Cellular Phone
EMFs Raise Blood Pressure
Our Toxic Times
March, 2000
Medical study
excerpt in Our Toxic Times, March 2000, page 9. Originally published by the
British Medical Journal, Lancet, 351: 1857-1858, 1998)
The use of cellular phones continues to increase dramatically, prompting some
concerns about possible health-effects.
A single-blind placebo-controlled study conducted on seven healthy men and three
women volunteers aged between 26 and 36 years continuously measured blood
pressure, heart rate, capillary perfusion, as well as subjective well-being in
relation to mobile telephone electromagnetic fields (EMFs) (GSM 900 MHz, 2 watt,
217 Hz frame repetition rate).
The study subjects were unaware of when they were being exposed because the
telephone was fixed in a typical position on the right-hand side of the head and
operated by remote control with no sound.
The exposure protocol involved phases with placebo and with EMF exposure of 35
minutes each with a fixed sequence to allow for effects that might persist after
exposure.
The researchers found that even though the people subjectively noticed no
differences in well-being, their resting blood pressure increased during
exposure to the EMF: "We conclude that exposure of the right hemisphere to
a radiofrequency EMF for 35 minutes causes an increase in sympathetic efferent
activity with increases in resting blood pressure between 5 and 10 mm Hg, most
likely due to more pronounced vasoconstriction."
[Braune, S., et al. "Resting Blood Pressure Increase During Exposure to
Radio-Frequency Electromagnetic Field," Lancet 351: 1857-1858, 1998.]
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