The percent of the predicted peak oxygen uptake achieved by a patient correlates with exercise impairment/intolerance.

NOTE: Severe exercise impairment is equivalent to poor aerobic capacity.



(1) observed peak oxygen uptake in mL per min per kg

(2) predicted peak oxygen uptake in mL per min per kg


percent of predicted peak oxygen uptake =

= (observed peak oxygen uptake) / (predicted peak oxygen uptake) * 100%


Percent of Predicted Peak Oxygen Uptake

Exercise Impairment

> 75%

none or minimal

50 to 75%


< 50%




60% of predicted might serve as a cut-off for moderate exercise intolerance.

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