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

[携帯電話からの夕方の電磁波ばく露はその後のメラトニン生成に影響するか?] med./bio.

Does evening exposure to mobile phone radiation affect subsequent melatonin production?

掲載誌: Int J Radiat Biol 2006; 82 (2): 69-76

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研究目的(著者による)

To study whether exposure to the emissions from a digital mobile phone prior to sleep alters the secretion of melatonin in 55 volunteers.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 895 MHz
Modulation type: pulsed
ばく露時間: continuous for 30 min
  • 電力: 0.25 W mean
  • SAR: 0.674 W/kg average over mass (10 g)
  • SAR: 0.11 W/kg maximum (cf. remarks)

ばく露1

主たる特性
周波数 895 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 30 min
Modulation
Modulation type pulsed
Duty cycle 12.5 %
Repetition frequency 217 Hz
Additional information

standard GSM signal with no phase modulation nor 26th pulse blanking present

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 Participants were instructed to sit and look at a white screen. Since the laboratory was an extremely quiet environment (purpose-built for sleep studies), a white noise signal was created by turning on the TV receiver tuned to an unused channel in order to mask any residual sound from the handset.
ばく露装置の詳細 A modified digital mobile phone transmitting in 'test mode' was controlled by a laptop computer via a data cable, which was disconnected after the output was set. The mobile phone was attached to a plastic arm mounted on a modified non-metallic welding helmet, and it rested against the subject's right cheek. The phone's loudspeaker circuit was disabled, and wads of plastic foam were placed in the pouch to absorb and eliminate aural cues from the buzzing of circuitry.
Additional information Volunteers were actively or sham exposed in a double-blind cross-over design in random order on successive Sunday nights, immediately prior to retiring to bed, and also prior to the attachment of recording electrodes and other sensors.
パラメータ
測定量 種別 Method Mass 備考
電力 0.25 W mean 測定値 - -
SAR 0.674 W/kg average over mass 測定値 10 g -
SAR 0.11 W/kg maximum 測定値 cf. remarks -

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 total overnight melatonin secretion was unaffected by exposure to emissions from a mobile phone for 30 min in the period just prior to sleep. A significant reduction in 6-sulphatoxymelatonin relative to creatinine concentrations in pre-bedtime samples requires indipendent verification.

研究の種別:

研究助成

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