PhD, Associate Professor L.A. Khasin¹
PhD S.B. Buriyan^1
1Moscow State Academy of Physical Culture, Moscow

An important element of the weightlifter technique analysis is determining the force of the interaction between an athlete and the grip. Objective of the present study was to offer a computation method to estimate horizontal forces in the classical snatch sequence with account of the grip elasticity. The authors applied mathematical modeling tools and a filtration algorithm for the study purposes; the elastic line equation as a basis for the mathematical model; and video captures to mine the data for the model. Sampled for the study were elite weightlifters whose techniques were tracked with a special attention to the grip bounce on the thighs. The video captures were used to profile the grip track, speed and acceleration rates and produce the mathematical model with the grip contact points and thigh movement sequence. An elastic beam model with the moving rest points (thighs) was used to compute the horizontal force applied by the athlete to the grip: it was estimated at 195.5kg. The maximal grip bounce was found to reach 0.07m, with the high bounce found to increase the probability of success.

Keywords: biomechanics, grip elasticity, weightlifting, grip bounce.

References

1. Khasin L.A., Buryan S.B. Svidetelstvo o gosudarstvennoy registratsii programmy dlya EVM. Raschet kinematicheskih i dinamicheskih harakteristik dvizheniya shtangi [Certificate of state registration of computer program. Calculation of kinematic and dynamic characteristics of barbell movement]. (RF). # 2017613826 data gos. registratsii v Reestre programm dlya EVM 03.04.2017. 1 p.
2. Khasin L.A., Buryan S.B. Svidetelstvo o gosudarstvennoy registratsii programmy dlya EVM. Raschet kinematicheskikh i dinamicheskikh harakteristik po progibu grifa shtangi v protsesse vypolneniya tyazheloatleticheskikh uprazhneniy [Certificate of state registration of computer program. Calculation of kinematic and dynamic characteristics of barbell bend in weight-lifting exercises]. (RF). # 2018615517, date of state. registration in the Register of computer programs 08.05.2018. 1 p.
3. Khasin L.A. Biomekhanicheskiy analiz tekhniki tyazheloatleta pri vypolnenii ryvka klassicheskogo na osnove skorostnoy videos'emki i kompyuternogo modelirovaniya [Biomechanical Analysis of Weightlifter During Classic Jerk Based on High-Speed Video Recording and Computer Simulation]. Teoriya i praktika fiz. kultury. 2013. no.11. pp. 100-104.
4. Khasin L.A. Biomekhanicheskiy analiz tekhniki vypolneniya ryvka sovremennymi tyazheloatletami vysokoy kvalifikatsii s ispolzovaniem skorostnoy videos'emki i matematicheskogo modelirovaniya [Biomechanical analysis of elite weightlifter's classic jerk using high-speed video recording and computer simulation]. Vestnik sportivnoy nauki. 2017. no.1. pp. 13-19.
5. Khasin L.A., Drozdov A.L. Metodika i rezultati analiza tekhniki vypolneniya ryvka klassicheskogo [Classic jerk technique: methods and results]. Uchenye zapiski universiteta im. P.F. Lesgafta. 2019. no.  1 (167). pp.  312-318
6. Khasin L.A., Rafalovich A.B., Androsov P.I. Sravnitelny analiz prostranstvenno-vremennykh kharakteristik ryvka shtangi v udachnykh i neudachnykh popytkakh tyazheloatletov vysokoy kvalifikatsii [Comparative analysis of spatio-temporal characteristics of jerk in successful and failure reps in highly skilled weightlifters]. Uchenye zapiski universiteta im. P.F.  Lesgafta. 2018. no. 11 (165). pp. 386-391.
7. Khasin L.A. Biomechanical analysis of weightlifter during classic jerk based on high-speed video recording and computer simulation. Theory and Practice of Physical Culture. 2013. no. 11. pp. 24.