The purpose of the study was to study the features of the influence of various training programs on increasing the volume of the body size of bodybuilders. Materials and methods. Theoretical analysis of scientific and methodological literature was used in the work. To assess the effectiveness of the impact of training loads on the muscular system of athletes, depending on the training programs used, we studied anthropometric indicators of the body. In the process of using this research method, the primary parameters of body length (cm), body weight (kg), girth dimensions (cm) and the dynamics of their changes during all stages of the study with a control interval of 1 mesocycle were recorded. Mathematical processing of research results was performed using IBM SPSS Statistics 20 software. Results and discussion. The results of research indicate that the values of training loads of bodybuilders and the nature of their changes in the same level of training of athletes and the structure of training depend on the characteristics of the selected means of training (training programs). The analysis of the obtained results shows that in the conditions of application of the second variant of the training program the indicators of the working mass of the projectile of athletes change more significantly during the whole period of research. The results reaffirm our hypothesis that the predominant use of the method of "premature fatigue" in the training process of bodybuilders at the stage of specialized basic training contributes to a more significant increase in control compared to changes in body size that can be achieved during the use of the generally accepted training program in bodybuilding. At the same time, the use of the method of "premature fatigue" in the process of optimizing the training work of bodybuilders contributes to a significant reduction in injuries, especially at this stage of training. Conclusion. Thus, the results of the study indicate that the values of training load and the nature of their changes in the mesocycles of basic training, in conditions of approximately the same level of training and the same structure of training, depend on the characteristics of training programs, i.e. a certain sequence of exercises character in training sessions. During the research it was found that the use of the second version of the program in the process of training with alternating use of basic and formative exercises for no more than two microcycles of training allows to get the most positive overall growth in body muscle size (10.0% p. <0.05)

Keywords: premature fatigue, bodybuilding, training programs, girth dimensions, basic exercises, isolation exercises

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