Sleep EEG changes: Effects of pulsed magnetic fields compared with pulse-modulated radiofrequency electromagnetic fields.
Interpretation of the study in the WIKNewsletter 85/2012: "Changes in brain waves of sleep EEG of subjects, before going to the cellular signals (900 MHz, SAR = 2 W / kg spatial average in the head) were exposed, have demonstrated the research group led by Peter Achermann of the University of Zurich and other research groups in several trials already (Comp. WIK EMF Spectrum 2/2010).
In a recent double-blind study of 25 healthy young men has been studied in Achermann's laboratory, which portions of the low-frequency pulse modulation of the high frequency signal (the 2 Hz frequency component, or the higher-frequency harmonics >20 Hz) decisive for the occurrence of the effect are. In addition, we investigated using a magnetic 2 Hz alternating field (magnetic flux density: 0,7 Millitesla [mT] Peak, 0,176 Uniformity mT. / Timel. Average; German radiation protection limit: 0,1 mT), whether the high-frequency electric fields in nonlinear structures by brain, such as e.g.. Cell membranes of nerve cells, can be demodulated (d.h. can be "filtered out" the low frequency signal components) und sich der beobachtete Effekt durch Niederfrequenz -Wirkung erklären ließe.
Subjects were over for three weeks once a week for each 30 Minutes exposed in the sleep laboratory under three different conditions: 2 Hz pulse modulated RF field, 2 Hz pulsed magnetic field and sham exposure. Zusätzlich wurden während der Exposition mentale Leistungstests durchgeführt.
The tests showed, that both the pulse-modulated high-frequency- as well as the 2 Hz magnetic field had the expected effect on the brain activity (increased number of so-called "sleep spindles" in the EEG). Besides, the activity of the other brain waves in different stages of sleep affects. Influences on the sleep pattern and the mental power or by. during exposure could not be determined. According to the authors, the results show, that modulation frequencies above 20 Hz for the occurrence of the effects are not critical. "Since the reactions are not the same for all exposures were, The study does not support the hypothesis, that the effects of high-frequency exposure based only on the demodulation of the signal ", the researchers continue. "
Study in emf portal under: http://www.emf-portal.de/viewer.php?l = g&aid=20939