Fig. 1From: Effect of spirometry on intra-thoracic pressuresRepresentative flow (a), volume (b), and oesophageal pressure (c) traces from a single subject performing an FVC manoeuvre. Peak flow = 6.78 L s−1; volume = 5.84 L; peak inspiratory oesophageal Pressure = 58 cmH2O; peak expiratory oesophageal pressure = 169 cmH2OBack to article page