Oregon Scientific Trainer Pro HR318 - Manual (Page 5)

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FITNESS INDEX
Your Smart Trainer / Trainer Pro will generate a fitness index based on
your aerobic fitness, or your capacity to engage any forms of aerobic
exercise, dependent and limited by the body’s ability to deliver oxygen
to the working muscles in training. It is often measured by maximum
oxygen uptake (VO2 Max), which is defined as the highest amount of
oxygen that can be utilized when exercising at an increasingly
demanding level. The lungs, heart, blood, circulatory system, and
working muscles are all factors in determined VO2 Max. The unit of
VO2 Max is ml/kg.min.
Generally, the fitness range lies between 13 to 53 depend on ages. The
higher the index, the fitter you are. (Refer to the following diagram for
reference.)