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Cell phone use may have effect on brain activity - plastic extrusion mould for wholesale by wang dong





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Cell phone use may have effect on brain activity - plastic extrusion mould for wholesale by
Article Posted: 08/09/2015
Article Views: 517
Articles Written: 1102
Word Count: 434
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Cell phone use may have effect on brain activity - plastic extrusion mould for wholesale


 
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In a preliminary study, researchers found that 50-minute cell phone use was associated with increased brain glucose metabolism (a marker of brain activity) in the region closest to the phone antenna, but the finding is of unknown clinical significance, according to a paper to be published Wednesday in the Journal of American Medical Association.

"The dramatic worldwide increase in use of cellular telephones has prompted concerns regarding potential harmful effects of exposure to radiofrequency-modulated electromagnetic fields (RF- EMFs). Of particular concern has been the potential carcinogenic effects from the RF-EMF emissions of cell phones. However, epidemiologic studies of the association between cell phone use and prevalence of brain tumors have been inconsistent, and the issue remains unresolved," according to background information in the article.

Nora Volkow, of the U.S. National Institutes of Health, and colleagues conducted a study to assess if cell phone exposure affected regional activity in the human brain. The randomized study, conducted between Jan. 1 and Dec. 31, 2009, included 47 participants. Cell phones were placed on the left and right ears and brain imaging was performed with positron emission tomography (PET) with fluorodeoxyglucose injection, used to measure brain glucose metabolism twice, once with the right cell phone activated for 50 minutes ("on" condition) and once with both cell phones deactivated ("off" condition). Analysis was conducted to verify the association of metabolism and estimated amplitude of radiofrequency-modulated electromagnetic waves emitted by the cell phone. The PET scans were compared to assess the effect of cell phone use on brain glucose metabolism.

The researchers found that whole-brain metabolism did not differ between the on and off conditions. However, there were significant regional effects. Metabolism in the brain region closest to the antenna was significantly higher (approximately 7 percent) for cell phone on than for cell phone off conditions. " The increases were significantly correlated with the estimated electromagnetic field amplitudes both for absolute metabolism and normalized metabolism," the authors write. "This indicates that the regions expected to have the greater absorption of RF-EMFs from the cell phone exposure were the ones that showed the larger increases in glucose metabolism."

"These results provide evidence that the human brain is sensitive to the effects of RF-EMFs from acute cell phone exposures," the researchers write. They add that further studies are needed to assess if these effects could have potential long- term harmful consequences.

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