Echocardiographic evaluation of cardiovascular system in adolescent athletes in view of physiological adaptation to physical training

Wstęp. Ocena układu krążenia u młodych sportowców pozostaje tematem aktywnych badań. Duże trudności pojawiają się w zakresie oceny wielkości i grubości jam serca ze względu na istotne różnice antropometryczne między poszczególnymi zawodnikami gdzie trening fizyczny (nierzadko bardzo intensywny) nakłada się na okres dojrzewania i szybkiego wzrostu. Celem pracy była ocena wpływu regularnego wysiłku fizycznego na układ krążenia u dorastających sportowców. Materiał i metody. W badaniu oceniano 89 sportowców — 41 jeden piłkarzy oraz tenisistów (grupa 1.) oraz 48 rozpoczynających karierę sportową wioślarzy (grupa 2.). U wszystkich kwalifikujących się zawodników wykonano badanie ergospirometryczne z oceną szczytowego pochłaniania tlenu (VO2max) oraz badania elektrokardiograficzne i echokardiograficzne. Wyniki. Porównano sportowców z obu grup, tj. piłkarzy i tenisistów (grupa 1.) z grupą wioślarzy (grupa 2.). Obie grupy nie różniły się wiekiem (14,2 ± 1,1 v. 14,3 ± 1,2 roku; p = NS) oraz płcią (dziewczęta: 6 [7,6%] v. 8 [10,2%]; p = NS]. Dłużej trenujący piłkarze i tenisiści, w porównaniu z grupą wioślarzy, różnili się pod względem parametrów antropometrycznych, parametrów wydolności fizycznej oraz spoczynkowej częstości rytmu serca. Większość wymiarów jam serca indeksowanych względem pola powierzchni ciała była większa w grupie osób dłużej trenujących piłkarzy i tenisistów (końcoworozkurczowy wymiar lewej komory: 29,1 ± 2,5 v. 26,8 ± 2,7 mm/m2; p < 0,001; grubość przegrody międzykomorowej: 6,0 ± 0,7 v. 5,4 ± 0,8 mm; p = 0,001; grubość ściany tylnej: 0,8 ± 0,6 v. 5,2 ± 0,6; p < 0,001; proksymalny fragment drogi odpływu prawej komory: 16,1 ± 2,2 v. 14,5 ± 2,0 mm/m2; p = 0,001; wymiar drogi napływu prawej komory: 19,9 ± 2,1 v. 18,5 ± 2,6 mm/m2; p = 0,01). Po zastosowaniu indeksacji allometrycznej większość oberwanych różnic przestała mieć znaczenie istotne statystycznie, z wyjątkiem indeksowanej masy lewej komory (87,0 ± 13,9 v. 76,8 ± 12,2 g/(m2)1,5; p = 0,001). Wnioski. 1. Zastosowanie indeksacji allometrycznej w stosunku do parametrów echokardiograficznych u dorastających sportowców wydaje się właściwe ze względu na nieliniową zależność pomiędzy tempem wzrostu, a szybkością zwiększania się narządów wewnętrznych w tej grupie wiekowej. 2. Nawet krótki trening fizyczny u dorastających sportowców ma istotny wpływ na poprawę parametrów wydolności fizycznej, bez znaczącego wpływu na większość parametrów morfologicznych serca.Introduction. Assessment of cardiovascular system in young athletes is a subject of active research. Cardiac morphology is difficult to evaluate due to significant anthropometric differences between individuals, especially during puberty and growth spurt. The aim of this paper was an assessment of systematic physical training’s impact on cardiovascular system and cardiac remodeling in young athletes. Material and methods. Study involved 89 adolescent athletes, including 41 football players and tennis players (group 1) and 48 beginner rowers (group 2). All athletes included in the study underwent ergospirometric tests with evaluation of peak oxygen uptake (VO2max) as well as a 12-lead electrocardiographic and echocardiographic evaluation. Results. Athletes in group 1 (football/tennis players) were compared to group 2 (rowers). There were no significant differences in age (14.2 ± 1.1 vs. 14.3 ± 1.2 years, p = NS) or sex (6 [7.6%] vs. 8 women [10.2%], respectively, p = NS). Differences were observed in anthropometric parameters, cardiopulmonary fitness, and resting heart rate. Most parameters of cardiac morphology indexed to body area (indexed value: raw data/bodu surface area) were greater in group 1 (left ventricular end-diastolic dimension 29.1 ± 2.5 vs. 26.8 ± 2.7 mm/m2, p < 0.001; septal thickness: 6.0 ± 0.7 vs. 5.4 ± 0.8 mm, p = 0.001; posterior wall thickness: 0.8 ± 0.6 vs. 5.2 ± 0.6, p < 0.001; proximal part of right ventricle outflow tract: 16.1 ± 2.2 vs. 14.5 ± 2.0 mm/m2, p = 0.001; right ventricle inflow tract: 19.9 ± 2.1 vs. 18.5 ± 2.6 mm/m2, p = 0.01). When allometric scaling was employed, most differences were insignificant, apart from indexed left ventricle mass (87.0 ± 13.9 vs. 76.8 ± 12.2 g/(m2)1.5, p = 0.001). Conclusions. 1. Allometric indexation of echocardiographic parameters in young athletes is appropriate since relationship between body height increase and the rate of internal organ growth in these subjects is non-linear. 2. Even a short physical training in young athletes has impact on their condition but does not significantly affect parameters of cardiac morphology

