Comment; The effect on the parasympathetic system with a decrease in heart rate variability but no change in respiratory rate was noted. Subjects were unable to differentiate between real and sham exposure symptomatically. The frequency of this signal was chosen because it is close to and does not disturb Digital Cellular System (DCS-1800) prepaid uplink bandwidth, which is set at the 1710.1–1776. 1MHz band by the regulatory authority for electronic communications and postal services of the Slovak Republic for Slovak mobile network providers [TELEOFF]. The frequency selected seems to be more of “convenience” not affecting cellar services. I would have preferred a cellular frequency protocol done inside a faraday cage to give more “real world” information.
Authors; Jakub Misek,1 * Igor Belyaev,2,3 Viera Jakusova,4 Ingrid Tonhajzerova,5,6 Jan Barabas,7 and Jan Jakus1 1 Jessenius Faculty of Medicine inMartin, Department of MedicalBiophysics, Comenius Universityin Bratislava, Martin, Slovakia 2 Laboratory of Radiobiology, Slovak Academy of Science, BiomedicalResearch Center, Cancer ResearchInstitute, Bratislava, Slovakia 3 Laboratory of Radiobiology, RussianAcademy of Science, Prokhorov General Physics Institute, Moscow, Russia 4 Jessenius Faculty of Medicine inMartin, Department of Public Health, Comenius Universityin Bratislava, Martin, Slovakia 5 Jessenius Faculty of Medicine inMartin, Department of Physiology, Comenius Universityin Bratislava, Martin, Slovakia 6 Jessenius Faculty of Medicine inMartin, Biomedical CenterMartin, Comenius Universityin Bratislava, Martin, Slovakia 7 University of Zilina, University Science Park, Zilina, Slovakia
This study examines the possible effect of radiofrequency (RF) electromagnetic fields (EMF) on the autonomic nervous system (ANS). The effect of RF EMF on ANS activity was studied by measuring heart rate variability (HRV) during ortho-clinostatic test (i.e., transition from lying to standing and back) in 46 healthy grammar school students. A 1788MHz pulsed wave with intensity of 54 1.6 V/m was applied intermittently for 18 min in each trial. Maximum specific absorption rate (SAR10) value was determined to 0.405W/kg. We also measured the respiration rate and estimated a subjective perception of EMF exposure. RF exposure decreased heart rate of subjects in a lying position, while no such change was seen in standing students. After exposure while lying, a rise in high frequency band of HRV and root Mean Square of the Successive Differences was observed, which indicated an increase in parasympathetic nerve activity. Tympanic temperature and skin temperature were measured showing no heating under RF exposure. No RF effect on respiration rate was observed. None of the tested subjects were able to distinguish real exposure from sham exposure when queried at the end of the trial. In conclusion, short-term RF EMF exposure of students in a lying position during the orthoclinostatic test affected ANS with significant increase in parasympathetic nerve activity compared to sham exposed group. Bioelectromagnetics. © 2018 Wiley Periodicals, Inc.