In order to simulate real-life exposure conditions and sleep habits, the present study exposed subjects to pulsed high-frequency electromagnetic field emitted by an actual mobile phone (with continuous transmission and constant power output, prior to a full night-time sleep episode).
Additionally, the authors attempted to replicate previous studies (see publication 9345 and publication 9849) and test the hypotheses that the 11.5-12.25, 12.25-13.5, and 13.5-14 Hz frequency bands would be enhanced following radiofrequency electromagnetic field exposure.
|Exposure duration||continuous for 30 min|
|Pulse width||576 µs|
|Duty cycle||12.5 %|
|Repetition frequency||217 Hz|
The 26th frame was not idle.
|Setup||Participants sat comfortably in chairs with a mobile phone mounted in a cradle on the right side of the head in a normal use position with the antenna situated over the right temporal region. The GSM digital mobile phone was set to continuously transmit at constant power, using a link to a laptop computer.|
|Additional info||The audio circuits of the phone were disconnected and padding was placed between the handset and its cover to prevent acoustic or thermal cues. Additionally, a white noise signal was used in the background in order to mask any residual sound from the handset's operation. Participants attended two sessions one week apart and were subject to randomized EMF or sham exposure using a double-blind crossover design.|
|SAR||0.11 W/kg||average over mass||measured||10 g||peak value of 0.29 W/kg|
The data revealed a decrease in REM sleep latency and increased electroencephalogram spectral power in the 11.5-12.25 Hz frequency band range during the initial part of sleep following exposure. These findings are evidence that mobile phone exposure prior to sleep may promote REM sleep and modify the sleep electroencephalogram in the first non-REM sleep period. No conclusions can be made regarding adverse health consequences as the mechanisms of the effects are still unknown.