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{{DISPLAYTITLE:Heart Rate Reserve (HRR)}}
[[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]].]]
Heart Rate Reserve is a how much your [[Heart Rate]] can speed up with exercise. It's the difference between the fastest heart rate ([[Maximum Heart Rate]]) and the slowest ([[Resting Heart Rate]].) =Calculating Percent Heart Rate Reserve=Heart Rate Reserve (HRR) is normally calculated as the difference between your [[Maximum Heart Rate]] (HR<sub>max</sub>) and [[Resting Heart Rate]] (HR<sub>rest</sub>). Exercise intensity can be evaluated by calculating your heart rate as a percentage of HRR. The calculation to work out %HRR is is… %HRR = (HR<sub>ex</sub> – HR<sub>rest</sub>)/(HR<sub>max</sub> – HR<sub>rest</sub>), where Where HR<sub>ex</sub> is the exercise [[Heart Rate]]. So For example, for a HR<sub>max</sub> of 180, a HR<sub>rest</sub> of 40 and HR<sub>ex</sub> of 140 would be (140 – 40)/(180 – 40), which is 71%. =Why use Percentage Heart Rate Reserve? =Using %HRR is better than a percentage of HR<sub>max</sub>, as it reflects the relative intensity more accurately. For example, if two athletes both have a HR<sub>max</sub> of 180, but one has a HR<sub>rest</sub> of 40 and the other 70, at a HR of 140 they would both have the same %HR<sub>max</sub>, but one is at 64 %HRR and the other is at 71 %HRR. =Issues with Percentage Heart Rate Reserve=While HRR is a good way of looking at effort and intensity, but there are two issues to be aware of.
# For HRR to be of value, you have to test your HR<sub>max</sub>, as it '''cannot''' be calculated. Calculating HR<sub>max</sub> is a mistake that can lead to misleading views of effort.
# I believe we should use the [[Orthostatic Heart Rate]] (HR<sub>orth</sub>)which is the [[Heart Rate]] when standing rather than HR<sub>rest</sub>, as HR<sub>orth</sub> is typically 10-15 beats higher than HR<sub>rest</sub>, which is enough to skew the relative effort percentage.
