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

[電磁界の時間はヒトの行動と鼓膜温に影響する] med./bio.

Time-course of electromagnetic field effects on human performance and tympanic temperature

著者: Curcio G, Ferrara M, De Gennaro L, Cristiani R, D'Inzeo G, Bertini M
掲載誌: NeuroReport 2004; 15 (1): 161-164
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この研究は、ヒトの認知・行動タスクの成績および鼓膜温に対する電磁界（EMF）の影響の時間的経過を調べた。20人の健康な被験者を無作為に2群に分け、二重ブラインド法で、一方は、タスク試験の前に902.40MHz EMF にばく露し、他方は、タスク試験のデータ収集中に同じ信号にばく露した。実施した4種のタスクは、聴覚的単純反応時間試験、視覚的探索試験、引き算タスク、聴覚的選択反応時間タスクである。タスクセッション中に5回、鼓膜温を測定した。その結果、ばく露環境下では、単純反応時間および選択反応時間の両方の成績が改善され、ばく露を受けた部位の温度上昇が確認された；このような影響が表れるまでには最短でも25分間のEMFばく露が必要であった、と報告している。

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研究目的（著者による）

To test the existence of a time-course of the effects of electromagnetic fields on psycho-motor (reaction times) and cognitive performance (visual search and arithmetic subtraction), and on the tympanic temperature of human subjects.

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: continuous for 45 min

General information

Every subject was submitted to three sessions in counterbalanced order: a baseline, a real, and a sham exposure session with at least 48 h between tests, following a double-blind paradigm.

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 continuous for 45 min
Additional information International Electrotechnical Commission. Procedure to measure the Specific Absorption Rate (SAR) for hand-held mobile wireless devices in the frequency range of 300 MHz to 3 GHz. IEC 106/49/Committee Draft, 2002.
Modulation
Modulation type pulsed
Additional information

typical GSM RF-ON signal
ばく露装置
ばく露の発生源／構造
  • セルラ－電話
  • set by a test card to transmit at maximum power
Distance between exposed object and exposure source 1.5 cm
ばく露装置の詳細 The mobile phone was held by means of a helmet in the classical use position at a distance of 1.5 cm from the left ear. A second but inactive phone was positioned on the right side of the head in order to balance the weight. During the baseline session, subjects wore only the helmet without the mobile phones.
Sham exposure A sham exposure was conducted.
Additional information Every session consisted of a 45 min prerecording period, followed by 45 min of data recording. Subjects were randomly assigned to two groups being exposed before the testing session or during the data collecting session itself.
パラメータ
測定量 値 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 - -
測定および計算の詳細

The SAR was previously measured as in the IEC standards of compliance using a head phantom filled with semi-liquid muscle equivalent material and positioning a miniature field probe 1 cm in depth, over a grid of a few millimetres at the minimal distance from the shell containing the material, under the ear region.

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:
調査の時期:
  • ばく露中
  • ばく露後

研究の主なアウトカム（著者による）

Data indicated an improvement of both simple- and choice-reaction times and an increase of local temperature on the exposed region under the active exposure. There was a clear time-course of the reaction time and temperature data, indicating that performance and physiological measures need a minimum of 25 min of electromagnetic field irradiation to show appreciable changes.

研究の種別:

研究助成

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