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To study whether exposure to the emissions from a digital mobile phone prior to sleep alters the secretion of melatonin in 55 volunteers.
|ばく露時間||continuous for 30 min|
|チャンバの詳細||Participants were instructed to sit and look at a white screen. Since the laboratory was an extremely quiet environment (purpose-built for sleep studies), a white noise signal was created by turning on the TV receiver tuned to an unused channel in order to mask any residual sound from the handset.|
|ばく露装置の詳細||A modified digital mobile phone transmitting in 'test mode' was controlled by a laptop computer via a data cable, which was disconnected after the output was set. The mobile phone was attached to a plastic arm mounted on a modified non-metallic welding helmet, and it rested against the subject's right cheek. The phone's loudspeaker circuit was disabled, and wads of plastic foam were placed in the pouch to absorb and eliminate aural cues from the buzzing of circuitry.|
|Additional information||Volunteers were actively or sham exposed in a double-blind cross-over design in random order on successive Sunday nights, immediately prior to retiring to bed, and also prior to the attachment of recording electrodes and other sensors.|
The total overnight melatonin secretion was unaffected by exposure to emissions from a mobile phone for 30 min in the period just prior to sleep. A significant reduction in 6-sulphatoxymelatonin relative to creatinine concentrations in pre-bedtime samples requires indipendent verification.