ABSTRACT

The human brain seems to be able to respond to low-level extremely low-frequency electromagnetic fields. Controlled laboratory studies of human sleep under exposure to such fields are scarce, especially on the effects of 1 Hz – 16 Hz fields overlapping with the frequencies of the electroencephalographic (EEG) signal (e.g., delta, theta, alpha, and sigma activities). In a double-blind placebo-controlled study, we examined the effects of exposure to low-level electromagnetic fields of frequencies 2 Hz and 8 Hz on the EEG power density spectra in the range from 1 Hz to 16 Hz and sleep structure. Sleep of 14 young healthy volunteers was polysomnographically recorded during three 50-min afternoon naps (either without exposure or with 2 Hz/0.004 μT or 8 Hz/0.004 μT electromagnetic field). During the first 30 min of a nap the sham, 2 Hz or 8 Hz/0.004 μT exposures had the same effect. For the remaining 20 min, amount of stage 3 sleep and powers in 1 Hz-8 Hz range continued to build up under the 8 Hz/0.004μT and, especially, under the 2 Hz/0.004 μT exposure, whereas they did not change in the sham condition. Therefore, the low-level 2 Hz electromagnetic fields might stimulate deep sleep in the afternoon nap.

摘要

人脑似乎能够对低电平的极低频电磁场做出反应。在这样的磁场下进行人类睡眠的受控实验室研究很少，尤其是在与脑电图（EEG）信号频率（例如，δ，θ，α和σ活动）重叠的1 Hz至16 Hz磁场的影响上。在一项双盲安慰剂对照研究中，我们检查了暴露于2 Hz和8 Hz频率的低水平电磁场对1 Hz至16 Hz范围内的EEG功率密度谱和睡眠结构的影响。在3次50分钟的午睡（未暴露或有2 Hz / 0.004μT或8 Hz / 0.004μT电磁场）下，通过多导睡眠监测仪记录了14名年轻健康志愿者的睡眠。在小睡的前30分钟内，假声为2 Hz或8 Hz / 0。004μT暴露具有相同的效果。在剩下的20分钟内，在8 Hz /0.004μT（尤其是在2 Hz / 0.004μT暴露）下，在1 Hz-8 Hz范围内的第3阶段睡眠和功率持续增加，而在3 Hz / 0.004μT暴露下则没有变化。假的条件。因此，低电平的2 Hz电磁场可能会激发午睡的深度睡眠。