この研究は、ヒトの認知機能と症状に対するUMTS基地局から放射される無線周波電磁界のばく露の急性影響をボランティア実験で調べた。40人の若年者(15-16才)および40人の成人(25-40才)は、1) 擬似ばく露群、2) 2140MHzの連続波へのばく露群、3) UMTS信号を模擬した変調2140MHzばく露群、4) 2140MHzUMTS信号ばく露群の4つの条件のばく露(各45分間)を、無作為、二重ブラインド、クロスオーバデザインで与えられ、ばく露の間に、トレイルマーキングB(TMB)など数種の認知タスクと主観的症状調査票への回答を行った。その結果、UMTS群と擬似ばく露群の間にTMB成績の有意差はなかった;その他の認知タスクのどれでも有意な変化は見られなかった;若年と成人のデータを統合した場合、頭痛の評点の上昇が観察された、などを報告している。
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This study was designed to investigate the acute effects of radio frequency electromagnetic fields emitted by UMTS mobile phone base stations on human cognitive function and symptoms in vivo.
Adolescents (mean age: 15.7 years; 17 males, 23 females) and adults (mean age: 31.1 years; 24 males, 16 females), neurologically healthy were selected for this study. During exposure the participants performed different cognitive tasks (amongst others "Trail Making B" test) and completed a questionnaire measuring self reported subjective symptoms. In the applied "Trail Making B" test the participants had to draw lines alternating beween numbers and letters in consecutive order. The time at which the task was completed correctly was measured.
ばく露 | パラメータ |
---|---|
ばく露1:
2,140 MHz
Modulation type:
CW
ばく露時間:
continuous for 45 min
|
|
ばく露2:
2,140 MHz
ばく露時間:
continuous for 45 min
|
All participants attended four exposure sessions on separate days at the same time of day. They were exposed to four conditions: sham, CW, a signal modulated as UMTS, and UMTS including all control features in a randomized, double blinded cross-over design.
周波数 | 2,140 MHz |
---|---|
タイプ |
|
偏波 |
|
ばく露時間 | continuous for 45 min |
Additional information | plane wave with vertical polarization |
Modulation type | CW |
---|
ばく露の発生源/構造 |
|
---|---|
Distance between exposed object and exposure source | 2.8 m |
チャンバの詳細 | The study was performed under controlled conditions in a shielded 33.4 m³ climate chamber made of aluminium with walls, floor, and ceiling partly covered with RF absorbers. All cables to and from the chamber were filtered and mounted with ferrite beads to suppress common mode signals. All lighting in the room was from light-fibres or from a 12 V DC source, and all electronic devices were supplied by 12 V DC. |
ばく露装置の詳細 | The participants were seated on a chair at a wooden table next to a computer and keyboard. |
Sham exposure | A sham exposure was conducted. |
周波数 | 2,140 MHz |
---|---|
タイプ |
|
偏波 |
|
ばく露時間 | continuous for 45 min |
Additional information | plane wave with vertical polarization |
ばく露の発生源/構造 |
|
---|---|
Distance between exposed object and exposure source | 2.8 m |
Additional information | The CW modulated as UMTS was generated by setting the control channels to the lowest level (P-SCH, S-SCH, P-CCPCH, and the PICH channel). The UMTS signal was generated by initiating a live connection to a mobile phone through a 10 dB coupler and then filtering only the base station signal to the exposure antenna. |
No statistically significant differences between the UMTS and sham exposure were found in any of the cognitive tests or self reported symptoms in both adolescents and adults.
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