Phone EMF's Raise Blood Pressure
Our Toxic Times
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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