M.O. Odintsova¹
Dr. Biol., Professor S.Yu. Zavalishina²
D.A. Ivanov^3
1Astrakhan State Medical University, Astrakhan
²Russian State Social University, Moscow
³Moscow State University of Psychology & Education, Moscow

Keywords: tennis, physical activity, heart, motor activity, physiology.

Introduction. Active muscle activity, provided it is regular and feasible, strengthens the entire body of the trainee due to the intensification of metabolic and biosynthetic processes in it [1]. Of great interest is the dynamics of the parameters of vital organs in young students who have started playing sports [2]. It can be considered relevant to clarify the performance of the youthful heart in conditions of regular tennis loads.
The purpose of the study is to identify the functional parameters of the heart in tennis students.
Methodology and organization of the study. An experimental group of 23 young tennis players, who were 1st‑year students of Russian universities, who have been training regularly for the last 1.5–2 years, and a control group consisting of 15 healthy young first-year students who did not play sports, were formed. An ultrasound assessment of the heart parameters was performed using the SSD‑80 Aloka installation (Japan). The Student's t-test has been determined.
The results of the study and their discussion. The biological preferred changes in the considered parameters of the heart were found in tennis players. These differences in tennis players were primarily related to the characteristics of the parameters of the left ventricle. In athletes, the myocardial mass was 17.6% higher than that in the control. The transverse dimensions of the left atrium and left ventricle in tennis players during diastole tended to prevail over those in control. The rate of relaxation of the left ventricle in the posterior wall of tennis players exceeded it in the control by 24.3%. The thickness of the left ventricular wall during diastole in the trainees was 12.7% higher than in untrained young men. The value of the final diastolic volume in tennis players was lower than the control by 9.2%, while the impact volume did not differ between the two observation groups.
Conclusions. Tennis training, conducted on a regular basis, contributes to the development of the left ventricular myocardium in young men while maintaining an optimum volume of its cavity, the ability to contract and increase the rate of its relaxation.

Literature

1. Medvedev I.N. Functional features of the heart in athletes / I.N. Medvedev, E.S. Kachenkova // Teoriya i praktika fizicheskoj kultury.  2021. No. 8. pp. 20-21.
2. Medvedev I.N. Functional parameters of the heart in melee fighters / I.N. Medvedev, E.N. Latushkina, A.A. Mikhailov, M.V. Eremin // Teoriya i praktika fizicheskoj kultury. 2022. No. 8.  pp. 40-42.