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

[視覚運動系反応時間に対する30分間の携帯電話使用の影響] med./bio.

Effects of thirty-minute mobile phone use on visuo-motor reaction time

著者: Terao Y, Okano T, Furubayashi T, Ugawa Y
掲載誌: Clin Neurophysiol 2006; 117 (11): 2504-2511
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この研究は、携帯電話から放出されるパルス高周波電磁界（パルスEMF）へのばく露が認知タスクの遂行成績に短期的な影響を与えるか否かをボランティア実験で調べた。二重ブラインド化、カウンターバランス・クロスオーバーデザインが採用された。健常な被験者16人は、30分間のパルスEMFばく露または擬似ばく露の前および後に、予告刺激付き選択反応時間タスク（PCRT）を遂行した。視覚的な予告刺激に対し決められた運動反応（ボタン押しなど）を選択し実行するタスクで、選択反応時間（RT：予告刺激が出てから手が動き出すまでの時間）および運動時間（MT：手が動き出してから反応完了までの時間）を測定した。その結果、：予告刺激のさまざまな条件下で測定されたRTおよびMTは、パルスEMFばく露または擬似ばく露の影響を受けなかった、と報告している。

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研究目的（著者による）

To study whether exposure to pulsed radiofrequency electromagnetic field emitted by a mobile phone has short-term effects on the visuo-motor choice reaction time and movement time.

詳細情報

16 subjects participated. Within the choice reaction time task the subjects had to press one of two buttons with left or right hand as quickly as possible after the go-signal. A precue preceding this conveyed full, partial or no advance information (hand and/or button), such that reaction time shortened with increasing amount of information. The precuing effect has been taken to reflect motor preparation.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 800 MHz
Modulation type: pulsed
ばく露時間: continuous for 30 min
  • 電力: 0.8 W peak
  • 電力: 0.27 W mean
  • SAR: 0.054 W/kg average over mass (10 g) (± 0.02 W/kg)

General information

The exposure setup was the same as described in [Arai et al., 2003].

ばく露1

主たる特性
周波数 800 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 30 min
Modulation
Modulation type pulsed
Pulse width 6.7 ms
Repetition frequency 50 Hz
Additional information

3 channel TDMA with π/4 shifted quadrature phase-shift keying
ばく露装置
ばく露の発生源／構造
  • セルラ－電話
  • handset connected to a communication tester, at maximum output
Distance between exposed object and exposure source 2 cm
チャンバの詳細 The subjects were comfortably seated in a chair.
ばく露装置の詳細 The subjects held the handset over the right ear in a normal use position and spoke to one of the examiners through the air. The antenna was located about 2 cm from the head and 3 cm from the brain tissue. The auditory circuitry of the handset was disabled.
Sham exposure A sham exposure was conducted.
Additional information A double blind, counterbalanced crossover design was used. The sessions under real and sham exposure were separated by at least 7 days.
パラメータ
測定量 値 種別 Method Mass 備考
電力 0.8 W peak - - -
電力 0.27 W mean - - -
SAR 0.054 W/kg average over mass 測定値 10 g ± 0.02 W/kg
測定および計算の詳細

SARs in the brain area (30 mm below the skull) were measured using a phantom system as recommended by IEC [2005] holding the handset at several positions, the results of which did not differ significantly.

Reference articles

  • Arai N et al. (2003): [携帯電話の30分間の使用は中枢聴覚系に短期的有害影響をもたらさない]

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
  • ばく露後

研究の主なアウトカム（著者による）

The reaction times and movement times under different conditions of precue information were not affected by exposure to the cell phone or by sham exposure. In conclusion, 30 minutes of mobile phone use has no significant short-term effect on the cortical visuo-motor processing.

研究の種別:

研究助成

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