The paper presents the results of studying the peculiarities of changes in body circumference in 18-20 year-old men in the course of practicing power fitness for one mesocycle in the conditions of using exercise modes that are different in terms of muscle activity. Material and methods. In the course of the study, the participants (50 men) were divided into 2 groups (control and main). Thus, the representatives of the control group used in the process of training the generally accepted mode of heavy workload and low intensity in power fitness (Ra = 0.53). In the process of training, men of the main group used the experimental mode of loads of low workload and high intensity developed by us (Ra = 0.72). Reducing the duration of recovery periods between sets by 30% compared with the generally accepted regimes in power fitness, increasing the duration of the concentric and eccentric movement phases almost by half, while reducing the number of repetitions in a separate set by almost 50%, significantly affected the duration of tense muscular activities in a separate set, the magnitude of the indicators of the working mass load and the volume of load in the working set. Results and discussion. Investigating the features of changes in the average group parameters of the body circumference of the examined contingent within 3 months of practicing power fitness in the conditions of applying different load modes in terms of volume and intensity, we found a significant difference between the results. The main group representatives used quite short (about 40 s) and at the same time unusual for power fitness rest intervals between sets, which influenced the mode of muscular activity and the change in volume and intensity indicators, contributed to a more pronounced increase in the average group body circumference by almost 2.5 times compared with the results fixed in the men of the control group. The obtained results showed that the greatest increase was in the studied parameters by 7.5% (p <0.05) compared to the baseline when monitoring the dynamics of the shoulder circumference of the main group after the first 45 days of using it in the process of exercising a high-intensity load mode (Ra = 0.72). At the same time, controlling the change in the parameters of the hip circumference among the control group during the last 45 days of research, there was not any positive trend. The corresponding changes indicated that, regardless of the features of the training programs and training load regimes, the most pronounced adaptation changes in the body of 18-20 year-old men practicing power fitness lasted no more than 45 days. This fact indicates the need for a constant change in the value of load indicators. Conclusions. Thus, the research proved that it was the use of the experimental mode of exercise in the process of practicing power fitness that contributes to more pronounced adaptation changes in the body of the representatives of the main group due to the growth of muscle mass and, accordingly, body circumference.
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