預期性姿勢控制屬於姿勢控制機制之一，其作用是預測自體動作可能產生的姿勢干擾並預先產生適當的反應以減少自體動作產生的姿勢干擾與所需的平衡反應。發展性協調障礙兒童普遍有平衡缺失的問題，其平衡的缺失是否與預期性姿勢控制有關是本實驗欲探究的問題。本實驗另一個要探討的問題是預期性姿勢控制是否與姿勢干擾的大小有關。本實驗以8名4至6歲的發展性協調障礙兒童與16名年齡相當的正常發展兒童為對象，藉由三種舉手速度（慢速、普通速度、快速）與兩種地面（力板、軟墊）作為獨立變項的實驗設計，比較兩組兒童在姿勢控制上的差異。依變項包括壓力中心晃動面積、舉手的反應時間、姿勢性肌肉相對舉手動作肌肉的反應時間，與姿勢性肌肉的收縮型式。結果顯示發展性協調障礙兒童的壓力中心晃動面積較正常兒童大，舉手的反應時間較長。發展性協調障礙兒童姿勢性肌肉相對舉手動作肌肉之反應時間也較長，且多落在預期性姿勢控制的時間外，兩組間的差異不受舉手速度影響。兩組受試兒童在肌肉收縮型式則是以由近端至遠端的收縮型式占大多數。這些結果意謂著發展性協調障礙兒童平衡控制較差，可能與下肢的預期性姿勢控制缺失有關；然而預期性姿勢控制似乎不受姿勢干擾（舉手速度）的影響。

　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).

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