You probably were told your resting heart rate at your last checkup. Or maybe you get alerts throughout the day thanks to a fitness tracker or smart watch. But what does the number really mean? And ...

Read on to learn more about resting heart rate including normal resting heart rates based on age, target heart rate zones during activity and red flags to consider, plus causes of an elevated ...

Sinus rhythm (a.k.a. normal sinus rhythm) refers to the normal heart beat originating from the sinoatrial node. This is manifested as an upright P wave in lead II of the ECG. Sinus bradycardia ...