Are some people sensitive to mobile phone signals? Within participants double blind randomised provocation study

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Abstract

Objective To test whether people who report being sensitive to mobile phone signals have more symptoms when exposed to a pulsing mobile signal than when exposed to a sham signal Of a non-puling signal. Design Double blind, randomised, within participants provocation study. Setting Dedicated suite Of Offices at King's College London, between September 2003 and June 2005. Participants 60 "sensitive" people who reported often getting headache-like symptoms within 20 minutes of using a global system for mobile communication (GSM) mobile phone and 60 "control" participants who did not report any such symptoms. Intervention Participants were exposed to three conditions: a 900 MHz GSM mobile phone signal, a non-pulsing carrier wave signal, and a sham condition with no signal present. Each exposure lasted for 50 minutes. Main outcome measures The principal outcome measure was headache severity assessed with a 0-100 visual analogue scale. Other outcomes included six other subjective symptoms mid participants' ability to judge whether a signal was present. Results Headache severity increased during exposure and decreased immediately afterwards. However, no strong evidence was found of air), difference between the conditions in terms of symptom severity. Nor did evidence of any differential effect of condition between the two groups exist. The proportion of sensitive participants who believed a signal was present (during GSM exposure (60%) was similar to the proportion who believed one was present during sham exposure (63%). Conclusions No evidence Was found to indicate that people with self reported sensitivity to mobile phone signals are able to detect such signals or that they react to them with increased symptom severity. As sham exposure was sufficient to trigger severe symptoms in sonic participants, psychological factors may have an important role in causing this condition.
Original languageEnglish
Pages (from-to)886 - 891
Number of pages6
JournalBMJ, British Medical Journal (Clinical Research Ed.)
Volume332
Issue number7546
DOIs
Publication statusPublished - 15 Apr 2006

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