The Plantar Pressure Distribution among Low Back Pain Patients in Static and Dynamic Positions
Spring 2015, Volume 3 - Number 9 (4 صفحه - از 263 تا 266)
"c om ISSN (Online): 2322 – 4479 Roundhouse Kick’s Variability in Kinematic Coupling Assessed by Continuous Relative Phase and Vector Coding in Elite Taekwondo Players 1Kamran Azma, 2Hamid Reza Barnamei∗ 1. In light of these differences, there is no assurance that vector coding and CRP convey similar information on the structure of variability when they are used to study a particular movement. com Issue were to directly compare roundhouse kick’s variability quantified by vector coding and CRP in Taekwondo, and to determine if these techniques convey similar information on variability. In experimental setup, we chose the roundhouse kick being testing movement, which is the most frequently used technique in competitions, the Motion Analysis System with 5 high speed cameras (S Infrared, Vicon camera, Oxford metrics, Oxford, UK) were used to collect the kinematics data (sampling rate at 200 Hz) through tracking the 22 makers automatically, and then the joint velocity and angular velocity for each lower limb were derived from the time series."
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Figure 1: Angular Position-Angular Velocity of Hip and Knee joints
The pattern of inter-joint coordination of CRP and VC was compared by descriptive descriptions with in phase (CRP = 0° or ± 360°; VC = 45° or 225°) and out of phase (CRP = ± 180°; VC =
135° or 315°). The variability of inter-joint coordination of CRP and VC was calculated as the average standard deviation of all points on the ensemble CRP and VC curves over a Roundhouse’s Taekwondo for each subject, namely the deviation phase (DP). DP values represent the turn to return variability and a lower DP value indicates a more repeatable coordination between two joints.
Figure 2: Angle (Knee)-Angle (Hip) Diagram
The alternations of coordination patterns between in phase and out of phase were generally in similar fashion in both techniques, except the initial contact of hip-knee coordination. While VC seemed to have greater ranges of fluctuations on the patterns than CRP, CRP seemed to have sharper inflexion points on knee-ankle inter-joint coordination than VC. The DP values for both
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