Clinical Neurology and Neurosurgery 129 S1 (2015) S53–S57

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Clinical Neurology and Neurosurgery j o u r n a l h o m e p a g e : w w w. e l s ev i e r. c o m / l o c a t e / c l i n e u r o

Within-session acquisition of anticipatory postural adjustments during forward reaching task Wen-Yu Liua, Yang-Hua Lina, Hen-Yu Liena, Lin-Ya Hsua,b, Yi-Ju Tsaia,b, Chia-Fang Liaoa,b, Simon Fuk-Tan Tangc,d,* Department of Physical Therapy and Graduate Institute of Rehabilitation Science, College of Medicine, Chang Gung University, Taiwan Healthy Aging Research Center, Chang Gung University, Taiwan c Department of Physical Medicine and Rehabilitation, Chang Gung Memorial Hospital, Linkou, Taiwan d School of Medicine, Chang Gung University, Taiwan a

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abstract

Anticipatory postural adjustments Forward reaching Healthy adult Within-session acquisition

Objective: To describe the acquisition of anticipatory postural adjustment (APA) in healthy adults during standing forward reaching. Design: Repeated-measures design. Subjects/Patients: Ten healthy subjects. Methods: Within one day, all subjects practiced forward reaching to a moving target for sixty trials (10 trials, 6 blocks). APAs were recorded by electromyography (EMG), center of pressure (COP), and kinematic measurements. Repeated measure ANOVA was used to compare the changes of APA among the six blocks. Results: All subjects showed basic APA patterns in the beginning, such as posterior shift of COP and tibialis anterior firing first. The adults demonstrated significantly quicker onset of posterior shift of COP between block 2 and 6 (p