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Autism affects motor skills, study indicates

Children with autism often have problems developing motor skills,Valentine's Day prep underway, throwing a ball or even learning how to write. But scientists have not known whether those difficulties run in families or are linked to autism. New research at Washington University School of Medicine in St. Louis points to autism as the culprit.Their findings were reported in the journal Autism.From our results, it looks like motor impairments may be part of the autism diagnosis, rather than a trait genetically carried in the family," says lead author Claudia List Hilton, PhD, assistant professor in occupational therapy and an instructor in psychiatry. "That suggests that motor impairments are a core characteristic of the diagnosis."

The researchers studied 144 children from 67 families in which at least one child had a diagnosis of autism spectrum disorder as well as at least one biological sibling in the same age group. Of the children families, there were 29 in which two had an autism spectrum disorder, including six identical twins; and 48 in which only one child had an autism spectrum disorder.The children were observed performing a range of motor skills, including placing pegs in a pegboard, cutting with scissors, copying forms, imitating movements, running, throwing a ball and doing push-ups. Researchers used a standardized measure of motor proficiency widely used in children with disabilities that measures fine manual control, manual coordination, body coordination and strength and agility.

The Washington University study is the first to evaluate motor impairments in children with autism spectrum disorder and their siblings who don't have the disorder.Hilton, along with co-author John Constantino, MD, and their team also studied the link between motor impairment and the severity of the autism spectrum disorder.Testing showed that 83 percent of children with autism spectrum disorder were below average in motor skills. Their siblings without an autism spectrum disorder generally scored in the normal range, with only 6 percent below average.

In addition, identical twin pairs had very similar scores. Non-twin siblings who each had autism spectrum disorder also had similar scores. And siblings in which one child had an autism spectrum disorder and one didn't had very different scores.

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