Rapid ventricular filling in left ventricular hypertrophy: I. Physiologic hypertrophy

Area of Science:

• Cardiology
• Sports Medicine
• Physiology

Background:

• Endurance training induces cardiac adaptations, including left ventricular hypertrophy.
• The impact of this physiologic hypertrophy on diastolic function remains a key area of investigation.

Purpose of the Study:

• To investigate the effects of endurance training on left ventricular diastolic properties.
• To compare left ventricular filling rates between endurance athletes and sedentary individuals.

Main Methods:

• Echocardiography was used to assess left ventricular dimensions, wall thickness, and mass.
• A scintillation probe measured average left ventricular filling rates.
• Maximal oxygen consumption and electrocardiographic voltage were also compared.

Main Results:

• Athletes exhibited significantly higher maximal oxygen consumption and electrocardiographic voltage.
• Physiologic left ventricular hypertrophy was observed in athletes compared to controls.
• Despite hypertrophy, left ventricular filling rates were similar between athletes and controls.

Conclusions:

• Physiologic left ventricular hypertrophy due to endurance training does not impair diastolic filling.
• This finding differentiates it from pathologic hypertrophy, which is linked to diastolic dysfunction.