Table 1.

Relative reductions in alveolar volumes and surface areas for different respiratory maneuvers

			Alveolar Area Reduction, %
Respiratory Maneuver	Lung Volume Reduction, liter	Alveolar Volume Reduction, %	a = 0 μm	a = 75 μm	a = 100 μm	a = 150 μm
TLC →FRC	6.8 → 2.2	30.8	45.7	43.1	42.0	43.6
TLC → RV	6.8 → 1.6	21.8	36.2	33.4	32.4	36.2
FRC + Vt → FRC	2.7 → 2.2	80.4	86.5	85.3	84.9	87.1

a, Alveolar opening radius; TLC, total lung capacity; FRC, functional residual capacity; RV, residual volume; V_t, tidal volume.