Superior cardiac mechanics without structural adaptations in pre-adolescent soccer players.

AIMS

This study aimed to evaluate left ventricular structure, function and mechanics, in highly-trained, pre-adolescent soccer players compared with age- and sex-matched controls.

DESIGN

The study design was a prospective, cross-sectional comparison of left ventricular structure, function and mechanics.

METHODS

Twenty-two male soccer players from two professional youth soccer academies (age: 12.0 ± 0.3 years) and 22 recreationally active controls (age: 11.7 ± 0.3 years) were recruited. Two-dimensional conventional and speckle tracking echocardiography were used to quantify left ventricular structure, function and peak/temporal values for left ventricular strain and twist, respectively.

RESULTS

End-diastolic volume index was larger in soccer players (51 ± 8 mm/(m). 45 ± 6 mm/(m);  = 0.007) and concentricity was lower in soccer players (4.3 ± 0.7 g/(mL). 4.9 ± 1.0 g/(mL);  = 0.017), without differences in mean wall thickness between groups (6.0 ± 0.4 mm . 6.1 ± 0.5 mm;  = 0.754). Peak circumferential strain at the base (-22.2% ± 2.5% . -20.5% ± 2.5%;  = 0.029) and papillary muscle levels (-20.1% ± 1.5% . -18.3% ± 2.5%;  = 0.007) were greater in soccer players. Peak left ventricular twist was larger in soccer players (16.92° ± 7.55° . 12.34° ± 4.99°;  = 0.035) and longitudinal early diastolic strain rate was greater in soccer players (2.22 ± 0.40 s. 2.02 ± 0.46 s;  = 0.025).

CONCLUSIONS

Highly-trained soccer players demonstrated augmented cardiac mechanics with greater circumferential strains, twist and faster diastolic lengthening in the absence of differences in wall thickness between soccer players and controls.