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Figure 4 Cardiorespiratory response during the 6 min walking test (6MWT) under placebo (circles) and ipratropium bromide (triangles). Time course (open symbols) and end‐exercise (closed symbols) values are shown for (A) oxygen consumption (V̇o2), (B) minute ventilation (V̇E), (C) V̇E/maximal voluntary ventilation (MVV), (D) respiratory rate (RR), (E) dyspnoea, and (F) heart rate (HR). The dashed line represents the peak value achieved on the incremental shuttle walk. Values are mean (SE).
