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

[マレーシア人の認知タスクの成績、体温、心拍数、および血圧に対する携帯電話基地局短期ばく露の影響] med./bio.

Effect of short-term mobile phone base station exposure on cognitive performance, body temperature, heart rate and blood pressure of Malaysians

著者: Malek F, Rani KA, Rahim HA, Omar MH
掲載誌: Sci Rep 2015; 5: 13206
RISフォーマットで参考文献をダウンロード

この研究は、電界強度1V/mの典型的なGSMおよびUMTS 信号への短期ばく露が被験者の認知タスクの成績および生理学的なパラメータ（体温、心拍数、血圧）に影響を及ぼすか否かを調べるために、カウンターバランスした無作為化単ブラインド試験を実施した。被験者は200人（半数は「電磁界が原因と本人は信じる非特異的環境不耐症」（IEI-EMF）、残りの半数は非IEI-EMF）は、真および擬似のばく露中にケンブリッジ神経心理学的自動検査（CANTAB）から選択した4種の課題をコンピュータ上で実施した。反応時間、高速視覚処理、対連合学習、空間スパンの各課題である。その結果、IEI-EMF、非IEI-EMFの両群において、認知タスクの成績および生理学的パラメータのいずれについても、真および擬似のばく露による有意差は見られなかったと報告している。

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研究目的（著者による）

The effects of exposure to a 945 MHz (GSM 900), 1840 MHz (GSM 1800) or a 2140 MHz (UMTS) electromagnetic field on physiological changes and cognitive performance in healthy and electrosensitive subjects should be investigated.

詳細情報

A total of 100 non-electrosensitive subjects and 100 electrosensitive subjects (persons who had previously reported complaints and have attributed these to GSM or UMTS exposure) participated in one session. There, they were exposed to 4 conditions: GSM900, GSM1800, UMTS and sham exposure in a counterbalanced, random order. Each condition was divided into three parts which involved pre-exposure, during exposure, and post-exposure.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 945 MHz
Modulation type: pulsed
ばく露時間: not specified
GSM 900 signal
  • 電界強度: 1 V/m (power received by each subject)
  • 電力密度: 280 W/m² (over the area in which the subject was positioned)
ばく露2: 1,840 MHz
Modulation type: pulsed
ばく露時間: not specified
GSM 1800 signal
  • 電界強度: 1 V/m (power received by each subject)
  • 電力密度: 250 W/m² (over the area in which the subject was positioned)
ばく露3: 2,140 MHz
ばく露時間: not specified
UMTS signal
  • 電界強度: 1 V/m (power received by each subject)
  • 電力密度: 380 W/m² (over the area in which the subject was positioned)

ばく露1

主たる特性
周波数 945 MHz
タイプ
  • electromagnetic field
ばく露時間 not specified
Additional information GSM 900 signal
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
Additional information

signal format consisted of eight time slots; each feature consisted of a duration of 546.5 µsec, leading to a total frame duration of 4.372 msec; the guard time between the time slots of 30.5 µsec was inserted into each GSM frame; to simulate the changes in the power level of channels, time slots of 0, 1, 2, and 3 were set to 'on' (transmitted) whereas the time slots of 4, 5, 6, and 7 are chosen to be 'off'
ばく露装置
ばく露の発生源／構造
  • 基地トランシーバ局
  • Kathrein 800 10046
Distance between exposed object and exposure source 2 m
チャンバの詳細 RF shielded room, lined using microwave absorbing sheets; the room was furnished with a wooden table, a flat-screen monitor, a chair and sofa as well as the base station antenna
ばく露装置の詳細 antenna was placed at 1.5 m from the ground floor
Sham exposure A sham exposure was conducted.
パラメータ
測定量 値 種別 Method Mass 備考
電界強度 1 V/m - - - power received by each subject
電力密度 280 W/m² - 測定値 - over the area in which the subject was positioned
Additional parameter details

shielding effectiveness of RF-shielded room was about 48 dB at the tested frequency range; background radiofrequency levels (80 MHz-4 GHz) were measured before and after the tests and the levels were below 1 mV/m over the exposure area

ばく露2

主たる特性
周波数 1,840 MHz
タイプ
  • electromagnetic field
ばく露時間 not specified
Additional information GSM 1800 signal
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
Additional information

signal format consisted of eight time slots; each feature consisted of a duration of 546.5 µsec, leading to a total frame duration of 4.372 msec; the guard time between the time slots of 30.5 µsec was inserted into each GSM frame; to simulate the changes in the power level of channels, time slots of 0, 1, 2, and 3 were set to 'on' (transmitted) whereas the time slots of 4, 5, 6, and 7 are chosen to be 'off'
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 値 種別 Method Mass 備考
電界強度 1 V/m - - - power received by each subject
電力密度 250 W/m² - 測定値 - over the area in which the subject was positioned

ばく露3

主たる特性
周波数 2,140 MHz
タイプ
  • electromagnetic field
ばく露時間 not specified
Additional information UMTS signal
Modulation
Modulation type cf. additional information
Additional information

chip rate 3.84 microchips/sec
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 値 種別 Method Mass 備考
電界強度 1 V/m - - - power received by each subject
電力密度 380 W/m² - 測定値 - over the area in which the subject was positioned

Reference articles

  • Augner C et al. (2010): [唾液中のコルチゾール、αアミラーゼ、および免疫グロブリンAに対するGSM携帯電話基地局信号へのばく露の影響]
  • Eltiti S et al. (2007): [携帯電話基地局シグナルへの短期ばく露によって、電磁過敏症者の症状は増すか？二重ブラインド無作為化誘発研究]
  • Regel SJ et al. (2006): [UMTS基地局様ばく露、健康ならびに認知機能]
  • Haarala C et al. (2004): [902 MHz携帯電話はヒトの短期記憶に影響しない]
  • Haarala C et al. (2003): [ヒトの認知機能への携帯電話902 MHz電磁界の影響：再実験]

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:
  • ばく露前
  • ばく露中
  • ばく露後

研究の主なアウトカム（著者による）

Non-electrosensitive subjects showed a significantly lower heart rate during post-exposure compared to pre-exposure under GSM 900 and GSM 1800 conditions. Under UMTS exposure conditions, both groups, non-electrosensitive and electrosensitive subjects, showed a significant reduction in heart rate during post-exposure compared to pre-exposure.

研究の種別:

研究助成

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