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

[携帯電話信号を感じる人はいるか? 参加者内での二重ブラインド無作為化誘発研究] med./bio.

Are some people sensitive to mobile phone signals? Within participants double blind randomised provocation study.

掲載誌: BMJ 2006; 332 (7546): 886-891

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研究目的(著者による)

To study whether people who report being sensitive to mobile phone signals have more symptoms when exposed to a pulsing mobile phone signal than when exposed to a sham signal or a non-pulsing signal.

詳細情報

60 "sensitive" subjects participated who reported often getting headache-like symptoms within 20 minutes of using a GSM mobile phone and 60 "control" participants who did not report any such symptoms. Participants completed visual analogue scale measures after 5, 15, 30, and 50 minutes of exposure and 30 min after the end of each exposure.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 900 MHz
Modulation type: pulsed
ばく露時間: continuous for 50 min
  • SAR: 1.4 W/kg unspecified (±30%)
ばく露2: 900 MHz
Modulation type: CW
ばく露時間: continuous for 50 min
  • SAR: 1.4 W/kg unspecified (±30%)

ばく露1

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 50 min
Modulation
Modulation type pulsed
Additional information

GSM

ばく露装置
ばく露の発生源/構造
  • セルラ-電話
チャンバの詳細 Both testing rooms, which were lit by two table lamps, were not shielded against outside EMF.
ばく露装置の詳細 A headband mounted standard GSM handset system was used for exposures with the antenna positioned slightly above and behind the left ear and within a few millimetres of the participant's scalp.
Sham exposure A sham exposure was conducted.
Additional information For sham exposure, a CW signal was generated to ensure that the system heated up to the same degree as during the active exposures but was diverted to an internal load instead of being transmitted through the antenna; only minimal leakage of this signal occurred.
パラメータ
測定量 種別 Method Mass 備考
SAR 1.4 W/kg unspecified 校正 - ±30%

ばく露2

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 50 min
Modulation
Modulation type CW
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 1.4 W/kg unspecified 校正 - ±30%

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)

The data did not indicate that people with self reported sensitivity to mobile phone signals are able to detect such signals or that they react to them with increased symptom severity. As sham exposure was sufficient to trigger severe symptoms in some subjects, psychological factors may have an important role in causing this condition.

研究の種別:

研究助成

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