The purpose of this Review is to Describe VO2 max and analyze the contemporary research available in VO2 max measurements carried out in all Populations and includes Direct method (Laboratory method) and Indirect methods (Field test) for VO2 max estimation.There are no such review in literature which describes all the direct and indirect methods at one plot. The VO2 max can be estimated using direct or indirect methods. VO2 max is expressed as liters/min as an absolute value or in milliliters /kg/min as relative VO2 max. VO2 max is the maximum amount of oxygen a person can intake and the value does not change despite an increase in workload over time period. The maximal oxygen consumption attained during a graded maximal exercise to voluntary exhaustion has long since been considered by the World Health Organization as the single best indicator of cardio respiratory fitness.
