Objective of the study was to develop kinematic criteria for assessing local loading on the athletes' locomotor system to further plan rehabilitation activities. Methods and structure of the study. The study involved the young athletes and dance school students with lower limb injuries and in need of rehabilitation. The study was carried out using the optoelectronic 3D motion capture system "Qualisys". Subsequent data analysis was carried out using a specially designed mathematical model in the statistical computing language R (R programming language) in the RStudio environment. Results and conclusions. A mathematical model was developed to evaluate the smoothness of the movement trajectory of individual links of the locomotor system, which makes it possible to assess the dynamics and adequacy of local physical load during rehabilitation activities. The kinematic criteria were developed to rate local loading during the rehabilitation of athletes. The developed concept and mathematical model aimed to analyze the smoothness of the movement trajectory formed the basis of a new perspective tool that enables to rate local loading on the athletes' locomotor system while planning rehabilitation activities.
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