Abstract
The purpose of this study was: (1) to examine the magnitude of postural sway in persons with mental retardation (PMR) according to clinical types of retardation in comparison with non-handicapped persons, and (2) to investigate the relation between magnitude of sway (MS) and body balance exercises (beam walking and one-foot balance) according to clinical types. The subjects were 134 non-handicapped persons and 45 PMR. The results were as follows: (1) The average MS of autistic persons and other PMR was about the same as that of non-handicapped children aged 4 or 5 years. Among other PMR, however, the MS distribution was relatively large. On the other hand, MS in persons with Down syndrome was generally small, and was similar to that of nonhandicapped children aged 6 years; this small MS appeared to be characteristic of the syndrome. (2) With regard to MS and body balance exercise performance, all subjects in the small magnitude group belonged to the high-performance group except for the persons with Down syndrome.
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