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From Fellrnr.com, Running tips
VO2max
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V̇O<sub>2</sub>max is the maximum (max) volume (V) of oxygen (O<sub>2</sub>) you can use during exercise. Measuring V̇O<sub>2</sub>max requires specialist equipment, but there are many locations with the facilities and the cost is usually under $100. The procedure involves running on a treadmill while wearing a mask to capture your breath. There is a warm up period, and then you run at a reasonably stressful pace while the treadmill gradient is steadily increased until you can't keep going. For most of the test, as the workload increases so does the O<sub>2</sub> you use. However, there will come a point where the increased workload does not have a corresponding increase in O<sub>2</sub> usage. This is the point where you are using as much O<sub>2</sub> as you are capable of and you the increased workload is coming from anaerobic systems. While V̇O<sub>2</sub>max is interesting, it does not include details of [[Running Economy]], so it does not give a complete picture of a runner's capabilities. Arguably, [[VDOT]] is a more useful measure of fitness.
=V̇O<sub>2</sub>max and vV̇O<sub>2</sub>max=
The velocity that is reached at V̇O<sub>2</sub>max is called vV̇O<sub>2</sub>max. An approximation of vV̇O<sub>2</sub>max is the mile race pace, but a more accurate formula is shown below<ref name="Léger-"/>.
vV̇O<sub>2</sub>max = V̇O<sub>2</sub>max /3.5
Where V̇O<sub>2</sub>max is in ml/Kg/min and vV̇O<sub>2</sub>max is in km/hr.
=References=
<references>
<ref name="Léger-">{{Cite journal | last1 = Léger | first1 = L. | last2 = Mercier | first2 = D. | title = Gross energy cost of horizontal treadmill and track running. | journal = Sports Med | volume = 1 | issue = 4 | pages = 270-7 | month = | year = | doi = | PMID = 6390604 }}</ref>
</references>