From a total of 251 healthy volunteers recruited from the hospital staff, 148 subjects (85 women and 63 men) were included in the study. The inclusion criteria were age >18 years, an interference-free 24-h ECG and the volunteer's consent. Subjects were divided into 4 groups according to the duration of mobile phone use: 1) < 30 minutes/day (n=37), 2) 30 - 60 minutes/day (n=37), 3) > 60 minutes/day (n=39), 4) no mobile phone use (control group; n=35). All participants (except for the control group) had been using mobile phones for > 10 years prior to the study.
No parameters are specified for this exposure.
After adjustment for age, sex and BMI, only the LF/HF ratio of heart rate variability was significantly increased in the exposure groups (groups 1-3) compared to the control group (remark EMF-Portal: for other parameters, significance after statistical adjustment was not mentioned).
The authors conclude that long-term mobile phone use might influence the heart rate variability.