physiological cardiac dilatation
Normal adaptive enlargement of heart chambers in response to endurance training, distinct from pathological dilatation.
Full Definition
An adaptive increase in cardiac chamber size that occurs in response to chronic endurance exercise training, representing a normal physiological adaptation rather than disease. This enlargement, particularly of the left ventricle and left atrium, allows for increased stroke volume and cardiac output during exercise. The dilatation is accompanied by proportional wall thickening and maintained or enhanced systolic function. Distinguishing this benign adaptation from pathological conditions like dilated cardiomyopathy requires careful assessment of family history, symptoms, exercise performance, and advanced imaging techniques.
Usage
Usage note: Must be distinguished from pathological causes; often requires serial monitoring.
In Context
- "The swimmer's echocardiogram showed physiological cardiac dilatation consistent with training adaptations." — Imaging report
- "Distinguishing physiological cardiac dilatation from early cardiomyopathy required detailed family history and genetic testing." — Diagnostic workup