Changes

As exercise intensity increases the heart beats faster, and it's relatively easy to measure heart rate while exercising. This makes heart rate an ideal a simple, but somewhat flawed way of evaluating exercise intensity. There are a couple of major problems with using Heart Rate to establish training intensities. * Exercise heart rate should be evaluated as a percentage of [[Heart Rate Reserve]]. However, you need to do an individual test to determine [[Maximum Heart Rate]]. Never use a formula to predict Maximum Heart Rate, as these formulas are useless. If you do a Maximum Heart Rate test, then you can calculate your Heart Rate Reserve, which can be used to estimate percentage of exercise intensity.* A second significant problem with Heart Rate Training is that the relationship between Heart Rate and exercise intensity often changes during prolonged exercise, a phenomenon known as [[VO2max|V̇O₂maxHeart Rate Drift]].