Analysis of center of body mass travel trajectory when performing major inner reaping throw

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Dr.Hab., Professor A.G. Levitsky1
PhD D.A. Matveyev2
PhD, Associate Professor A.A. Potsipun2
PhD, Associate Professor S.A. Kraev3
1Lesgaft National State University of Physical Education, Sport and Health, St. Petersburg
2St. Petersburg State University, St. Petersburg
3Federal State-Owned «Military Educational Institution of Logistics named after General of the Army A.V. Khrulyov» of the Ministry of Defense of the Russian Federation

Objective of the study was to construct and study the travel trajectory of Tori’s body general center of mass when practicing the major inner reaping, inside trip.
Methods and structure of the study. The study was carried out using a video from the Internet network. The video recording was split into frames. The PaintBrush program was used to mark the centers of mass (CM) of each body segment (head, torso, forearms, etc.) on each frame. The athletes performing the move were attributed to the same weight category. The body mass of each athlete was set equal to one. Accordingly, the mass of each body segment became numerically equal to the percentage ratio to the body mass, which is well known from the biomechanics course. Tori’s center of mass travel trajectory is divided into three phases. During the first phase, Tori’s CM shifts along the vertical axis (Y-axis). It is the phase where the balance is disturbed. At this point, the hold is applied, Uke’s CM is shifted towards an optimal position, and thus, the model is set up for work. During the second phase, Tori’s CM shifts towards the initial position. It is the phase where the model is brought into operation. During the third phase, the training partner is taken down.
Results and conclusions. The analysis of Tori’s center of mass travel trajectory revealed that during the major inner reaping throw, CM oscillates. It is advisable to include in the training process exercises related to shifting own CM along the oscillating trajectory. This will facilitate the formation of movements that reflect specific biomechanical characteristics of the throw.

Keywords: biomechanics, judo, sambo, HIZA-GURUMA.

References

  1. Ivanova G.P., Kichaykina N.B., Samsonova A.V. Biomekhanicheskie metodiki analiza i otsenki tekhniki sportivnykh dvizheniy [Biomechanical methods of analysis and evaluation of technique of sports movements]. Teaching aid. Lesgaft SPbSUPE. St. Petersburg, 2007. 62 p.
  2. Levitskiy A.G., Matveyev D.A., Potsipun A.A. et al. Biomekhanicheskaya klassifikatsiya priemov sportivnoy borby [Biomechanical classification of actions in wrestling]. Teoriya i praktika fiz. kultury, 2017, no. 10, pp. 66-68.
  3. Available at :http://www.academia.edu/2401906/A_Biomechanical_Reassessment_of_the_Scie... [date of access 10.02.2018]
  4. Available at: https://www.youtube.com/watch?v=VDsiBURKj-s [date of access: 21.08.2018}