Browsing by Author "Wilén, Jonna"
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- ItemNo effect of mobile phone-like RF exposure on patients with atopic dermatitis.(2008-06-11) Johansson, Amanda; Forsgren, Sture; Stenberg, Berndt; Wilén, Jonna; Kalezic, Nebojsa; Sandström, MonicaThis study investigates the effect of exposure to a mobile phone like radiofrequency RF electromagnetic field on people with atopic dermatitis AD Fifteen subjects with AD were recruited and matched with 15 controls without AD The subjects were exposed for 30 min to an RF field at 1 W kg via an indoor base station antenna attached to a 900 MHz GSM mobile phone Blood samples for ELISA analysis of the concentration of substance P SP tumor necrosis factor receptor 1 TNF R1 and brain derived neurotrophic factor BDNF in serum were drawn before and after the provocation exposure sham Baseline heart rate and heart rate variability local blood flow and electrodermal activity were also recorded No significant differences between the subject groups were found for baseline neurophysiological data The cases displayed a serum concentration of TNF R1 significantly higher than the control subjects and a significantly lower serum concentration of BDNF in the baseline condition For SP there was no difference between groups However no effects related to RF exposure condition were encountered for any of the measured substances As to symptoms a possible correlation with exposure could not be evaluated due to too few symptom reports The result of the study does not support the hypothesis of an effect of mobile phone like RF exposure on serum levels of SP TNF R1 and BDNF in persons with AD
- ItemPsychophysiological tests and provocation of subjects with mobile phone related symptoms.(2006-03-22) Wilén, Jonna; Johansson, Amanda; Kalezic, Nebojsa; Lyskov, Eugene; Sandström, MonicaThe aim of the present study was to investigate the effect of exposure to a mobile phone like radiofrequency RF electromagnetic field on persons experiencing subjective symptoms when using mobile phones MP Twenty subjects with MP related symptoms were recruited and matched with 20 controls without MP related symptoms Each subject participated in two experimental sessions one with true exposure and one with sham exposure in random order In the true exposure condition the test subjects were exposed for 30 min to an RF field generating a maximum SAR 1g in the head of 1 W kg through an indoor base station antenna attached to a 900 MHz GSM MP The following physiological and cognitive parameters were measured during the experiment heart rate and heart rate variability HRV respiration local blood flow electrodermal activity critical flicker fusion threshold CFFT short term memory and reaction time No significant differences related to RF exposure conditions were detected Also no differences in baseline data were found between subject groups except for the reaction time which was significantly longer among the cases than among the controls the first time the test was performed This difference disappeared when the test was repeated However the cases differed significantly from the controls with respect to HRV as measured in the frequency domain The cases displayed a shift in low high frequency ratio towards a sympathetic dominance in the autonomous nervous system during the CFFT and memory tests regardless of exposure condition This might be interpreted as a sign of differences in the autonomous nervous system regulation between persons with MP related subjective symptoms and persons with no such symptoms
- ItemSubjective symptoms among mobile phone users--a consequence of absorption of radiofrequency fields?(2003-04-01) Wilén, Jonna; Sandström, Monica; Hansson Mild, KjellIn a previous epidemiological study where we studied the prevalence of subjective symptoms among mobile phone MP users we found as an interesting side finding that the prevalence of many of the subjective symptoms increased with increasing calling time and number of calls per day In this extrapolative study we have selected 2402 people from the epidemiological study who used any of the four most common GSM MP We used the information about the prevalence of symptoms calling time per day and number of calls per day and combined it with measurements of the Specific Absorption Rate SAR We defined three volumes in the head and measured the maximum SAR averaged over a cube of 1 g tissue SAR 1g in each volume Two new exposure parameters Specific Absorption per Day SAD and Specific Absorption per Call SAC have been devised and are obtained as combinations of SAR calling time per day and number of calls per day respectively The results indicates that SAR values 0 5 W kg may be an important factor for the prevalence of some of the symptoms especially in combination with long calling times per day