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# 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.
Most [[Heart Rate Monitor]]s will display your %HRR if you input your HR<sub>max</sub> and HR<sub>rest</sub>.
=%HRR, %[[VO2max|V̇O2max]], and [[VO2max|V̇O2max]] Reserve=
Just as %HRR is the percentage of the difference between resting and max heart rate, so [[VO2max|V̇O<sub>2</sub>max]] Reserve is the difference between resting V̇O<sub>2</sub> and [[VO2max|V̇O2max]]. If you need to convert %HRR to %[[VO2max|V̇O<sub>2</sub>max]], there's some correlation (r=0.78<ref name="Solheim-">), and you can use this formula to get a rough estimate<ref name="SwainLeutholtz1997"/>:
%[[VO2max|V̇O<sub>2</sub>max]] = %HRR x 1.12 – 12
So, if you're at 60% of HRR, that's (60 x 1.12) – 12 = 55% [[VO2max|V̇O<sub>2</sub>max]].
=See Also=
* [[Maximum Heart Rate]]
* [[Pulse Oximeter]]
* [[Heart Rate Deflection]]
=References=
<references>
<ref name="SwainLeutholtz1997">David P. Swain, Brian C. Leutholtz, Heart rate reserve is equivalent to%??VO2Reserve, not to%??VO2max, Medicine & Science in Sports & Exercise, volume 29, issue 3, 1997, pages 410–414, ISSN [http://www.worldcat.org/issn/0195-9131 0195-9131], doi [http://dx.doi.org/10.1097/00005768-199703000-00018 10.1097/00005768-199703000-00018]</ref>
<ref name="Solheim-">TJ. Solheim, BG. Keller, CJ. Fountaine, VO, Int J Exerc Sci, volume 7, issue 4, pages 311-317, PMID [http://www.ncbi.nlm.nih.gov/pubmed/27182409 27182409]</ref>
</references>
