电热毯电场磁场对子代脑儿茶酚胺的影响

Effects of Electromagnetic Fiedld Emitted by Electric Blandets on Brain Catecholamine in Fetal Mice

研究电热毯对胎鼠脑发育中儿茶酚胺（ＣＡ）含量的影响，和探讨其电磁场的作用成分，即由电场还是磁场或两者所致，以指导改进电热毯的设计。采用４８只ＮＩＨ孕小鼠，分为电场、磁场、电场和磁场，以及对照组，每天暴露５ｈ（包括整个孕期）。每组取１２只子鼠，在第７天处死，作脑中部矢状切片，供ＣＡ组织荧光的定量分析。结果表明，所有暴露组ＣＡ含量都低于对照组，下丘脑和海马部位的下值分别为１８．５和３７．６。从４组比较看出，虽电场和磁场都可使ＣＡ下降，但电场的作用较大。本研究提出在目前美国有些工厂以布线降低磁场的同时，应该更着重降低电场。本研究设计的电热毯电场由１ｋＶ／ｍ降到＜１００Ｖ／ｍ，磁场由１μＴ降到＜０．０８μＴ。

study of effects of clectromagnetic field emitted by clectric blankets on brain catecholamine(CA)content in fetal miee under developmcn t was camed out, to detemine which component of the electromagnetic field,electric field or magnetic field or both,causes the effects,and to improve the de-sign of the electric blankets.Forty-eight NI H p regnant miee were divided into three groups exposed to elctric field,magnetic field and electromagnetic field, respectively for five hours daily d uring miee′s whole gestational periods,and one control group。Twclve infeant mice in each group were decapitated at the seventh day after delivery,and sagittal secti ons of the middle part of their brain were prepared for quantitative histofluorescenee analysis of CA with a microspectrophotometer.ResuIts showed brain CA content in all the exposed gro ups was lower than that in controls,with F values of 1 8.5 and 3 7.6in hypothalamus and hippocampus,respectively.Both electric and magnetic fields could deerease brain CA content in mice,but electric fiels had greater effects.It suggested thebcus in production of electric blankets should be put on reduling electric tield,as well as reducing magnetic field by cloth wiring de sign。Electric field lowered to less than 100 V/m for the electric blankets with such design from 1kV/m,and magnetic field to less than 0.08 μT from 1μT。