To establish a dose-response relationship between the field strength of electromagnetic fields and previously reported effects (see "Related articles") on the brain, the authors aimed to investigate the influence of electromagnetic field exposure by varying the signal intensity (0.2 W/kg; 5 W/kg; sham exposure).
The heads of 15 healthy male subjects was unilaterally exposed for 30 min prior to sleep. During exposure subjects performed cognitive tasks. Immediately after exposure, night-time sleep was polysomnographically recorded for 8 h.
|continuous for 30 min
Sleep architecture was not affected by electromagnetic field exposure. The sleep EEG revealed a dose-dependent increase of power in the spindle frequency range in non-REM sleep.
Reaction speed decreased with increasing field strength in the 1-back task, while accuracy in the 2-choice reaction time task and N-back task were not affected in a dose-dependent manner.
In conclusion, the data revealed first indications of a dose-response relationship between electromagnetic field intensity and its effects on brain physiology.