Discussion
This research describes the influence of training loads of different intensity and energy supply on performance in bodybuilding. It studies the process of adaptation to training loads (machine and free weight exercises) at the stage of specialized basic training. The study results indicate that there is no significant difference between machine and free weight exercises at this stage of training. We have identified that it is the high-intensity loads in combination with the anaerobic-alactate mode of energy supply that contributed to maximum adaptive body changes. The results of this study will contribute to the optimization of training loads at the stage of specialized basic training. The obtained results will also help to better understand the processes of adaptation in bodybuilding while using high and medium intensity training loads on the background of anaerobic modes of energy supply.The lack of uniform mechanisms for training activity optimization is one of the unsolved problems in the modern training system of bodybuilding. The combination of effective load variations, principles, methods and tools is one of the most controversial scientific directions. In-depth study of adaptive body changes in bodybuilders is one of the priority areas of research in sports physiology (The greatest increase in maximum muscle strength and circumferential measurements of bodybuilders occurred during high-intensity training loads (The results of bioimpedance measurement indicate that using free weight exercises and medium intensity training load significantly decreased the level of body fat with a minimal increase in fat-free mass. Such changes in this body composition indicator highlights significant energy expenditure due to the large amount of work performed and the use of a significant number of stabilizer muscle groups during free weight exercises, as well as the possible manifestation of compensatory reactions to a physical stimulus (The indicator of the projectile working mass was 25% higher in conditions of high intensity training load, and the parameters of load volume in a series of four sets were twice smaller compared to the results found during medium intensity training load despite identical initial parameters for the development of maximum muscle strength of the examined groups. At the same time, the use of machine or free-weight exercises did not affect the parameters of these load indicators. The characteristic difference in the projectile working mass values and performed volume load depends entirely on the power load regime and the variability of the parameters of its main components. (The increase in lactate dehydrogenase activity in the blood serum of bodybuilders in response to medium-intensity training load are confirmed by the results of a series of studies in power fitness (The changes in creatinine concentration did not depend on the type of exercises. Rather, the change of this blood biochemical marker depended up on the intensity of loads and the mode of energy supply. The obtained data confirm the results of research in fitness (Thus, the obtained results indicate the expediency of using high intensity load (