この研究は、自己評価による眠気、および睡眠脳波指標に対する無線周波電磁界ばく露(884MHzのGSM信号規格、10g空間平均SARの時間平均値:1.4W/kg)の影響を二重ブラインド法で実験した。被験者(電磁界に対する過敏性を訴える人23名、訴えない人25名;全体の平均年齢28歳)には、睡眠前に3時間ばく露(午後7時30分~10時30分、ばく露群と擬似ばく露群)を与え、その後、睡眠検査室で終夜睡眠ポリグラフを記録した。その結果、擬似ばく露群に比べばく露後では、第3および4段階の睡眠(徐波睡眠:SWS)が減少し、第2段階睡眠が増加した;ばく露群では第3段階睡眠までの潜時も増加した;脳波のパワースペクトル密度では、第2段階睡眠の最初の30分間における周波数域0.5~1.5および5.75~10.5Hzの活動増加、第2段階睡眠の最初の1時間における周波数域7.5~11.75Hzの活動増加、第2段階睡眠の2時間目の1時間における周波数域4.75~8.25Hzの活動増加が示された;SWSまたは第2段階睡眠の3時間目の1時間においては顕著な変化は見られなかった;事前に調べた電磁界に対する過敏性の訴えはこれらの結果に関連しなかった、と報告している。
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To study the effects of radiofrequency exposure (GSM) on self-evaluated sleepiness and objective EEG measures during sleep in a non-sensitive and a sensitive group (with symptoms in relation to mobile phone use).
48 subjects (mean age 28 years; 27 females, 21 males) were exposed for 3 h (19:30-22:30; active or sham exposure) prior to sleep. The test sessions were separated by at least one week. The mobile phone sensitive group consisted of 23 subjects with GSM mobile phone-related symptoms (15 females) and the non-sensitive group, without such symptoms, consisted of 25 subjects (12 females).
ばく露 | パラメータ |
---|---|
ばく露1:
884 MHz
Modulation type:
AM, pulsed
ばく露時間:
continuous for 3 hr
|
周波数 | 884 MHz |
---|---|
タイプ |
|
ばく露時間 | continuous for 3 hr |
ばく露の発生源/構造 |
|
---|---|
ばく露装置の詳細 | low-weight, stacked, micropatch antenna fixed on a headset, balanced by a counterweight, antenna placed on the left side of the head and a small ceramic plate which was heated to 39° C +/- 0.2° C was fixed to the left ear lobe (to mimic the sensation from a warm phone); test persons placed in a room with RF absorbers on three sides |
Sham exposure | A sham exposure was conducted. |
The data showed that following exposure, time in sleep stages 3 and 4 (so-called "slow-wave sleep", deep sleep phase) decreased by 9.5 minutes (12% out of a total of 78.6 minutes), and time in sleep stage 2 increased by 8.3 minutes (4% out of a total of 196.3 minutes) compared to sham exposure. The latency to sleep stage 3 was also prolonged by 4.8 min after exposure.
Power density spectral analysis of the EEG indicated an enhanced activation in the frequency ranges 0.5-1.5 and 5.75-10.5 Hz (representing parts of delta wave, theta wave and alpha wave frequency bands) during the first 30 min of sleep stage 2. During the full first hour of sleep stage 2 the spectral density increased particularly within the frequency range of 7.5-11.75 Hz. During the second hour of the sleep stage 2 activity was elevated within the frequency range 4.75-8.25 Hz. No pronounced power changes were observed in slow-wave sleep (sleep stages 3+4) or for the third hour of sleep stage 2.
No differences were found between non-sensitive controls and sensitive subjects with prior complaints of mobile phone-related symptoms.
The data confirm previous findings (see "realted articles") that radiofrequency exposure increased the spectral density of the alpha wave range in the sleep EEG, and indicated moderate impairment of slow-wave sleep. Furthermore, reported differences in sensitivity to mobile phone use were not reflected in sleep parameters.
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