Effects of the type and direction of support surface perturbation on postural responses

doi:10.1186/1743-0003-11-50

中山醫學大學機構典藏 CSMUIR > 醫學科技學院 > 物理治療學系暨碩士班 > 期刊論文 > Item 310902500/10439

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题名:	Effects of the type and direction of support surface perturbation on postural responses
作者:	Chiung-Ling Chen Shu-Zon Lou Hong-Wen Wu Shyi-Kuen Wu Kwok-Tak Yeung Fong-Chin Su
贡献者:	中山醫學大學
关键词:	Surface perturbation;Posture;EMG, Center of mass, Kinematics
日期:	2014-04-07
上传时间:	2015-03-11T04:53:34Z (UTC)
ISSN:	1743-0003
摘要:	Background Postural control is organized around a task goal. The two most frequently used types of tasks for postural control research are translational (translation along the anterior-posterior axis) and rotational (rotation in sagittal plane) surface perturbations. These types of perturbations rotate the ankle joint, causing different magnitudes and directions of body sway. The purpose of this study was to investigate the effects of the type (translation vs. rotation) and direction (forward/toe up vs. backward/toe down) of the perturbation on postural responses. Method Nineteen healthy subjects were tested with four perturbations, i.e., forward and backward translation and toe up and toe down rotation. The onset latency and magnitude of muscle activations, angular changes, and COM displacements were measured. In addition, the kinematic data were divided into two phases. The initial phase reflected the balance disturbance induced by the platform movement, and the reversal phase reflected the balance reaction. Results The results showed that, in the initial phase, rotational perturbation induced earlier ankle movement and faster and larger vertical COM displacement, while translational and forward/toe up perturbations induced larger head and trunk angular change and faster and larger horizontal COM displacement. In the reversal phase, balance reaction was attained by multi-joint movements. Translational and forward/toe up perturbations that induced larger upper body instability evoked faster muscle activation as well as faster and larger hip or knee joint movements. Conclusions These findings provide insights into an appropriate support surface perturbation for the evaluation and training of balance.
URI:	https://ir.csmu.edu.tw:8080/ir/handle/310902500/10439 http://dx.doi.org/10.1186/1743-0003-11-50
關聯:	Journal of NeuroEngineering and Rehabilitation 2014, 11:50
显示于类别:	[物理治療學系暨碩士班] 期刊論文

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