Wilen J, Johansson A, Kalezic N, Lyskov E, et al. (2006)

Twenty subjects were tested who had symptoms specifically related to mobile phone use. They did not complain of general electrical hypersensitivity. The subjects were matched to controls with respect to age, gender, and occupation. Each subject and control participated in two experimental sessions, one with RFR exposure for 30 minutes, and the other with sham-exposure. The order of the sessions was randomized. A GSM 900 test signal was used from an antenna 8.5 cms from the head. The maximum SAR was 0.8 W/kg in 10 g of tissue. A variety of physiological and cognitive parameters were measured. A critical flicker fusion threshold (CFFT) test and a memory test were performed before the RF/sham exposure, and again after the exposure. The subjects were blinded to the exposure condition. The experimenter was not blinded, but no cues were available to the participant.

No significant differences related to RF exposure were detected. Also, no differences in baseline data were found between the cases and controls, except for the reaction time, which was longer in the cases the first time the test was done. This difference disappeared when the test was repeated. The cases displayed a difference in heart rate variability during the CFFT and memory tests. The authors considered that this might be due to differences in the autonomic nervous system regulation between persons with MP related subjective symptoms and persons with no such symptoms.

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