Static Postural Balance in Modern Pentathletes: A Pilot Study

Postural balance is a key element of shooting effectiveness, which determines the outcome of modern pentathlon competitions. The aim of the study is to examine the postural balance of 27 pentathletes (12 females and 15 males; mean age: 18.0 ± 1.8 years), and 26 physically active, untrained subjects (12 females and 14 males; mean age: 22.5 ± 1.4 years), and to investigate the impact of footwear on the stability of the shooting position in pentathletes. Methods: Static postural balance was examined during quiet stance in four test conditions (standing in footwear with eyes opened, standing in footwear with eyes closed, standing barefoot with eyes opened, and standing barefoot with eyes closed). During each postural balance measurement, the participant remained still on the platform, with their arms in front of their body. Postural balance in the shooting position was only evaluated in the group of pentathletes. The athlete was asked to assume a comfortable shooting position on the platform and to aim at the target. Standard pentathlon targets and pistols were used in the study. Measurements were carried out twice (barefoot and in footwear). Results: In all conditions, pentathletes achieved lower values of posturographic measures than in the control group. In non-visual conditions, measures describing the surface area of the centre of pressure decreased in pentathletes and increased in the control group. Both pentathletes and non-athletes were equally stable barefoot as in footwear. Footwear did not affect postural sway in the shooting position in pentathletes. Conclusions: Pentathletes were found to have significantly better stance stability and were less vision-dependent in postural balance than untrained subjects. Bearing in mind that the shooting position of pentathletes was as stable barefoot as in footwear, the main factors which were most likely responsible for minimising body oscillations in the pentathletes were their high level of concentration and conscious control of body alignment

Table1_Below or all the way to the peak? Oxygen uptake efficiency slope as the index of cardiorespiratory response to exercise—the NOODLE study.DOCX

Background: The ratio of oxygen uptake (VO2) to minute ventilation (VE) is described as the oxygen uptake efficiency slope (OUES). OUES has been suggested as a valuable submaximal cardiorespiratory index; however, its characteristics in endurance athletes remain unknown. In this study, we a) investigated OUES between different time intervals, b) assessed their prediction power for VO2peak, and c) derived new prediction equations for OUES tailored for well-trained individuals.Materials and Methods: A total of 77 male (age = 21.4 ± 4.8 yrs; BMI = 22.1 ± 1.6 kg·m−2; peak oxygen uptake = 4.40 ± 0.64 L·min−1) and 63 female individuals (age = 23.4 ± 4.3 yrs; BMI = 23.1 ± 1.6 kg·m−2; peak oxygen uptake = 3.21 ± 0.48 L·min−1) underwent the cycling cardiopulmonary exercise test. OUES was measured at 75%, 90%, and 100% of exercise duration. Prediction power and new models were derived with the multiple linear regression method.Results: In male subjects, OUES [mL·min−1/L·min−1] from 75% = 4.53 ± 0.90, from 90% = 4.52 ± 0.91, and from 100% = 4.41 ± 0.87. In female subjects, OUES [mL·min−1/L·min−1] from 75% = 3.50 ± 0.65, from 90% = 3.49 ± 0.62, and from 100% = 3.41 ± 0.58. OUES did not differ between time intervals in male (p = 0.65) and female individuals (p = 0.69). OUES strongly predicts peak VO2 independently from the measuring interval (β = 0.71–0.80; R2 = 0.50–0.63). The prediction model designed for elite athletes was OUES [mL·min−1/L·min−1] = −1.54 + 2.99; BSA [m2]—0.0014; (age [in years]; sex [1 = male, 2 = female]) (R2 = 0.36).Conclusion: OUES enables an accurate prediction of peak cardiorespiratory fitness in elite endurance athletes. OUES is a feasible alternative to maximal exercise testing. A new prediction equation should be used for highly trained individuals. Physicians should understand OUES physiology to properly assess the cardiorespiratory response to exercise in athletic cohorts.</p