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研究发现杀虫剂易导致儿童多动症

kira86 于2010-05-26发布 l 已有人浏览
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Study Ties Some Pesticides to Risk of ADHD in Children高速下载 This is the VOA Special English Health Report.A
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Study Ties Some Pesticides to Risk of ADHD in Children


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This is the VOA Special English Health Report.

A.D.H.D. is attention deficit hyperactivity disorder. Government estimates say three to seven percent of school-age children in the United States have it. Adults can also have it. People with A.D.H.D. have problems with paying attention, controlling their behavior and being overly active.

Now, a study has linked an increased risk of A.D.H.D. in children to exposure to some kinds of pesticides. The chemicals are known as organophosphate pesticides. They kill insects by attacking their nervous systems. Earlier studies have shown that some of the compounds cause hyperactivity and thinking deficits in laboratory animals.

Researchers at the University of Montreal in Canada and Harvard University in Massachusetts did the study. It involved more than one thousand one hundred children between the ages of eight and fifteen. One hundred nineteen of them were identified as having A.D.H.D.

The researchers tested all the children for products that break down from organophosphates. Maryse Bouchard of the University of Montreal and Harvard lead the research team. She says, "The higher the level of pesticide residue in the urine, the higher the risk of A.D.H.D. in the children."

The scientists reported that the risk of the disorder was almost double in children with high levels compared to those with no measurable level. They say exposure at levels common among children in the United States may increase the chances that a child will be diagnosed with A.D.H.D.

Maryse Bouchard says the study found that exposure could play a part in behaviors such as inattention and hyperactivity. But she also says the study does not prove that the chemicals cause the disorder.

MARYSE BOUCHARD: "We can't affirm that exposure to pesticides is causing A.D.H.D. We would need a different type of study to say that."

The researchers say forty organophosphate pesticides are registered with the United States government. The chemicals are used to protect fruits and vegetables. They are also used to poison insects in other places such as homes.

Lynn Goldman is an environmental health scientist at Johns Hopkins University School of Public Health in Maryland. She notes that the use of pesticides, including organophosphates, is widespread in developing countries. Children come in contact with high levels of pesticides through farming.

LYNN GOLDMAN: "And those kids have much more serious, much more severe neurological problems. So we do see evidence of effects in those populations globally."

The study was published in the journal Pediatrics.

And that's the VOA Special English Health Report, written by Caty Weaver with Jessica Berman. I'm Steve Ember.

相关新闻报道:

美国一项研究显示,儿童接触到杀虫剂,可能提高患多动症的风险。

研究人员检测了儿童尿液中杀虫剂分解物水平,结果发现分解物水平高的儿童,患多动症风险几乎是其他儿童的两倍。

哈佛大学公共卫生学院研究员韦斯科夫(Marc Weisskopf)参与了此项研究,他说:“人们越来越担心,杀虫剂可能与多动症有关联。”

“而此项研究的一个重要发现是,即便是低浓度杀虫剂也可能导致多动症。”

韦斯科夫指出,虽然研究人员无法确定尿液中杀虫剂分解物的来源,但最大的可能是农产品残留的杀虫剂和室内杀虫剂。

韦斯科夫与同事研究了1,139名8-15岁少年儿童,发现约10%的孩子符合多动症的标准。

在综合考虑性别、年龄、种族等因素後,研究人员得出的结论是,尿液中杀虫剂分解物水平越高,患多动症的几率就越高。

韦斯科夫指提醒家长使用杀虫剂和清洗食物时要留心。

他说:“在食用水果和蔬菜前一定要洗干净,这绝对有帮助。”

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