The aim of this paper is to highlight the significance threshold between the kinematic and dynamic characteristics of sports technique key elements and the performances achieved by junior gymnasts in uneven bars events. This scientific approach is part of the ascertaining pedagogical experiment associated to the postdoctoral thesis, at the midway point, in the end of the competitive year 2013. The following research methods have been used for this purpose: bibliographic study of specialized literature, pedagogical observation, video method for biomechanical analysis, method of movement postural orientation, statistical-mathematical and graphical representation methods. In order to make this comparative analysis, following up the biomechanical analysis of the dismounts off uneven bars, we selected the most effective biomechanical indicators of movement execution. The study results show that the comparative analysis of the biomechanical characteristics and the performances achieved by junior gymnasts in uneven bars competition, analysis made by parametric and nonparametric statistic methods, reveal different significance thresholds of the studied indicators and their relationship consistent with the kinematic and dynamic particularities of sports technique key elements.