Anticipatory Postural Adjustment of Standing in Children with Developmental Coordination Disorder

• Main Authors: Ping-Shan Chang, 張萍珊
• Other Authors: Rong-Ju Cherng
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/92841921428421101218

碩士 === 國立成功大學 === 物理治療研究所 === 93 === 　Anticipatory postural adjustment (APA), a part of the postural control mechanism, is an ability to predict the potential disturbance of an active movement and in advance adjust the center of mass in order to reduce the perturbation. Children with developmental coordination disorder (DCD) typically present balance deficit. We wonder if the balance deficit in children with DCD is related to a deficit in APA? If the APA is related to the size of postural perturbations? Eight children with DCD (4-6 years) and 16 age comparable normal children performed arm raising movements (slow, normal and fast three velocities) in two standing supports (force platform and foam). The center of pressure (COP) sway area, reaction time of arm movement, relative latency of postural muscle (relative to anterior deltoid), and reactive movement patterns were compared between groups. APA was operationally defined as the muscle activities occurring at the range of relative latency of –50 to 150 ms. Results showed that children with DCD presented bigger COP sway area and longer reaction time. The relative latency of postural muscles was longer in children with DCD than in normal children. In additions, the activities of postural muscles in children with DCD were outside the range of APA. The difference of relative latency of postural muscles between groups was not affected with arm raising velocity. Both groups of children adopted the proximal to distal postural strategy more often than the distal to proximal strategy. The results implicate that the balance deficit is associated with the deficit of APA in children with DCD and the APA is not related to the size of postural perturbation (arm raising velocity).