Scientists are using small, laboratory-grown heart tissues to investigate why strenuous exercise can temporarily change heart ...

A patient’s cells are revealing new clues about a serious heart condition—and could reshape how scientists test treatments.

The heart is the body's hardest-working muscle. Whether you're awake or asleep, or exercising or resting, your heart is always at work. It pumps blood through arteries to deliver oxygen to organs and ...

Dehydration can affect much more than your thirst. It also can place extra stress on your heart and cardiovascular system, explains Dr. Brodie Marthaler, a cardiologist at Mayo Clinic Health System in ...