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

[携帯電話による電磁界のヒト睡眠への影響] med./bio.

The effect of electromagnetic fields emitted by mobile phones on human sleep.

掲載誌: Neuroreport 2005; 16 (17): 1973-1976

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研究目的(著者による)

To test the effects of mobile phone radiofrequency electromagnetic field on human sleep patterns.

詳細情報

In order to simulate real-life exposure conditions and sleep habits, the present study exposed subjects to pulsed high-frequency electromagnetic field emitted by an actual mobile phone (with continuous transmission and constant power output, prior to a full night-time sleep episode).
Additionally, the authors attempted to replicate previous studies (see publication 9345 and publication 9849) and test the hypotheses that the 11.5-12.25, 12.25-13.5, and 13.5-14 Hz frequency bands would be enhanced following radiofrequency electromagnetic field exposure.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 894.6 MHz
Modulation type: pulsed
ばく露時間: continuous for 30 min
  • SAR: 0.11 W/kg average over mass (10 g) (peak value of 0.29 W/kg)

ばく露1

主たる特性
周波数 894.6 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 30 min
Modulation
Modulation type pulsed
Pulse width 576 µs
Duty cycle 12.5 %
Repetition frequency 217 Hz
Additional information

The 26th frame was not idle.

ばく露装置
ばく露の発生源/構造
  • セルラ-電話
ばく露装置の詳細 Participants sat comfortably in chairs with a mobile phone mounted in a cradle on the right side of the head in a normal use position with the antenna situated over the right temporal region. The GSM digital mobile phone was set to continuously transmit at constant power, using a link to a laptop computer.
Additional information The audio circuits of the phone were disconnected and padding was placed between the handset and its cover to prevent acoustic or thermal cues. Additionally, a white noise signal was used in the background in order to mask any residual sound from the handset's operation. Participants attended two sessions one week apart and were subject to randomized EMF or sham exposure using a double-blind crossover design.
パラメータ
測定量 種別 Method Mass 備考
SAR 0.11 W/kg average over mass 測定値 10 g peak value of 0.29 W/kg

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 revealed a decrease in REM sleep latency and increased electroencephalogram spectral power in the 11.5-12.25 Hz frequency band range during the initial part of sleep following exposure. These findings are evidence that mobile phone exposure prior to sleep may promote REM sleep and modify the sleep electroencephalogram in the first non-REM sleep period. No conclusions can be made regarding adverse health consequences as the mechanisms of the effects are still unknown.

研究の種別:

研究助成

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