The purpose of the study was to analyze the variability of performance and kinematics of different shot put techniques in elite athletes (group A: 5 athletes using the rotational technique and 3 athletes using the glide technique) and sub-elite athletes (group B: 3 athletes using the rotational technique and 3 athletes using the glide technique). Each athlete performed 6 trials. Only 34 trials in group A and 27 trials in group B were analyzed. Two high-speed digital cameras were positioned 8 m from the center of the shot put throwing circle. All throws performed during international and national competitions were analyzed using the Ariel Performance Analysis System. To estimate variability of kinematic parameters, the value of relative error was calculated. The average relative error generally showed low variability for the analyzed indicators. In only 4 analyzed cases, variability was high (>20%). Statistical analysis was used to find indicators which have a significant influence on the distance of the throw (according to the sports level and technique). Significant inverse correlations (at p < 0.05) between the distance and the average relative error of the selected indicators were mainly obtained, which meant that the distance was longer when the value of variability (average relative error) was low. The research results show that greater repeatability of the technique (lower RE) has a significant impact on the length of the shot put.
Keywords: 3D kinematic analysis; biomechanical parameters; relative error; throwing.