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

[携帯電話への短時間ばく露の反復は精神運動能力に影響しない] med./bio.

Psychomotor performance is not influenced by brief repeated exposures to mobile phones.

掲載誌: Bioelectromagnetics 2008; 29 (3): 237-241

【目的】GSM携帯電話の短期的ばく露の反復が精神運動機能に与える影響に蓄積的現象が存在するか否かを調査すること。【方法】被験者は24名。15分間のGSM信号ばく露の後に、聴覚単純反応時間課題と手指の連続的タッピング課題に二つを与えることを3回繰り返した。GSM信号は、902.40 MHzの217 Hz変調波; ピーク電力2W; 平均電力0.25W; SAR.0.5 W/kgである。【結果】蓄積的影響は検出されなかった。ただし、統計的に有意ではないが、ばく露による反応時間短縮の傾向が見られた。

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研究目的(著者による)

To study the presence of a cumulative effect of brief and repeated exposures (3 X 15 min.) to a GSM mobile phone on psychomotor functions.

詳細情報

24 subjects participated.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 902.4 MHz
Modulation type: pulsed
ばく露時間: intermittent, 10 min off/15 min on, for 85 min
  • 電力: 2 W peak
  • 電力: 0.25 W mean
  • SAR: 0.5 W/kg maximum (10 g) (at the temporal lobe)

ばく露1

主たる特性
周波数 902.4 MHz
タイプ
  • electromagnetic field
ばく露時間 intermittent, 10 min off/15 min on, for 85 min
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
Additional information

basic GSM signal with modulation components of 8.33 and 217 Hz

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 1.5 cm
チャンバの詳細 The subjects sat on an armchair at a distance of 70 cm in front of a loudspeaker inside a shielded, soundproof and temperature-controlled room.
ばく露装置の詳細 The mobile phone was held by a helmet in the normal use position (antenna oriented to the temporoparietal area) at 1.5 cm from the right ear tragus. An identical phone, but without battery, was placed on the left side of the helmet to balance the weight.
Sham exposure A sham exposure was conducted.
Additional information Each participant attended two experimental sessions, one week apart, providing either real or sham exposure in counterbalanced order and following a double-blind paradigm. Each session lasting 85 min comprised four 10-min phases of data collecting (T0-baseline, T1, T2, T3) and between them, three 15-min phases of real or sham exposure.
パラメータ
測定量 種別 Method Mass 備考
電力 2 W peak - - -
電力 0.25 W mean - - -
SAR 0.5 W/kg maximum 測定値 10 g at the temporal lobe

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)

The data showed no cumulative effects of brief and repeated electromagnetic field exposure on human psychomotor performance, although there was a non-statistical trend to shorter reaction times. In conclusion, these findings show an absence of effects with these particular exposure conditions.

研究の種別:

研究助成

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