Validation of Maximal, Submaximal, and Nonexercise Indirect [Formula: see text]Omax Estimations at 2600 m Altitude.

To study the criterion validity of three indirect maximal oxygen uptake ([Formula: see text]Omax) assessment equations at altitude. We studied 64 young adults (53% men) at Bogota, Colombia (2600 m altitude). Direct [Formula: see text]Omax was measured by indirect calorimetry using a maximal incremental treadmill protocol.