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

[携帯電話の弱い電磁界(GSM,UMTS)がj事象関連電位および認知機能に与える影響] med./bio.

Effects of weak mobile phone - electromagnetic fields (GSM, UMTS) on event related potentials and cognitive functions.

掲載誌: Bioelectromagnetics 2008; 29 (6): 488-497

背景:最新の携帯電話機が放射する900から2000MHzの範囲の電磁界は、携帯電話使用者の安寧、注意神経学的パラメータに影響があることが示唆されている。これまでGSMについては多くの研究が行われているが、UMTSに関するものはほとんど行われていない。目的:1950 MHz UMTS (SARは0.1 および1 W/kg) と900 MHzパルス波GSM (1 W/kg)の2種の電磁界を片方の頭側に与えた場合の影響を、視覚誘発電位(後頭部P100)、持続的課題遂行テストの事象関連電位P300、聴覚誘発電位(中央部N100)、オドボール課題中のP300、代表的な行動学的パラメータ、反応時間、誤反応について調べること。方法:被験者は健常で右利きの15人。二重盲検、無作為、交差法の検査手順が用いられた。結果:UMTS群、GSM群のいずれにおいても、測定したパラメータに擬似ばく露群に比較して有意な変化は生じなかった。健康携帯電話使用者に対する電磁界の有害な影響を示す証拠は得られなかった。

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研究目的(著者による)

This study was conducted to evaluate the effects of both types presented mobile phone electromagnetic fields, 1950 MHz UMTS and pulsed 900 MHz GSM, on event related potentials and cognitive function in human.

詳細情報

15 healthy, right handed, male subjects (aged between 20-35 years) participated. Each subject performed five sessions at 1-week intervals, each at the same day and the same time.
The maximal spatial peak specific absorption rate did not exceed one half of the value of 2 W/kg proposed by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) as the limit for localized exposure.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 0.9 GHz
Modulation type: pulsed
ばく露時間: continuous for about 30 min
  • SAR: 1 W/kg maximum (10 g) (spatial peak in the head)
ばく露2: 1.95 GHz
ばく露時間: continuous for about 30 min
  • SAR: 0.1 W/kg maximum (10 g) (spatial peak in the head)
  • SAR: 1 W/kg maximum (10 g) (spatial peak in the head)

General information

Each subject performed one training and four exposure sessions at 1-week intervals, each at the same day and time. Computer controlled EMF or sham exposure was applied in a double-blind randomized crossover design.

ばく露1

主たる特性
周波数 0.9 GHz
タイプ
  • electromagnetic field
ばく露時間 continuous for about 30 min
Modulation
Modulation type pulsed
Additional information

GMSK (Gaussian minimum shift keying) signal modulated with pulses of 2, 8, and 217 Hz

ばく露装置
ばく露の発生源/構造
  • small broadband antenna
チャンバの詳細 The recording area was shielded with EMF radiation absorbers, separated by a curtain, dimly lit, and supplied with fresh air. After fixation of the electrodes on the scalp, subjects were seated on a comfortable chair in front of a table with a chin support at a distance of 70 cm to a screen.
ばく露装置の詳細 Subjects were exposed by a small broadband antenna placed like a mobile phone directly over the left ear.
Sham exposure A sham exposure was conducted.
Additional information The RF or sham exposure period was preceded by 4 min and followed by 6 min of recording under sham exposure.
パラメータ
測定量 種別 Method Mass 備考
SAR 1 W/kg maximum - 10 g spatial peak in the head

ばく露2

主たる特性
周波数 1.95 GHz
タイプ
  • electromagnetic field
ばく露時間 continuous for about 30 min
Additional information UMTS
Modulation
Modulation type cf. additional information
Additional information

UMTS (generic handset-like W-CDMA signal with fast power control of 1500 Hz and fading characteristics)

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 0.1 W/kg maximum - 10 g spatial peak in the head
SAR 1 W/kg maximum - 10 g spatial peak in the head

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)

Not any evidence for a deleterious effect of the electromagnetic fields on healthy mobile phone users was found.

研究の種別:

研究助成

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