芬兰图尔库大学、芬兰职业健康研究所和芬兰辐射与核安全中心开展的一项最新研究发现，手机辐射会减弱靠近手机天线的大脑区域的葡萄糖新陈代谢。大脑葡萄糖代谢下降表明大脑局部神经元活动受到抑制，是脑功能失调的表现之一。
芬兰研究人员先让13名年轻的健康男性受试者暴露在脉冲调制在902.4兆赫的手机通信信号中，时间长达33分钟。随后研究人员对他们的脑部进行了正电子发射断层成像扫描。结果显示，受试者暴露在手机辐射中的头部一侧的大脑前颞叶的葡萄糖代谢率大幅降低。
常用的全球通（GSM）手机信号频段就是900兆赫。研究人员称，新发现表明短期手机辐射可抑制大脑局部的能量代谢。
研究人员解释说，葡萄糖是供给大脑活动的主要能量来源，大脑葡萄糖代谢的状况在一定程度上可以反映脑功能的状况。葡萄糖代谢水平下降表明，大脑局部神经元活动受到抑制，是脑功能失调的表现之一。
近年来，有关手机对大脑影响的研究已进行了多次。但由于所采用的方法和背景不同，迄今并无一致的结论，反而引起很大争议。比如，有的研究称手机可能诱发脑癌，有的则认为无此风险。芬兰这一研究成果发表后也可能引起新争议。
生物探索推荐英文文章阅读：
Mobile phone radiation weakens glucose metabolism in the brain in areas under the device’s antenna, according to fresh research from the University of Turku. During the study, 13 healthy young men were exposed to the GSM signal for 33 minutes.
“This is an important research result because now it’s proven that radiation spreads to the head and causes changes to neurons,” says Turku University Professor Heikki Hämäläinen, who led the research.
The study was accomplished with the aid of a Positron emission tomography (PET) scanner.
“For the first time in the world, three different research methods were combined: study of the skin temperature, radiation research and metabolic research,” Hämäläinen clarifies.
Expensive and difficult
Mobile phone radiation is a research subject across the globe.
“PET studies are rarely done because they are expensive and difficult,” says Hämäläinen.
On the basis of this research, it is not yet possible to draw conclusions regarding health hazards of mobile phone radiation. The study was part of the nationwide Wirecom project sponsored by the Finnish Funding Agency for Technology and Innovation.
“Radiation slows down metabolism, but it does not raise temperature,” explains Hämäläinen. “Now it would be good to launch a more extensive follow-up study in which we would continue making good use of the PET Centre’s imaging methods.”
The study was the result of cooperation between the Centre for Cognitive Neuroscience at the University of Turku, the Turku PET Centre, the Finnish Institute of Occupational Health and the Finnish Radiation and Nuclear Safety Authority.
