Dr.Hab., Professor V.I. Zagrevskiy^{1, 2}
Dr.Hab., Professor O.I. Zagrevskiy^2
1Mogilev State A. Kuleshov University, Mogilev, Belarus
²National Research Tomsk State University, Tomsk

Individual technical mastery is fundamental for competitive success in the sport disciplines that imply specific routines being executed and scored. The study analyzes the ways to apply a set of biomechanical movement indices for the technical mastery rating purposes, with the Tkachev reverse hecht video captures taken for the case study and analyses. The biomechanical movement indices were quantified by the video material analyses with a special priority to the rotation element of the vaulting movement sequence.
The study data demonstrate that the counter-pace element in the Tkachev reverse hecht makes provisions for the required rotation impulse in the controlled over-bar aerial phase of the exercise. The counter-pace movement direction is opposite to rotation of the body mass center radius-vector in the contact phase, particularly in the throw phase. Since in the aerial phase the body rotation axis goes via the BMC and the kinematic moment of the biomechanical system versus the body mass center (-104 kgm2/s) is constant, the joint extension-flexion movements in the aerial phase help only vary the angular speeds of the body elements without any effect on the kinematic moment of the biomechanical system versus the body mass center. 

Keywords: competitive routine, technique, motor skill, biomechanical system, kinetic moment.

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