Fig. 3.—
End-inspiratory (○; •) and end-expiratory (□; ▪): a) chest wall volume (Vcw); b) pulmonary ribcage volume (Vrc,pulm); c) abdominal ribcage volume (Vrc,Abd); and d) abdominal volume (VAbd) in controls (○; □) and patients (•; ▪) during quiet breathing (QB) and at different expired carbon dioxide tensions (PCO2). Data are presented as mean±sem. The vertical distance between the two values is the tidal volume (….: end-expiratory volume, set to zero, during room air breathing). *: p<0.05versusend-expiratory/end-inspiratory volume in same group during QB. 1 mmHg=0.133 kPa.