Synchronization of biomechanical indicators of clean and jerk style key elements in performance weightlifting

This paper reveals the synchronization of the kinematic and dynamic indicators of the key elements of clean and jerk technique in performance weightlifting. This scientific approach has led to a study conducted during the European Weightlifting Championship for juniors, Bucharest, 2011, with a group of 7 athletes, finalists of 56 kg class. The methodology of the research focused on video recording, transformation of video capture in AVI format (Pinnacle studio 9) and biomechanical video analysis of weightlifters' executions by means of a specialized program named Physics ToolKit. In order to highlight the synchronization of the key elements of clean and jerk style technique, the biomechanical analysis was made in two parts: 1) start, straightening, flipping, high pull, lifting from hockey - moment of concentration; 2) split jerk, the drive and the overhead barbell locking The study results point out the synchronization of barbell movement characteristics with the technique key elements in clean and jerk style at 56 kg category; the synchronization of the horizontal and vertical speed; opposite values in execution and small by calculation, which means a desynchronization of the phase; synchronization of the strength and energy characteristics; performances achieved in competitions and correlation of the biomechanical indicators with the performances obtained in competitions. The effectiveness of the synchronization of clean and jerk technique key elements was proved by execution duration, very small differences of the horizontal displacement in the first and second part of the analysis and also by the close values in vertical displacement and their resultant. The effectiveness of the synchronization of the key elements biomechanical indicators of the clean and jerk technique in accordance with the results achieved in 56kg competition highlight close connections at p