Exercise-Induced Left Ventricular Remodeling Among Competitive Athletes: A Phasic Phenomenon

Area of Science:

• Cardiovascular Physiology
• Sports Cardiology
• Exercise Science

Background:

• Current understanding of exercise-induced cardiac remodeling relies on limited data.
• The temporal progression of cardiac adaptations to exercise is not fully understood.

Purpose of the Study:

• To investigate the temporal progression of cardiac remodeling in endurance athletes.
• To differentiate between acute and chronic adaptations to endurance exercise training.

Main Methods:

• Longitudinal study design with 2D and speckle-tracking echocardiography.
• Examined competitive male rowers (n=12) over 39 months, including an acute augmentation phase (90 days).

Main Results:

• Acute phase (90 days): Left ventricular (LV) mass increased due to LV dilation, with stable wall thickness. Early diastolic function improved.
• Chronic phase (39 months): LV mass further increased, driven by LV wall thickening with stable LV volumes. Early diastolic function remained elevated.

Conclusions:

• Exercise-induced cardiac remodeling is a phased process: acute phase shows chamber dilation and functional improvement, chronic phase shows wall thickening.
• Training duration influences cardiac remodeling, impacting the assessment of myocardial structure and function in athletes.