Fig. 1From: Acute effects of combined exercise and oscillatory positive expiratory pressure therapy on sputum properties and lung diffusing capacity in cystic fibrosis: a randomized, controlled, crossover trialExperimental study design. fR, respiratory frequency; HR, heart rate; SpO2, oxygen saturation; V’CO2, carbon dioxide production; V’E, minute ventilation; V’O2, oxygen consumption; VT, tidal volume. The grey shaded area represents the periods when the participants breathed through the mouthpiece for metabolic cart measurementsBack to article page