How do fitness trackers measure your heart rate? The systemic circulation is a major portion of the circulatory system. The network of veins, arteries and blood vessels transports oxygenated blood ...

Here's a diagram of how the index works ... speed that you theoretically "should" have run based on your average heart rate. If the actual speed is faster than the predicted speed, it suggested ...

A considerable body of evidence indicates that elevated resting heart rate is an independent, modifiable risk factor for cardiovascular events and mortality in patients with coronary artery disease.

is the volume of blood pumped out of each ventricle each time the heart beats Heart rate close heart rateThe number of heart beats per minute. is the number of beats per minute and is the same as ...