この研究は、携帯電話電磁界（EMF）によって誘発される潜在的な脳電図（EEG）変化について誘発試験するにあたり、GSM 1800規格に従って、変調周波数および電界強度を厳密に制御した。18人の健康な被験者を対象に、二重ブラインド化プラセボ対照試験を実施した。試験に用いたEMFは、パルス変調周波数が217、108、27、または0 Hz（すなわち、CW）であり、GSM携帯電話のピーク出力1 / 4、1、2、および8 Wで放射されるEMFとした。対応する比吸収率（SAR（10g））は、それぞれ約0.61 W / kgまたは1.25 W / kgであった。その結果、4分間のばく露中において、EEGのスペクトル成分の観点からのEEGの即応性の変化は検出されなかった、と報告している。
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To study the influence of modulation and field strength of electromagnetic fields according to the GSM 1800 standard on short-term EEG alterations.
27 healthy subjects were studied. For each of them five short EEG epochs (each four minutes; 3.5 minutes break in between) were recorded under exposure. Due to artefacts or vigilance fluctuations, only data from 18 subjects (11 female) were evaluated.
| ばく露 | パラメータ |
|---|---|
|
ばく露1:
1,800 MHz
Modulation type:
CW
ばく露時間:
intermittent, 4 min on/3.5 min off, for each condition
|
|
|
ばく露2:
1,800 MHz
Modulation type:
pulsed
ばく露時間:
intermittent, 4 min on/3.5 min off, for each condition
|
|
|
ばく露3:
1,800 MHz
Modulation type:
pulsed
ばく露時間:
intermittent, 4 min on/3.5 min off, for each condition
|
|
|
ばく露4:
1,800 MHz
Modulation type:
pulsed
ばく露時間:
intermittent, 4 min on/3.5 min off, for each condition
|
|
|
ばく露5:
1,800 MHz
Modulation type:
pulsed
ばく露時間:
intermittent, 4 min on/3.5 min off, for each condition
|
Following a 6-min adaptation period, EEG recordings of 4 min were made for each of six exposure conditions, including sham, that were separated by breaks of 3.5 min. The sequence of conditions was randomised over subjects in double blind mode.
| 周波数 | 1,800 MHz |
|---|---|
| タイプ |
|
| ばく露時間 | intermittent, 4 min on/3.5 min off, for each condition |
| Modulation type | CW |
|---|
| ばく露の発生源／構造 |
|
|---|---|
| Distance between exposed object and exposure source | 10 mm |
| チャンバの詳細 | EEG recordings were performed in a separate room, the walls of which were coated with RF-absorbing foam elements with an attenuation of at least 20 dB at 1-2 GHz. The bioamplifier was positioned outside this room. |
| ばく露装置の詳細 | Subjects were seated in a wooden desk chair in a relaxed wakefulness with eyes closed. The mobile phone was attached to the frame of the chair and was individually positioned with its antenna close to the subject's ear. |
| Sham exposure | A sham exposure was conducted. |
| Additional information | The orientation and position of the antenna approximately matched the 30° position as specified in the measurement standard drafted by CENELEC, SC211/B, WGMTE (1997). |
| 周波数 | 1,800 MHz |
|---|---|
| タイプ |
|
| ばく露時間 | intermittent, 4 min on/3.5 min off, for each condition |
| Modulation type | pulsed |
|---|---|
| Repetition frequency | 217 Hz |
| ばく露の発生源／構造 |
|
|---|
| 周波数 | 1,800 MHz |
|---|---|
| タイプ |
|
| ばく露時間 | intermittent, 4 min on/3.5 min off, for each condition |
| Modulation type | pulsed |
|---|---|
| Repetition frequency | 217 Hz |
| ばく露の発生源／構造 |
|
|---|
| 周波数 | 1,800 MHz |
|---|---|
| タイプ |
|
| ばく露時間 | intermittent, 4 min on/3.5 min off, for each condition |
| Modulation type | pulsed |
|---|---|
| Repetition frequency | 108 Hz |
| ばく露の発生源／構造 |
|
|---|
| 周波数 | 1,800 MHz |
|---|---|
| タイプ |
|
| ばく露時間 | intermittent, 4 min on/3.5 min off, for each condition |
| Modulation type | pulsed |
|---|---|
| Repetition frequency | 27 Hz |
| ばく露の発生源／構造 |
|
|---|
During the four minute exposures under various modulations and field strengths no short-term alterations of the EEG were observed. None of the subjects experienced any remarkable sensations during exposure.
In this study, no evidence for an athermic biological effect of GSM electromagnetic fields on awake EEG was found.
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