Analysis of the snatch with high-speed camera and mathematical modeling

Aim. The paper aims to develop a method of evaluating the symmetry of the snatch through time and space characteristics along with the kinematic and dynamic characteristics of the movement patterns of the barbell. Materials and methods. High-speed video recording with four cameras is used to obtain the kinematic and dynamic characteristics of movement patterns. The technique of video analysis is described to get data on movement patterns from the right and left ends of the barbell. A digital filter and mathematical models of the snatch are used for the processing of video data. Results. Exercise sessions were simultaneously shot with four high-speed cameras (250 fps), and the data obtained was processed to calculate movement characteristics that allow for evaluation and analysis of the symmetry of exercise performance. Vertical and horizontal displacements, velocities, and accelerations were calculated for the ends of the barbell. The vertical and horizontal forces applied to the right and left weight plates were measured. The data obtained was used to determine barbell rotation relative to two axes. The onset of asymmetry (turns) and its reasons were identified. Conclusion. A complex, non-contact technique was developed to calculate parameters related to the onset of asymmetry.