Exercise training during childhood and adolescence is associated with favorable diastolic function in hypertrophic cardiomyopathy.

BACKGROUND

Diastolic dysfunction is an important part of the clinical phenotype in hypertrophic cardiomyopathy (HCM). While exercise training is known to improve left ventricular (LV) diastolic function in normal hearts, the effects of exercise training during childhood and adolescence in carriers of HCM-associated genetic variants are unknown.

METHODS

In a cross-sectional and retrospective study, we combined clinical and echocardiographic data with history of exercise training from childhood to time of examination in 187 participants with HCM or an HCM-causative genotype. Multiple linear regression was used to identify correlations between exercise training performed prior to 20 years of age and LV diastolic parameters from echocardiography.

RESULTS

Exercise training during childhood and adolescence was correlated with a favorable e', E/e', E deceleration time, and end-diastolic volume (EDV), when adjusting for the effects of age at examination, and presence of left ventricular hypertrophy (LVH). This correlation was evident both in patients with a HCM phenotype (HCM LVH+), and in individuals with an HCM-causative genotype without LV hypertrophy (G+ LVH-). None of the diastolic parameters correlated unfavorably with increasing exercise exposure.

CONCLUSION

More exercise training during childhood and adolescence was associated with favorable LV diastolic function in both HCM LVH+ and G+ LVH- groups, regardless of presence of hypertrophy at the time of examination. These results indicate that exercise training initiated during childhood and adolescence has positive effects on cardiac function later in life for individuals with HCM or an HCM-causative genotype.