Related to:
Oct. 11 2013 12:00 AM

When we think of cardiovascular health, physical activity - such as running - often comes to mind. But new research shows that running a marathon can prompt heart muscle changes that cause the heart to swell, and this is particularly the case in runners with lower fitness levels.



Continued at MedicalNewsToday>>

Follow  

What is your average annual income for your fitness-related work/business?