Introduction
hypertrophy
BLOOD, HYPERTROPHY
Improving the training process by optimizing loads is one of the main issues in bodybuilding. There is a constant search for effective combination of strength exercises and training programs. The issue of adaptation to a stressful stimulus in bodybuilding remains relevant. Adaptation changes are of great interest among leading specialists (The impact of training loads different in volume and intensity on adaptation processes in untrained people is of steady interest among scientists. Scientists in sports physiology and fitness have been paying attention to the research of this problem in recent years (The complex use of morphometric and physiological indicators allows to evaluate the effectiveness of training loads and their adequacy to body capabilities. Blood biochemical markers helped to determine the nature of adaptive and compensatory reactions to a physical stimulus in different regimes of training loads. At the same time, the control of biochemical blood markers shows the level of resistance to training loads in certain modes of energy supply. It is known that the growth of maximum strength and muscle mass occurs after loads in anaerobic modes of energy supply (alactate and glycolytic). These changes occur due to hypertrophy of fast-twitch muscle fibers, growth of intra-muscular and inter-muscular coordination. The alactate and glycolytic anaerobic modes of energy supply differ in the mechanism of action, sources, duration and power (For many years, the question of determining the effectiveness of using machine or free weight exercises in bodybuilding, fitness, powerlifting has caused conflicting views among scientists, coaches and athletes (Thus, the main problem of bodybuilding is the lack of physiologically based mechanisms for the ratio of external stimulus indicators and adaptation processes. Another pressing issue at the stage of specialized basic training is the effective combination of training means and load modes because athletes have high level of resistance to power loads. The in-depth study of these problems will allow to improve the training process in bodybuilding.The purpose of this study was to determine the impact of training loads different in intensity and energy supply on performance in bodybuilding; to study the peculiarities of adaptive body changes using machine and free weight exercises at the stage of specialized basic training.