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Breathing Reserve (%) Calculator
Breathing Reserve (BR%) Calculator: Explanation and Clinical Context Breathing Reserve is the difference between the predicted maximal voluntary ventilation (VEmax) and the peak exercise ventilation (VEpeak), expressed as a percentage of VEmax. It reflects the ventilatory capacity left unused at peak exercise. A normal BR% is typically 20-40%, indicating adequate ventilatory reserve. A lower BR% (<20%) suggests a ven