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Prevalence of low breathing reserve (PR) and a pulmonary mechanical limit to exercise by FVC and V̇e/V̇co2 category. A and B: proportion of subjects by BR (A) and with limited aerobic capacity (peak V̇o2 < 80% predicted) with a pulmonary mechanical limit to exercise (BR < 20%; B) by both category of FVC and V̇e/V̇co2.
