Frequent exercise doesn't just strengthen the heart – it also changes the nerves that control it, according to new research ...

Your heart’s job is to keep your pulse steady to pump blood throughout your body. Sometimes your heart rate is slower when you’re relaxing, and sometimes it’s faster when you’re exercising or stressed ...

A rat study has found that aerobic exercise may reshape nerves that control the heart. However, the impact was not the same ...

In TODAY.com's Expert Tip of the Day, a cardiologist explains how to slow down a racing heart in times of stress.

Dr. Myerburg answers the question: 'How Do Pacemakers Know To Pace Faster?' — -- Question: How do pacemakers know when I need a faster heart rate, for example when I am exercising or anxious?

Study reveals digoxin improves heart pump function and helps ease heart failure and atrial fibrillation symptoms.