step prediction during perturbed standing using center of pressure measurements一步预测在摄动站使用中心的压力测量.pdfVIP

Sensors 2007, 7, 459-472 sensors ISSN 1424-8220 c 2007 by MDPI /sensors Full Paper Step Prediction During Perturbed Standing Using Center Of Pressure Measurements Xavier Tortolero 1,2, Kei Masani 1,2,∗ and Milos R. Popovic 1,2 1 Rehabilitation Engineering Laboratory, Institute of Biomaterials and Biomedical Engineering, University of Toronto, 164 College Street, Toronto, Ontario, Canada 2 Rehabilitation Engineering Laboratory, Lyndhurst Centre, Toronto Rehabilitation, 520 Sutherland Drive, Toronto, Ontario, Canada E-mail: xavier.tortolero@utoronto.ca, milos.popovic@utoronto.ca ∗ Author to whom correspondence should be addressed; E-mail: k.masani@utoronto.ca Received: 23 February 2007 / Accepted: 13 April 2007 / Published: 18 April 2007 Abstract: The development of a sensor that can measure balance during quiet standing and predict stepping response in the event of perturbation has many clinically relevant applica- tions, including closed-loop control of a neuroprothesis for standing. This study investigated the feasibility of an algorithm that can predict in real-time when an able-bodied individual who is quietly standing will have to make a step to compensate for an external perturbation. Anterior and posterior perturbations were performed on 16 able-bodied subjects using a pul- ley system with a dropped weight. A linear relationship was found between the peak center of pressure (COP) velocity and the peak COP displacement caused by the perturbation. This r