Biomechanical assessment of javelin throwing technique

Abstract

The relevance of research related to search for the optimality of motion technology in various phases of javelin throwing. The questions of biomechanical parameters of javelin throwing are considered at different stages of sports actions in the article. The aim of the work was determination of the rational structure of motor actions in various phases of javelin-throwing. The research was carried out on the basis of an analysis of 764 training and competitive attempts of javelin throwers. The videograms were analyzed using the software «KinoVea». Along with the phase structure of the javelin throwing, the main positions are highlighted, including initial, final and a number of intermediate provisions. To assess the movement, a number of animation positions are highlighted in the main elements of the movement. As the studied parameters were defined time parameters, angular speeds of movement of body parts, moments of inertia and radius of the moment of inertia motion, angular positions in the joints and trajectories of changes in the center of mass of links relative to the general center of mass. The research revealed kinematic and dynamic parameters of the phase structure of javelin throwing. The ranges of angular positions of the body links are revealed in various phases of throwing action. The parameters of the moment and radius of inertia positions of the body links are determined, relative to the common center of mass in different phases of motion, that allows you to predict deviations from the rational trajectory of technology and prevent the possibility of injury. The sequence of movements of the body's links is studied, taking into account the influence of kinematic and dynamic parameters of movement. The findings of research contribute to the selection of the most rational summing training exercises. In addition, it will help reduce the load on the joint and ligamentous apparatus of the thrower.