(1) Walking [appropriate for speeds of 50 to 100 m/min (1.9 to 3.7 mile/h) or higher if the individual is truly walking]
R = 3.5 ml/kg/min = 1 MET
H = 0.1¡Ñwalking speed (in m/min)
V = 1.8¡Ñspeed (in m/min)¡Ñgrade (as a decimal)
For example, 5% grade is written as 0.05 in this format. If the grade is 0%, it means that V = 0.
=> VO2 (in ml/kg/min) = R¡ÏH¡ÏV

(2) Running (appropriate for speeds > 134 m/min or 5.0 mile/h. This equation can also be used for speeds between 3 and 5 mile/min if the individual is truly running)
R = 3.5 ml/kg/min
H = 0.2¡Ñrunning speed (in m/min)
V = 0.9¡Ñspeed (in m/min)¡Ñgrade (as a decimal)
For running on a level treadmill or for outdoor running that begins and ends at the same point, V = 0. (This equation should not be used for overground running up or down grades)
=> VO2 (in ml/kg/min) = R¡ÏH¡ÏV

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