Jiang H, Fu Y T, Lu D Q
Microwave Laboratory, Zhejiang Medical University, Hangzhou.
Zhonghua Yu Fang Yi Xue Za Zhi. 1994 Sep;28(5):261-3.
A study of effects of electromagnetic field emitted by electric blankets on brain catecholamine (CA) content in fetal mice under development was carried out, to determine which component of the electromagnetic field, electric field or magnetic field or both, causes the effects, and to improve the design of the electric blankets. Forty-eight NIH pregnant mice were divided into three groups exposed to electric field, magnetic field and electromagnetic field, respectively for five hours daily during mice's whole gestational periods, and one control group. Twelve infant mice in each group were decapitated at the seventh day after delivery, and sagittal sections of the middle part of their brain were prepared for quantitative histofluorescence analysis of CA with a microspectrophotometer. Results showed brain CA content in all the exposed groups was lower than that in controls, with F values of 18.5 and 37.6 in hypothalamus and hippocampus, respectively. Both electric and magnetic fields could decrease brain CA content in mice, but electric fields had greater effects. It suggested the focus in production of electric blankets should be put on reducing electric field, as well as reducing magnetic field by cloth wiring design. Electric field lowered to less than 100 V/m for the electric blankets with such design from 1 kV/m, and magnetic field to less than 0.08 microT from 1 microT.
开展了一项关于电热毯发出的电磁场对发育中的胎鼠脑内儿茶酚胺（CA）含量影响的研究，以确定电磁场的哪个组成部分，即电场、磁场还是两者共同作用导致了这些影响，并改进电热毯的设计。48只 NIH 怀孕小鼠被分为三组，分别在小鼠整个妊娠期每天暴露于电场、磁场和电磁场 5 小时，还有一个对照组。每组 12 只幼鼠在分娩后第 7 天断头，取脑中部矢状切片，用显微分光光度计对 CA 进行定量组织荧光分析。结果显示，所有暴露组的脑 CA 含量均低于对照组，下丘脑和海马体的 F 值分别为 18.5 和 37.6。电场和磁场均可降低小鼠脑内 CA 含量，但电场的影响更大。这表明电热毯生产的重点应放在降低电场以及通过布线设计降低磁场方面。采用这种设计的电热毯，电场从 1 kV/m 降至低于 100 V/m，磁场从 1 μT 降至低于 0.08 μT。
