Features of the reaction of the support in undermining when performing a jerk in weightlifters of training groups

Relevance. The analysis of the rational technique of weightlifting exercises and taking into account the laws that ensure its effectiveness, allows you to achieve high sports and technical indicators. Additional opportunities in the study of the jerk technique are opened with the use of a strain gauge platform. Analysis of the indicators of the support reaction in different phases of the jerk and the values of articular angles can help to justify the choice of means and methods of preparation aimed at improving the technique of movements. The aim of the work is to identify biomechanical features of the support reaction when performing a jerk in weightlifters of training groups. Research methods. To identify the biomechanical features of the jerk, two exercises are considered: a jerk from the platform and a jerk from the vis from the knees. Ten weightlifters of the training stage participated in the study. To identify the dynamics of changes in the force applied by the athlete to the support, the Bertec 120x60cm strain platform was used. Comparison of the reference reactions with the jerk phases was carried out using synchronized video shooting with a Baumer camera. The Kinovea program was used to analyze the indicators of articular angles between the links of the athlete's body. The results of the study. When performing the exercise, the jerk from the vis from the knees, compared with the jerk from the platform, the angles in the knee and hip joints were of greater importance, the vertical component of the force of the support reaction in the final acceleration phase was greater and the time of the final acceleration was shorter. Such an amplitude of movement helps to reduce the execution time of the final acceleration phase and increase the vertical component of the reference reaction. Conclusion. When lifting the barbell from the vis from the knees, in comparison with performing a jerk from the platform, the vertical component of the force of the supporting reaction increases, the time of the final acceleration is reduced and the angles in the knee and hip joints increase.