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首页> 外文期刊>Journal of sleep research >Sleep EEG alterations: Effects of different pulse-modulated radio frequency electromagnetic fields
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Sleep EEG alterations: Effects of different pulse-modulated radio frequency electromagnetic fields

机译：睡眠脑电图改变：不同脉冲调制射频电磁场的影响

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Previous studies have observed increases in electroencephalographic power during sleep in the spindle frequency range (approximately 11-15Hz) after exposure to mobile phone-like radio frequency electromagnetic fields (RF EMF). Results also suggest that pulse modulation of the signal is crucial to induce these effects. Nevertheless, it remains unclear which specific elements of the field are responsible for the observed changes. We investigated whether pulse-modulation frequency components in the range of sleep spindles may be involved in mediating these effects. Thirty young healthy men were exposed, at weekly intervals, to three different conditions for 30min directly prior to an 8-h sleep period. Exposure consisted of a 900-MHz RF EMF, pulse modulated at 14Hz or 217Hz, and a sham control condition. Both active conditions had a peak spatial specific absorption rate of 2Wkg -1. During exposure subjects performed three different cognitive tasks (measuring attention, reaction speed and working memory), which were presented in a fixed order. Electroencephalographic power in the spindle frequency range was increased during non-rapid eye movement sleep (2nd episode) following the 14-Hz pulse-modulated condition. A similar but non-significant increase was also observed following the 217-Hz pulse-modulated condition. Importantly, this exposure-induced effect showed considerable individual variability. Regarding cognitive performance, no clear exposure-related effects were seen. Consistent with previous findings, our results provide further evidence that pulse-modulated RF EMF alter brain physiology, although the time-course of the effect remains variable across studies. Additionally, we demonstrated that modulation frequency components within a physiological range may be sufficient to induce these effects.
机译：先前的研究已经观察到，在暴露于类似手机的射频电磁场（RF EMF）之后，睡眠期间脑电图频率在纺锤频率范围内（大约11-15Hz）增加。结果还表明，信号的脉冲调制对于诱发这些效应至关重要。然而，目前尚不清楚该领域的哪些具体因素负责观察到的变化。我们调查了睡眠纺锤体范围内的脉冲调制频率分量是否可能参与了介导这些作用。在8小时睡眠期之前，每周有30位健康的年轻人在三种不同条件下暴露30分钟。曝光包括900 MHz的RF EMF，以14Hz或217Hz调制的脉冲以及伪控制条件。两种活性条件的峰值空间比吸收率均为2Wkg -1。在接触过程中，受试者执行了三种不同的认知任务（测量注意力，反应速度和工作记忆），这些任务以固定顺序呈现。在14 Hz脉冲调制的条件下，非快速眼动睡眠（第二次发作）期间，心轴频率范围内的脑电图功率增加。在217 Hz脉冲调制条件下，也观察到类似但不明显的增加。重要的是，这种暴露诱导的效应显示出相当大的个体变异性。关于认知表现，未见明显的与暴露有关的影响。与以前的发现一致，我们的结果提供了进一步的证据，表明脉冲调制的RF EMF会改变大脑的生理机能，尽管在整个研究中效果的时程仍然是可变的。此外，我们证明了在生理范围内的调制频率分量可能足以诱发这些效应。

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