この研究は、ヒトの睡眠構造が、デジタル携帯電話からの無線周電磁界ばく露に反応して変化するか否かを調べた。50人の被験者は、睡眠の前に、30分間の電磁界ばく露を受けた。その結果、ばく露後の睡眠の初期において、レム睡眠の潜時の減少および周波数範囲11.5-12.25 Hzでの脳電図スペクトルパワーの増加が見られた;この知見は、睡眠前の携帯電話へのばく露が、レム睡眠を促進し、最初のノンレム睡眠期間の睡眠脳電図を変化させるかもしれないことを示している、と報告している。
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To test the effects of mobile phone radiofrequency electromagnetic field on human sleep patterns.
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.
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
|
|
周波数 | 894.6 MHz |
---|---|
タイプ |
|
ばく露時間 | continuous for 30 min |
Modulation type | pulsed |
---|---|
Pulse width | 576 µs |
Duty cycle | 12.5 % |
Repetition frequency | 217 Hz |
Additional information |
The 26th frame was not idle. |
ばく露の発生源/構造 |
|
---|---|
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. |
測定量 | 値 | 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 |
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.
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