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?

Our hearts beat faster when we exercise, which is why heart rate training can be so useful. But when we aren’t doing anything, our heart rate can still be useful to know. If you have a wearable that ...