Kinematic and dynamic parameters of final stage of javelin throwing

Javelin throwing characterizes by creation of dynamic effort in shoulder-girdle during the process of movement. The emergence of excessive efforts in the joints of the parts of the body performing this sport exercise leads often to injury to the athlete. In this regard, the actual direction of training and competitive activity is the coordination and rationalization of movements in accordance with the principle of bionic adequacy of the system (in this case, “thrower - javelin”), the result of which is the maximum effectiveness of the exercise in the absence of traumatic effects of loads and movements. Biomechanical analysis of the final stage of javelin throwing was performed on the basis of 659 videos of competitive attempts. The results of measuring the angular displacements of the links of the body relative to each other and the common center of mass of the body in various nodal elements of motion are presented. In the work, the method of posture reference points of movements was used, which made it possible to distinguish starting and final movements, as well as a number of animated positions. Prediction of changes in the position of the body links taking into account the moments and radius of inertia of the links relative to the general center of mass of the thrower body allow us to take preventive measures to exclude deviations from the given optimal trajectory of the body parts. The determination of the ranges of angular positions in the joints of the parts of the body also contributes to the achievement of high sports results.