Validation of the biomechanical analysis system silicon coach (2d) against vicon (3d) using a rugby union place kick
University of Wales Institute Cardiff
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The purpose of this study was to validate the two-dimensional analysis system of Silicon Coach using the three-dimensional analysis system of Vicon. A Rugby Union place kick was the movement skill used in this study. Three National level rugby players were chosen to participate in this study. All were students at the University of Wales Institute Cardiff. All played regularly in the First Division of the WRU National League. The three subjects were experienced kickers. The subjects ranged from 22-24 years of age. Each participant was required to perform ten kicks from a set location at a target vertically in front Three key kinematic variables of the dominant (kicking leg) lower limbs were determined from literature. These were identified as the hip, knee and ankle. Retro-reflective markers were attached to each of the participants. The kicks were performed indoors in the National Indoor Athletic Centre Cardiff (NIAC). For the Silicon Coach (2D) data collection a Sony digital DSR-PD100AP video camera was used and recorded at 50Hz using a shutter speed of 1/600. This camera was mounted on a Manfrotto 117 rigid tripod at a height of 1.3m. The three-dimensional collection equipment were positioned around the movement area. A static and dynamic calibration was performed. The Mathcad System was used to interpolate the data to a hundred point allowing comparisons to be made between the two systems. A Root Mean Square Difference (RMSD) statistical analysis was conducted and expressed as a percentage of the range. These statistical analyses showed a difference between the two systems for each of the key kinematic variables. The greatest difference was observed for the ankle and the least for the hip. There were many possible reasons for these differences observed. Many sources of error were identified with Silcion Coach. The two-dimensional nature of Silicon Coach did not consider movement outside the plane of movement. Factors such as rotation were therefore ignored. Parallax and perspective error was greater with Silicon Coach along with poor picture quality leading to errors in the identification of anatomical landmarks. However Silicon Coach produced the same movement patterns as Vicon and could therefore be an useful tool for coaches.
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