Aim. Analysis of genetic markers of physical performance and their interrelation with electrocardiographic parameters in athletes of the youth league.Methods. The study involved 204 of adolescent athletes. EKGs were performed, the profile of genes of folate cycle and genes encoding the function of angiotensin-converting enzyme was detected by polymerase chain reaction in venous blood.Results. It was found that all participants had sinus rhythm. Arrhythmias and conduction disorders were revealed: bradycardia was observed in 22 (10.7%) of participants, normocardia - in 168 (82%) participants, tachycardia - in 14 (6.8%) participants, incomplete right and left bundle branch block - in 16 (7.7%) participants, and repolarization disorders of left ventricle - in 5 (2.4%) young athletes. The genes polymorphism of folate cycle and genes encoding the function of angiotensin-converting enzyme in the examined individuals were presented in different variants. Majority of the participants had heterozygous forms in most genes except for the gene NOS3 894 G>T presented as a dominant form.Conclusion. Accordng to EKG the athletes of the youth league had early repolarization of the left ventricle (2.4% cases), incomplete right or left bundle branch block (7.7% cases), and normal waves and intervals; according to genetic study most participants had heterozygous genotype GNB3 825 C>T, NOS3-786 T>C, AGT 704 T>C, negative correlation of QTc with NOS3-786 T>C and NOS3 894 G>T, α-angle / AGT 704 T>C with P-wave / NOS3 894 G>T.
Aim. The article deals with establishing the peculiarities of ECG contour analysis in athletes with various SERPINE1 (PAI-1) genotypes depending on their gender. Materials and methods. We examined 200 athletes from national teams, including 107 boys aged 14.95 ± 1.57 and 93 girls aged 15.04 ± 1.67. ECG registration was performed in standard conditions using SENSITEG 1003 equipment. SERPINE1 PAI-1 gene mutation was assessed with the help of polymerase chain reaction using REALTIME DNA-technologies. We processed the results of the study using SPSS integrated statistical system. Results. We revealed that 44.1% and 55.1% of female and male athletes, respectively, possess SERPINE1 (PAI-1) gene heterozygous form. Dominant genotype was revealed in 23.7% and 33.6% of female and male athletes, respectively, while recessive genotype was found in 32.3% and 11.2% of female and male participants, respectively. Prolonged QRS, P intervals, associated with SERPINE1 (PAI-1) recessive genotype, are more typical for male participants (7-10%). Decreased HR and alpha angle values in persons with recessive genotype are 1.7 and 2.7 times more common for female athletes. Conclusion. We revealed electrocardiographic indicators, associated with SERPINE1 (PAI-1) gene mutation in young athletes. These indicators are significant for the assessment of cardiovascular disease risks. It was established that persons with SERPINE1 (PAI-1) 4G/4G genotype can practice professional sports only under the supervision of a cardiologist.
Success of adaptive changes in young athletes in response to training and competition loads is predicted on the basis of a comprehensive assessment of quantitative and qualitative parameters of the state of critical body systems, primarily, the cardiovascular system. The aim of this paper was to determine sex- and age-related features of the morphofunctional parameters of the heart in young skaters and to identify the relationships that determine their adaptation to speed skating. Materials and methods. The research (with informed consent) included 49 athletes of both sexes with the rank of the First-Class Sportsman. The subjects were divided by age and sex into four subgroups: boys aged 13–15 and 16–18 years; girls aged 13–15 and 16–18 years. We performed electrocardiogram (ECG) recording and echocardiographic examination at rest in line with the existing protocols. Results. According to the screening of intra-system correlations between ECG and echocardiography contour analysis parameters, the following proved to be of prognostic significance: QT interval duration, heart rate and alpha angle for girls aged 13–15 years; duration of atrial excitation and pulmonary artery diameter for boys aged 13–15 years; ejection fraction and cardiac cycle duration for girls aged 16–18 years; duration of atrial excitation, which has four correlations with echocardiographic parameters, for boys aged 16–18 years. The revealed features of the structure of intra-system relationships between 21 morphofunctional parameters of the cardiovascular system are determined in the first age group (13–15 years) by athlete’s sex, while in the second age group (16–18 years) by sex and type of sport. For citation: Yarysheva V.B., Shibkova D.Z., Bayguzhin P.A., Erlikh V.V. Sex- and Age-Related Features of Interrelations Between Structural and Functional Parameters of the Heart in Junior Speed Skaters. Journal of Medical and Biological Research, 2021, vol. 9, no. 4, pp. 405–416. DOI: 10.37482/2687-1491-Z078
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