この研究は、携帯電話のパルス高周波電磁界によるヒトの生理学的システムへの影響を調べる３つのボランティア実験を連続して実施した。いずれの実験も、健康な男性被験者を対象に、パルス高周波電磁界に終夜ばく露中の睡眠ポリグラフ測定を行い、睡眠パラメータ変化およびスペクトルパワーを分析した。第１実験の主な結果は、電磁界ばく露による顕著な催眠効果およびREM抑制効果であったが、この結果は第2、3の実験では再現されなかった（第3実験では、パイロット実験での電力密度を大きく上回るレベルを用いていたが）。このような結果の相違の解釈として考えられるものは、実験により異なる電磁界の物理的質（偏波のタイプなど）、被験者間の電磁界に対する感受性の個人差、および電磁界と睡眠構築との相互作用が特定の電力密度範囲においてのみ引き起こされるという「窓効果」の存在、などであると考察している。
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This article presents a survey of three consecutive studies (see publication 599, publication 646, and publication 5336) investigating the effects of electromagnetic fields emitted by mobile phones on sleep parameters.
| ばく露 | パラメータ |
|---|---|
|
ばく露1:
900 MHz
Modulation type:
pulsed
ばく露時間:
continuous for 8 h
first study
|
|
|
ばく露2:
900 MHz
Modulation type:
pulsed
ばく露時間:
continuous for 8 h
second study
|
|
|
ばく露3:
900 MHz
Modulation type:
pulsed
ばく露時間:
repeated daily exposure, 8 h/night for 2 nights
third study
|
|
| 周波数 | 900 MHz |
|---|---|
| タイプ |
|
| 偏波 |
|
| ばく露時間 | continuous for 8 h |
| Additional information | first study |
| Modulation type | pulsed |
|---|---|
| Pulse width | 580 µs |
| Repetition frequency | 217 Hz |
| ばく露の発生源／構造 |
|
|---|---|
| Distance between exposed object and exposure source | 40 cm |
| ばく露装置の詳細 | The mobile phone was located 40 cm from the head (vertex) of the subjects lying in bed. |
| Sham exposure | A sham exposure was conducted. |
| Additional information | Following an adaptation night, two polysomnographies were performed with or without EMF for half of the subjects in double-blind order. |
| 周波数 | 900 MHz |
|---|---|
| タイプ |
|
| 偏波 |
|
| ばく露時間 | continuous for 8 h |
| Additional information | second study |
| Modulation type | pulsed |
|---|---|
| Repetition frequency | 217 Hz |
| ばく露の発生源／構造 |
|
|---|---|
| チャンバの詳細 | Sleeping chamber constructed of absorbing material |
| Sham exposure | A sham exposure was conducted. |
| Additional information | double-blind study |
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| 電力密度 | 0.2 W/m² | unspecified | 測定値 | - | - |
| 周波数 | 900 MHz |
|---|---|
| タイプ |
|
| 偏波 |
|
| ばく露時間 | repeated daily exposure, 8 h/night for 2 nights |
| Additional information | third study |
| Modulation type | pulsed |
|---|---|
| Repetition frequency | 217 Hz |
| ばく露の発生源／構造 |
|
|---|---|
| チャンバの詳細 | Sleeping chamber constructed of absorbing material |
| Sham exposure | A sham exposure was conducted. |
| Additional information | Subjects spent 2 sessions, at least 7 days apart, of 3 consecutive nights in the sleep laboratory: one session consisted of an adaptation night and 2 consecutive nights for the recording of the polysomnographies. Half of the subjects were exposed to EMF in the first or the second session (blinded). |
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| 電力密度 | 50 W/m² | unspecified | 指定なし | - | - |
A pronounced hypnotic and REM sleep-suppressive effect of the field was the main finding of the first study (publication 599), but it could not be replicated by the following ones, even though the power flux density applied in the third study (publication 5336) exceeded by far that of the pilot study.
Potential explanations are differences in physical qualities of the fields applied in the different investigations (like the type of polarization), interindividual differences in sensitivity to electromagnetic fields among the subjects under study, and the existence of 'window effects', where interactions with sleep architecture only occur in special ranges of power flux densities.
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