TY - JOUR T1 - Analysis of the Ankle Moment-Angle Curve in Different Gait Speeds and Phases for Designing Ankle-Foot Prosthesis TT - آنالیز نمودار گشتاور زاویۀ مَفصل مچ پا در سرعت‌ها و مراحل مختلف راه‌رفتن جهت طراحی پروتز مچ‌پنجه JF - USWR JO - USWR VL - 14 IS - 4 UR - http://rehabilitationj.uswr.ac.ir/article-1-1277-en.html Y1 - 2014 SP - 90 EP - 98 KW - Walking KW - Ankle moment KW - Ankle angle KW - Ankle-foot prosthesis KW - Quasi-stiffness N2 - Objective: Aim of this study was to analysis the ankle moment-angle relation and its characteristics at different gait speeds and phases for using in prosthetic ankle-foot design. Materials & Methods: This was a cross-sectional analytic study in which 20 participants were chosen with assessable sampling method. Gait analysis at different speeds was performed with two force-plates and five high speed cameras. Ankle characteristics including quasi-stiffness and work were estimated at three periods of stance phase based on moment-angle loop. Mean differences were analyzed with repeated measure ANOVA and regression analysis was performed to fit the linear model to the data. Results: Moment-angle curve was clockwise at slower speeds and turned counter-clockwise while speed increased. The best fitted line to the work-walking speed curve had R2=0.81. There were significant differences in quasi-stiffness between fast and normal speed and slower speeds (P M3 ER -