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The aim of this study was to estimate the influence of the call with a mobile phone on heart rate variability in young healthy people.
32 healthy students (18 women and 14 men) with normal electrocardiogram and echocardiogram at rest participated. ECG recordings were performed on sitting subject in a semi-darkened, quiet room between 8:00 and 9:00 in the morning.
Modulation type: pulsed
ばく露時間: continuous for 20 min
|ばく露時間||continuous for 20 min|
|チャンバの詳細||semi-darkened, temperature-controlled quiet laboratory at room temperature (21°C)|
|ばく露装置の詳細||The GSM mobile phone was held in the right hand during the call. It was switched on during the whole time of the experiment so that the effect of logging into the mobile phone network on the maximal emission of EMF could be avoided.|
|Additional information||Recordings were made over three 20 min periods, i.e., before, during, and after the telephone call.|
|SAR||0.48 W/kg||maximum||測定値||10 g||tested by the manufacturer|
There were no statistically significant changes in mean, maximal and minimal heart rate neither in men nor in women. Time domain analysis parameters such as "standard deviation of all normal sinus RR intervals" and "standard deviation of the averaged normal sinus RR intervals for all 5-mm segments" were significantly increased during mobile phone exposure. Frequency domain analysis revealed statistically significant increase in very low frequency and low frequency power in women and in high frequency power in both genders. Statistically significant decreased low frequency/high frequency ratio was observed in exposed women.
These results suggest that the parasympathetic tone was increased while sympathetic tone was lowered during mobile phone exposure. The authors conclude that the observed changes in heart rate variability could be affected by electromagnetic field but the influence of speaking cannot be excluded.