[[abstract]]Children with Down syndrome face difficulties in motor development. How to help these children develop their motor skills becomes research focus in early intervention. The previous research results showed proprioceptive input was very important to motor control, but how proprioceptive input influences motor performance of children with Down syndrome remain unclear. The purpose of this study was to investigate the influence of proprioceptive input on motor performance of children with Down syndrome. Repeated measure casual-comparative research design was employed in first stage of this research. One group of Down syndrome children age 4 to 7 (15 boys and 3 girls) and one group of typically developed children with chronological age matched (14 boys and 7 girls) participated in this study. Each participant received short form evaluation of Short form of Bruininks-Oseretsky Test of Motor Proficiency under three different proprioceptive input conditions to compare motor performance among three groups. Participants also received evaluation of Sensory Profile to reveal the relationship with motor performance. The results indicated motor performance of Down syndrome group was significantly lower than that of contorl group. Thirteen Down syndrome children (72.2%) were classified as disabled according to BOTMP-short evaluation result. The results of sensory profile revealed that Down syndrome children had sensory dysfunction in the domain of sensory sensitivity, poor registration, inattention and fine motor/visual percention domain. The sensory dysfunction was significant related to the performance in running speed and agility, balance, bilateral coordination, upper limb coordination, visual motor control, upper limb speed and dexterity of Down syndrome children. Unilateral increase weight over extremities input significantly decreased the motor performance of Down syndrome children but increased the motor performance of children in control group.
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