Figure 1.

Lung volumes and capacities at rest and during exercise.

Notes: Lung volumes and capacities in a healthy elderly control (A and C) and in an aged-matched COPD patient (B and D). Gray parts represents lung volumes during exercise.

Abbreviations: COPD, chronic obstructive pulmonary disease; EELV, end-expiratory lung volume; EILV, end-inspiratory lung volume; ERV, expiratory reserve volume; FRC, functional residual capacity; FVC, forced vital capacity; IC, inspiratory capacity; IRV, inspiratory reserve volume; RV, residual volume; V_T, tidal volume.