To measure heart rate and blood pressure during and after a 35 min radiofrequency exposure for the two European cellular phone operational frequencies (900 and 1800 MHz).
Subjects attended two sessions, 1 week apart, each lasting 2 h, with 35-min RF and sham exposure to either 900 or 1800 MHz cellular phones, in double randomized, double blind, crossover design.
| Frequency | 900 MHz |
|---|---|
| Type | |
| Exposure duration | continuous for 35 min |
| Modulation type | pulsed |
|---|
| Exposure source | |
|---|---|
| Chamber | The experiments were carried out in a quiet laboratory with a well-regulated temperature (21-23°C) and relative humidity (35-45%). |
| Setup | A PC-controlled, dual band mobile phone and an identical but inactive phone were located on a plastic head helmet. The active phone was leaning to the ear on the dominant hand side of the head and the inactive phone was leaning to the ear on the non-dominant hand side. |
The findings of this randomized, double-blind study, placebo controlled crossover study indicate that exposure to a cellular phone, using 900 MHz or 1800 MHz (compared to sham exposure) with maximal allowed antenna powers, does not acutely change arterial blood pressure and heart rate, during or after the 35 min exposure. There were no differences in the subjective symptoms reported by the subjects between exposure and sham exposure.
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