本研究では、無線周波数電磁界が脳生理学に及ぼす影響を調査した。24人の健康な若い男性が、パルス変調または連続波の無線周波数電磁界(900MHz;比吸収率ピーク値1W/kg)、または擬似ばく露に30分ばく露した。ばく露中、被験者は認知タスクを行った。覚醒時脳波が、ベースライン、ばく露直後、ばく露30分後、ばく露60分後に記録された。パルス変調無線周波数電磁界ばく露の場合、作業記憶タスクの反応速度が低下し、正確性が上昇した。また、ばく露後30分での、10.5-11Hz範囲の覚醒時脳波スペクトルパワーが上昇した。連続波無線周波数電磁界では影響は見られなかった。これらの結果によって、パルス無線周波数電磁界の非熱的生体影響のさらなる証拠が提供された。
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To study the effects of radiofrequency electromagnetic fields on brain physiology. The effects of a pulse modulation and a continuous wave radiofrequency exposure on cognitive performance and the waking EEG were compared.
During exposure (pulse modulation, continuous wave, or sham exposure), 24 participants performed cognitive tasks. EEG was recorded during baseline (before exposure), immediately after, and 30 and 60 min after exposure.
Three experimental conditions (PW, CW, and sham) were applied at weekly intervals in a double-blind, randomized, counterbalanced crossover design.
周波数 | 900 MHz |
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タイプ |
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ばく露時間 | continuous for 30 min |
ばく露の発生源/構造 |
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Distance between exposed object and exposure source | 115 mm |
ばく露装置の詳細 | The subject's head was positioned between two planar patch antennas and was exposed unilaterally on the left hemisphere. The center of the antenna was located 42 mm vertically above the ear canal at a distance of 115 mm from the head [Huber et al., 2003]. |
Sham exposure | A sham exposure was conducted. |
測定量 | 値 | 種別 | Method | Mass | 備考 |
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SAR | 1 W/kg | peak | - | 10 g | spatial peak |
周波数 | 900 MHz |
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タイプ |
|
ばく露時間 | continuous for 30 min |
Modulation type | CW |
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ばく露の発生源/構造 |
|
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測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
SAR | 1 W/kg | peak | - | 10 g | spatial peak |
Pulse modulated radiofrequency exposure reduced reaction speed and increased accuracy in a working memory task. It also increased spectral power in the EEG in the 10.5-11 Hz range (alpha wave activity) 30 min after exposure.
No effects were found for continuous wave radiofrequency exposure.
These data provide further evidence for a nonthermal biological effect of pulsed radiofrequency fields. The underlying physiological mechanisms remain unknown. Thus, the effects have to be interpreted cautiously, in particular, with respect to possible health consequences.
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