As exercise intensity increases the heart beats faster, and it's relatively easy to measure heart rate while exercising. This makes heart rate a simple way of evaluating exercise intensity, but you need to understand a couple of common issues to use it effectively.
- 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 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 Heart Rate Drift.