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Baseline, low-level (20 W) and peak exercise for (A) respiratory rate, (B) tidal volume (VT), (C) minute ventilation (VE), (D) inspiratory drive [tidal volume/inspiration time (VT/TI)], (E) dead space ventilation relative to tidal volume (VD/VT), and (F) peak oxygen consumption in heart failure with preserved ejection fraction and control subjects. *P < 0.05 between groups.
