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大约10%的10岁儿童发生诵读困难(dyslexia),毛发的矿物质的研究,发现学习较差和行为异常的儿童毒性金属含量较高,特别是铜、铅及镉等元素。以前报导诵读困难儿童发锌水平与正常儿童无明显差异。但苦者认为,毛发与汗液相比较,汗液更能反映锌水平,故选择26名诵读困难儿童和26名对照儿童,进行汗锌和发锌测定并进行统计学处理。结果表明,诵读困难儿童的汗锌浓度明显降低,平均浓度仅为对照组的66%(P<0.001)。而发锌的平均测定值则为对照组的99%(P<0.8ng)。在匹配的26对儿童中,25名诵读困难儿童有缺锌表现。与对照组儿童相比,大多数诵读困难儿童的头发和汗液的铬浓度较低,而铜、铅,镉的浓度较高,头发内汞浓度亦高。著者在讨论中指出,汗液锌浓度下降与诵读困
About 10% of 10-year-olds have dyslexia and hair mineralogy and found that children with poor learning and behavioral disorders have high levels of toxic metals, especially copper, lead and cadmium. Previously reported dyslexia children hair zinc levels and no significant difference between normal children. However, those suffering from bitter thought that hair compared with sweat, sweat better reflect the level of zinc, so the choice of 26 dyslexic children and 26 control children, sweat zinc and hair zinc determination and statistical analysis. The results showed that children with dyslexic sweat zinc concentration was significantly reduced, the average concentration of only 66% of the control group (P <0.001). The average measured zinc value was 99% of the control group (P <0.8 ng). Of the 26 matched children, 25 dyslexic children had zinc deficiency. Most children with dyslexia had lower concentrations of chromium and hair in the hair and sweat than those in the control group, while copper, lead and cadmium concentrations were higher and mercury concentrations in the hair were higher. The authors pointed out in the discussion that sweat zinc concentration decreased and dyslexia