Which of the following is NOT a requirement for determining a true VO2max?

The assessment of maximal oxygen uptake, or VO2max, is crucial in evaluating an individual’s aerobic capacity and cardiovascular fitness. To determine whether an individual has reached a true VO2max, certain physiological criteria must be met.

A plateau in oxygen uptake signifies that as exercise intensity continues to increase, oxygen consumption no longer rises. This indicates the individual has reached their maximal ability to consume oxygen. Max heart rate being reached typically demonstrates that the cardiovascular system is maximally engaged. Volitional exhaustion indicates that the individual has exerted themselves to the point where they can no longer continue, ensuring that the test captures the individual’s true capacity.

The respiratory exchange ratio (RER) typically assesses the ratio of carbon dioxide produced to oxygen consumed. An RER greater than 0.85 is common during high-intensity exercise, but it is not an absolute requirement for defining a true VO2max. Some individuals may reach their maximal oxygen uptake without achieving this specific RER threshold. Therefore, while it can be indicative of maximal effort, it does not serve as a strict criterion for determining whether a true VO2max has been achieved.