cycle 12.5 %
Repetition frequency 217 Hz
Additional information

A 'handset-like' signal was used as emitted by GSM mobile phones with modulation components at 2, 8, 217, 1736 Hz.

ばく露装置
ばく露の発生源/構造
  • two planar antennas
ばく露装置の詳細 Subjects sat on a chair with their heads between two plates to ensure a well-defined position with respect to two planar antennas (see reference article). The left side of the head was exposed.
Additional information In one experiment the subjects were exposed to pulse modulated EMF or sham-exposed. In the other experiment the following three exposure conditions were used: pulse modulated EMF, continuous wave EMF, or sham control. In both experiments a double-blind crossover design was used, and intervals between exposures were at least 1 week.
パラメータ
測定量 種別 Method Mass 備考
SAR 1 W/kg maximum 測定値および計算値 10 g -

ばく露2

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 30 min
Modulation
Modulation type CW
ばく露装置
ばく露の発生源/構造
  • E1と同じ装置
パラメータ
測定量 種別 Method Mass 備考
SAR 1 W/kg maximum 測定値および計算値 10 g -

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:
  • ばく露後

研究の主なアウトカム(著者による)

(1) Pulse-modulated electromagnetic fields (EMF) alters waking rCBF and (2) pulse modulation of EMF is necessary to induce waking and sleep EEG-changes.

研究の種別:

研究助成

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