Athlete's Heart: Why Do Athletes' Hearts Grow Bigger?
- Mar 30
- 8 min read
Updated: Apr 8
Regular and intense physical training leads to significant physiological adaptations in the cardiovascular system. In sports cardiology , the term "athlete's heart" is used to describe the structural and functional changes that develop in the heart as a result of prolonged exercise. This is not a disease, but rather a physiological restructuring of the heart to adapt to increased physical strain .
During exercise, the oxygen demand of muscles increases. To meet this demand, the heart has to pump more blood. As a result of prolonged training, changes occur in the heart such as enlargement of the ventricular chambers, increase in myocardial wall thickness, and growth in heart mass . These adaptations support exercise performance by increasing the amount of blood the heart pumps with each beat, i.e., stroke volume .
However, some structural changes seen in the heart of athletes can resemble early signs of serious heart diseases such as hypertrophic cardiomyopathy or arrhythmogenic cardiomyopathy. Therefore, distinguishing whether the changes observed in the heart of athletes are a physiological adaptation or a symptom of an underlying heart disease is one of the most important issues in sports cardiology.
