Sunday, May 27, 2007

[hindi_jokes] Mobile induced headaches 'all in the mind'

 
Mobile phones do not cause headaches despite claims by some consumers, a scientific study has found. Instead, people experience such symptoms because they expect them to occur.

Dr Gunnhild Oftedal and his team at Norway University in Trondheim recruited 17 subjects who "regularly experienced pain or discomfort in the head during or shortly after mobile phone calls lasting between 15 and 30 minutes."

The participants were tested during mobile phone radiofrequency exposure and sham exposure, without knowing which session was which. Each session lasted 30 minutes, and 65 pairs of trials were conducted.

As reported in the medical journal Cephalalgia, the subjects said they felt an increase in pain or discomfort during 68 per cent of all trials. The degree of symptoms was not associated with the order of trials.

The researchers observed no statistically significant correlations between actual exposures and the subjects' reports of symptom severity, and no effects of exposure on changes in heart rate or blood pressure.

Oftedal's team concludes that the most likely explanation for the headaches and discomfort reported by the subjects "is that the symptoms are due to negative expectations."


 

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posted by Raghubar at 10:47 PM

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