To study the possible effects of radiofrequency fields emitted by digital mobile phones on cardiac autonomic modulation by short-time heart rate variability analysis.
20 healthy young subjects participated. They were rested in supine position at least for 15 minutes and heart rate variability parameters were recorded at baseline for five minutes. Afterwards, heart rate variability parameters were recorded at mobile phone "turned off mode", at "turned on mode", and at "calling mode" over 5 minutes periods for each stage.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
900–1,800 MHz
Modulation type:
pulsed
Exposure duration:
three times 5 min (see add. information)
|
- |
| Frequency | 900–1,800 MHz |
|---|---|
| Type | |
| Exposure duration | three times 5 min (see add. information) |
| Modulation type | pulsed |
|---|---|
| Repetition frequency | 217 Hz |
| Exposure source | |
|---|---|
| Setup | test person lying on a bed in the test room |
| Additional info | first 5 min: phone turned off; fastened to the test person's belt on the right side second 5 min: phone turned on; touching the left pectoral skin of the test person third 5 min: phone called from another phone in 2 m distance; vibration mode and ringing of the phone turned off; phone in the same position as in the second trial |
No parameters are specified for this exposure.
Neither time domain nor frequency domain analysis of heart rate variability parameters were altered significantly during "off mode", "on mode" or "calling mode" compared with their baseline values. Short-time exposure to electromagnetic fields emitted by a mobile phone did not affect the cardiac autonomic modulation in healthy subjects.
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