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To study whether exposure to radiofrequency electromagnetic fields from mobile phones would result in more headache or discomfort than sham exposure and to test possible effects on physiological parameters such as heart rate and blood pressure.
17 eligible individuals, who experienced symptoms (symptoms to mobile phones, but not to electromagnetic fields in general) in a provocation test, took part in the study.
Seventeen subjects took part in a double-blind, randomized provocation study with cross-over design. Sixty-five pairs of sham and mobile phone RF exposures were applied. Each subject was allowed to take part in a maximum of four randomized pairs of trials, at least 2 days apart, among which, the RF session came first twice. A test session lasted almost 2 h, allowing for an adaptation and rest period.
|ばく露時間||continuous for 30 min|
|Duty cycle||12.5 %|
|Repetition frequency||217 Hz|
|Distance between exposed object and exposure source||8.5 cm|
|チャンバの詳細||The exposure system was the same as in [Wilen et al., 2006]. The exposure equipment, except for the antennas, was placed in a control room next to the shielded exposure room. The subjects were comfortably seated while looking at videos showing nature and wildlife films.|
|ばく露装置の詳細||Two wall-mounted base station antennas [Huber et al., 2003] were mounted symmetrically at 8.5 cm from the sides of the subject's head, the movements of which were restricted sideways by wooden bars.|
|Sham exposure||A sham exposure was conducted.|
|Additional information||A power divider directed a part of the signal to one of the antennas or to an ohmic load (sham exposure) and another part to a power meter. The exposure was given on the subject's preferred side or selected by chance.|