Considerations for racial differences in the athlete's heart
Exercise training is associated with changes in left ventricular morphology commonly referred to as the athlete's heart. The magnitude of these changes appears to be due in part to the type, intensity, and duration of training. Certain athletes develop more marked alterations in left ventricular morphology, however. This raises the consideration of whether the cardiac response to athletic training may also be influenced by genetic or racial factors.
Lewis, J. (1992). Considerations for racial differences in the athlete's heart. Cardiology Clinics, 10 (2). http://dx.doi.org/10.1016/s0733-8651(18)30248-0