Editing VO2 max (section)

==Normalization per body mass==
V̇O<sub>2</sub> max is expressed either as an absolute rate in (for example) litres of oxygen per minute (L/min) or as a relative rate in (for example) millilitres of oxygen per kilogram of the body [[mass]] per minute (e.g., mL/(kg·min)). The latter expression is often used to compare the performance of endurance sports athletes. However, V̇O<sub>2</sub> max generally does not vary linearly with body mass, either among individuals within a species or among species, so comparisons of the performance capacities of individuals or species that differ in body size must be done with appropriate statistical procedures, such as [[analysis of covariance]].<ref name=Dlugosz_et_al_2013 />