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=Why %HRR rather than %HR<sub>max</sub>=
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 HR<sub>ex</sub> of 140would be same %HR<sub>max</sub>, but one is at 64 %HRR and the other is at 71 %HRR.
=Estimating percent [[VO2max|V̇O<sub>2</sub>max]]=
It is possible to estimate the percent of [[VO2max|V̇O<sub>2</sub>max]] from the percent of HRR using the formula
%[[VO2max|V̇O<sub>2</sub>max]] = (%MHR - 37) / 0.64
=See Also=