By: Dr. Bill Misner Ph.D.
One common question from endurance athletes is why is my heart rate so high, so low, or varying in such-and-such a manner. Even experienced Cardiologists are not always able to define heart rate variations. When a heart rate is slowed, speeds up, or varies inexplicably, there
are a number of mechanisms to consider. This article considers only a few of them as it would take volumes to describe every instance in which the heart is called to vary its rate in response to specific life-support demands.
This paper reviews the science of slow heart rate, fast heart rate, the athletic heart syndrome, differences in between athletes and non-athletes, and a few of the numerous changes in heart rate frequency response.