Motor Impairments Appear to Be a Characteristic of Autism

FRIDAY, Feb. 17 (HealthDay News) — Autism itself seems to be
responsible for the problems children with the disorder have in developing
motor skills such as running, throwing a ball and learning to write,
according to a new study.

Previously, it wasn’t clear whether these motor skill difficulties ran
in families or were linked to autism, said the researchers at the
Washington University School of Medicine in St. Louis.

The investigators studied children from 67 families that had at least
one child with autism spectrum disorder and a sibling in the same age
group. Twenty-nine families had two children with autism, including six
identical twins, and 48 families had only one child with the disorder.

The children were asked to perform a range of motor skills, including
push-ups, running, throwing a ball, placing pegs in a pegboard, imitating
movements, cutting with scissors and copying forms.

The test results showed that 83 percent of the children with an autism
spectrum disorder were below average in motor skills, while their siblings
without the disorder generally scored in the normal range, according to
the study released online in advance of publication in an upcoming print
issue of the journal Autism.

Identical twins had similar scores. Non-twin siblings who each had
autism had similar scores. But scores were markedly different in sibling
pairs in which one child had autism and the other did not, the researchers
found.

“From our results, it looks like motor impairments may be part of the
autism diagnosis, rather than a trait genetically carried in the family,”
lead author Claudia List Hilton, an assistant professor in occupational
therapy and an instructor in psychiatry, said in a university news
release. “That suggests that motor impairments are a core characteristic
of the diagnosis.”

And, she said, “the data suggests that genes play a role in the motor
impairments observed in those with autism spectrum disorder. This is
further evidence that autism spectrum disorder is a largely genetic
disorder.”

Among children with autism, the lower their motor skills’ score, the
greater their degree of social impairment and severity of autism.

“Kids who have difficulty with motor skills might have trouble with
what we think are simple things like brushing their teeth, buttoning,
snapping or starting a zipper — things that are so basic to being
independent, but would cause other problems at school,” Hilton said. “They
would need to have an aide or someone helping them, and that would set
them off as different from the other kids.”

While the study uncovered an association between autism and motor
impairments, it did not prove a cause-and-effect relationship.

More information

The U.S. National Institute of Neurological Disorders and Stroke has
more about autism.

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