Dr. Hab., Professor V.I. Zagrevskiy^{1, 3}
Dr. Hab., Professor O.I. Zagrevskiy^{2, 3
1}Mogilev State A. Kuleshov University, Mogilev, Belarus
²Tyumen State University, Tyumen
³National Research Tomsk State University, Tomsk

Objective of the study was to offer and substantiate by computation experiments basics of the athletic biomechanical system trajectory modeling using the mass-inertial characteristics and elementary kinematics of the body parts.
Methods of the study. We used for the purposes of the study system-structuring analysis and movement design mathematical/ simulation/ modeling tools to model the biomechanical system kinematics in the computation experiment.
Computation experiment was designed to model the athlete’s musculoskeletal system movements using a biomechanical system movement synthesizing mathematical toolkit. The athlete’s musculoskeletal system movement model may be described as the limited kinematic diagram of the connected bodily elements with cylindrical joints that models a biomechanical system plane rotation process around a contact/ support point
Results and conclusion. The biomechanical system trajectory modeling experiment showed that when the biomechanical system rotates around a contact point, provided the programmed control and startup conditions are the same, then:
• Growths/ falls in masses of the model elements cause no effect on the biomechanical system trajectory;
• Elementary angular velocity angular velocity is directly correlated with the length of element i.e. the higher is the element’s length the higher is the angular velocity and vice versa.

Keywords: biomechanical system trajectory, sport exercise, mass-inertial characteristics, athlete’s body elements.

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