Get to know the link between your effort level and your heart rate. Plus, how to use heart rate to your performance advantage ...

Your heart works harder to send blood to your stomach for digestion when you eat. Your heart rate may also spike after eating certain foods high in sugar, carbs, salt, or hot spice. Heart Palpitations ...

In this setting, the atrial rate (P waves) and ventricular rate (QRS complexes) are at different heart rates. One quick and easy way to measure the ventricular rate is to examine the RR interval ...