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[[File:HeartRateSimplified.svg|right|thumb|500px|A simplified chart of heart rate against exercise intensity showing [[Maximum Heart Rate]], [[Heart Rate Reserve]], [[Resting Heart Rate]] , [[Orthostatic Heart Rate]], and [[Heart Rate Deflection]].]]
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]].
=See AlsoThe Heart Rate to Effort Relationship=There are several aspects to the relationship between heart rate and effort (power output.)* [[Maximum Resting Heart Rate]](HR<sub>rest</sub>) is how fast your heart beats when you are not expending any energy beyond simply being alive. There's also "Zero Power Heart Rate" which is when you're standing or sitting on a bike without any other exertion. * [[Orthostatic Heart Rate]] (HR<sub>orth</sub>) is the heart rate when standing, and is typically 10-15 BPM higher than HR<sub>rest</sub>. I think of this as "Zero Power Heart Rate." The difference from resting is part of the [[Orthostatic Heart Rate ReserveTest]].* [[Heart Rate ReserveDeflection]]* . Heart rate is generally considered to be linear with effort (power output) up to about 80% of Maximum Heart Rate, and this deflection is often used to estimate [[Pulse OximeterLactate Threshold]].* [[Maximum Heart Rate Deflection]](HR<sub>max</sub>) is the fastest rate the heart is capable of beating and it must be tested as it cannot be calculated.* [[Heart Rate MonitorReserve]]is the difference between HR<sub>max</sub> and HR<sub>rest</sub>, thought I believe that HR<sub>orth</sub> should be used instead of HR<sub>rest</sub>. It's a better measure of intensity than %HR<sub>max</sub>.
