Associate Professor Morozova E.V.¹
Dr. Biol., Professor Zavalishina S.Yu.²
Dr. Hab., Associate Professor Makhov A.S.^1
1Federal State Budgetary Educational Institution of Inclusive Higher Education "Moscow State University of Humanities and Economics", Moscow
²Russian State Social University, Moscow

Keywords: sports, volleyball, heart, motor activity, physical activity.

Introduction. Intense muscle activity, including during any sports training, activates the entire body [1]. Prolonged weak physical activity is very harmful, as it leads to the development of many variants of pathology [2]. For this reason, it seems necessary to continue to clarify the dynamics of cardiac parameters during sports training.
The aim of the study was to evaluate cardiac parameters in young volleyball players.
Methodology and organization of the study. The observation was performed on 22 clinically healthy volleyball players of youth age (18-19 years old) with at least two years of sports experience. The control group included 24 clinically healthy young men who were not involved in sports activities. Ultrasound examinations of the heart were performed in all young men using the SSD-80 Aloka unit (Japan).
The results of the study and their discussion. The differences of the monitored parameters in the control groups and volleyball players were established. The greatest differences between the observed groups were in the state of morphological characteristics of the walls of the left ventricular myocardium. The value of myocardial mass in athletes was 18.9% higher than the control values. The size of the diameter of the left atrium and left ventricle during diastole in physically trained people tended to prevail over the control values. The rate of myocardial relaxation in the posterior part of the left ventricle in athletes exceeded the control value by 26.6%. The thickness during diastole of the posterior wall of the left ventricle in volleyball players was 14.2% higher than that in the control. The final diastolic volume of the volleyball players was 9.6% lower than the control volume. However, the impact volume in both observed groups did not differ from each other. The small value of the ratio of diastolic final volume to myocardial mass in volleyball players (0.67±0.12) was a consequence of the prevalence of hypertrophy phenomena over the manifestations of the dilation process.
Conclusion. Systematic volleyball classes ensure the development of the walls of the left ventricle in young men while maintaining an optimum volume of its cavity and its contractility.

Literature

1. Medvedev I.N. Functional features of the heart in young basketball players / I.N. Medvedev, A.S. Makhov // Teoriya i praktika fizicheskoj kultury. 2022. No. 4. p. 45.
2. Vorobyova N.V. Functional capabilities of the heart in basketball players / N.V. Vorobyova, I.I. Fayzullina, V.I. Sharagin et al. // Teoriya i praktika fizicheskoj kultury. 2023. No. 7. pp. 34-35.