Figure 1. Changes, before and after pulmonary rehabilitation (PR), in the inspiratory (operating) volume of the chest wall (A), rib cage (B), and abdomen (C) during incremental exercise at an equivalent workload, defined as the percentage of the maximum workload achieved during the pre-PR incremental exercise test. White symbols: before PR; black symbols: after PR; ∆V: volume change from resting state; TLC (---): total lung capacity, measured before PR; triangles: end-inspiratory volumes; circles: end-expiratory volumes; QB: quiet breathing; and UP: unloaded pedaling. *p < 0.05 vs. pre-PR value.