Left atrial and ventricular dimensions in highly trained cyclists

Area of Science:

• Cardiology
• Sports Medicine
• Exercise Physiology

Background:

• Athletic training induces physiological cardiac adaptations.
• Left ventricular remodeling is a key adaptation in endurance athletes.
• Understanding the timeline of remodeling is crucial for athlete health.

Purpose of the Study:

• To investigate the development of left ventricular remodeling in young competitive cyclists.
• To compare cardiac dimensions and function between different levels of cycling experience.
• To assess the progression of cardiac adaptations over an athletic career.

Main Methods:

• Two-dimensional echocardiography was performed on highly trained competitive cyclists (17 years old) and professional cyclists (29 years old).
• Cardiac dimensions, including left atrial and left ventricular diameters and mass, were measured.
• Data were compared between groups and with literature values for untrained individuals.

Main Results:

• Significantly increased left atrial and left ventricular dimensions and mass were observed in professional cyclists compared to younger athletes.
• Both athlete groups showed enlarged cardiac chambers and increased left ventricular mass compared to untrained subjects.
• Early diastolic filling (E-wave) was significantly higher in athletes, indicating enhanced diastolic filling capacity.

Conclusions:

• Left atrial and ventricular remodeling begins early in an athlete's career, evident by age 17.
• Cardiac dilatation and increased left ventricular mass progress with continued athletic training.
• Diastolic function remains normal despite significant structural changes throughout an athlete's career.