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[[File:HeartRateSimplified.png|right|thumb|500px|A simplified chart of heart rate against exercise intensity showing [[Maximum Heart Rate]], [[Heart Rate Reserve]], [[Resting Heart Rate]] and [[Heart Rate Deflection]].]]
Maximum heart rate (HR<sub>max</sub>) is the fastest rate the heart is capable of beating. Like any muscle there is a limit to how fast the heart can contract, and this limits how fast the heart can beat. This maximum heart rate is not a "safe limit", but a physiological limit. It is not possible to exercise and push your heart rate beyond its maximum; if you see your heart rate go higher than the previously recorded maximum all you're doing is redefining what the maximum value is. However, with prolonged exercise (>10 min) [[Heart Rate Drift]] will gradually increase the Maximum Heart Rate<ref name="Wingo-2005"/>.
=Maximum heart rate test=
<ref name="pfitz">Pete Pfitzinger - Lab Reports - Slowing Down With Age http://pfitzinger.com/labreports/age.shtml </ref>
<ref name="surp">"THE SURPRISING HISTORY OF THE HRmax=220-age EQUATION" http://faculty.css.edu/tboone2/asep/Robergs2.pdf</ref>
<ref name="Wingo-2005"> JE. Wingo, AJ. Lafrenz, MS. Ganio, GL. Edwards, KJ. Cureton, Cardiovascular drift is related to reduced maximal oxygen uptake during heat stress., Med Sci Sports Exerc, volume 37, issue 2, pages 248-55, Feb 2005, PMID [http://www.ncbi.nlm.nih.gov/pubmed/15692320 15692320]</ref><ref name="Wingo-2006b"> JE. Wingo, KJ. Cureton, Maximal oxygen uptake after attenuation of cardiovascular drift during heat stress., Aviat Space Environ Med, volume 77, issue 7, pages 687-94, Jul 2006, PMID [http://www.ncbi.nlm.nih.gov/pubmed/16856352 16856352]</ref>
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