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Relationship between improvements in motor performance and changes in anticipatory postural adjustments during whole-body reaching training

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Title: Relationship between improvements in motor performance and changes in anticipatory postural adjustments during whole-body reaching training
Authors: Saito, Hiroshi Browse this author →KAKEN DB
Yamanaka, Masanori Browse this author →KAKEN DB
Kasahara, Satoshi Browse this author →KAKEN DB
Fukushima, Junko Browse this author →KAKEN DB
Keywords: Focal learning
Reaching movement
Anticipatory postural adjustment
Muscle activity
Motor performance
Issue Date: Oct-2014
Publisher: Elsevier Science
Journal Title: Human Movement Science
Volume: 37
Start Page: 69
End Page: 86
Publisher DOI: 10.1016/j.humov.2014.07.001
PMID: 25108269
Abstract: Anticipatory postural adjustments (APAs) provide postural stability and play an important role in ensuring appropriate motor performance. APAs also change in various situations. However, it is unknown whether changes in APAs during repetitive movement training contribute to improvement in motor performance. This study aimed to investigate the relationship between improvement in motor performance and changes in APAs during repeated reaching training, as well as the learning effects on APA changes. Sixteen healthy subjects (23 +/- 2 years of age) stood barefoot on a force platform and reached as quickly and accurately as possible to a target placed at their maximum reach distance immediately following a beep signal in a reaction time condition. Whole-body reaching training with the right arm was repeated 100 times for three consecutive days. Motor performance and APAs were evaluated on the first day, after discontinuation of training for one day, and again at three months. In addition, reaching with the left arm (untrained limb) was tested on the first and the fifth training day. Body position segments were measured using three-dimensional motion analysis. Surface electromyography of eight postural muscles in both lower limbs was recorded. Kinetics data were recorded using the force platform. Whole-body reaching training induced not only improvements in motor performance (e.g., increased peak hand velocity), but also changes in APAs (e.g., earlier APA onset and increased amplitude). These changes were strongly correlated with and occurred earlier than improvements in motor performance. The learning effects on APAs were retained after the discontinuation of training and were generalized to the untrained limb. These results suggest that change in APAs contributes to improvement in motor performance; that is, the central nervous system may be able to adapt APAs for improvement in motor performance. (c) 2014 The Authors. Published by Elsevier B.V.
Type: article (author version)
Appears in Collections:保健科学院・保健科学研究院 (Graduate School of Health Sciences / Faculty of Health Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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