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[[File:HeartRateSimplified.pngsvg|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]].]]Heart Rate Reserve (HRR) is normally calculated as the difference between your [[Maximum Heart Rate]] (HR_max) and [[Resting Heart Rate]] (HR_rest). Exercise intensity can be evaluated by calculating your heart rate as a percentage of HRR. The calculation to work out %HRR is (HR_ex – HR_rest)/(HR_max – HR_rest), where HR_ex is the exercise Heart Rate. So a HR_max of 180, a HR_rest of 40 and HR_ex of 140 would be (140 – 40)/(180 – 40), which is 71%. Using %HRR is better than a percentage of HR_max, as it reflects the relative intensity more accurately. For example, if two athletes both have a HR_max of 180, but one has a HR_rest of 40 and the other 70, at a HR of 140 they would both have the same %HR_max, but one is at 64 %HRR and the other is at 71 %HRR. HoweverWhile HRR is a good way of looking at effort and intensity, for '''but there are two issues to be aware of. # For HRR to be of value, you have to test your HR_max, as it '''cannot be calculated'''be calculated. Calculating HR_max is a mistake that can lead to misleading views of effort. # I believe we should use the [[Orthostatic Heart Rate]] (HR_orth)which is the [[Heart Rate]] when standing rather than HR_rest, as HR_orth is typically 10-15 beats higher than HR_rest, which is enough to skew the relative effort percentage. Most [[Heart Rate Monitor]]s will display your %HRR if you input your HR_max and HR_rest.