What is sinus braydicardia?

Sinus bradycardia is a condition characterized by a slow heart rate. It is defined as a heart rate of less than 60 beats per minute (bpm) in adults. Sinus bradycardia is usually caused by increased vagal tone, which is the activity of the vagus nerve, a nerve that controls the heart rate. It is commonly seen in athletes and healthy young adults, and is generally not a cause for concern. However, if sinus bradycardia is accompanied by symptoms such as dizziness, fainting, or shortness of breath, it is important to see a doctor to rule out any underlying medical conditions.