A German study indicates the electromagnetic fields emitted by mobile telephones cause an increase in blood pressure.
Dr. Stephan Braune of the University Neurology Clinic in Freiburg, Germany, strapped a mobile phone to the heads of 10 volunteers between the ages of 26 and 36. The phones were switched on by remote control at various intervals such that the volunteers were not aware when they were being exposed to the electromagnetic fields.
Researchers measured blood pressures while the volunteers were lying down and standing up.
The researchers recorded increases of 5 mm to 10 mm Hg in blood pressure while volunteers were resting and exposed to the switched-on mobile phone. The increase in blood pressure probably resulted from constriction of the arteries caused by the radio-frequency EMF, said the researchers.
The report was published Friday in the Lancet medical journal.
