Figure 4
From: Influence of cheek support on respiratory impedance measured by forced oscillation technique
Effects of cheek support on respiratory mechanics in patients with respiratory diseases. The respiratory impedance was measured with cheeks supported by a subject and an operator. Rrs at 5 Hz (R5; A) and at 20 Hz (R20; B), R5/R20 (C), and Xrs at 5 Hz (X5; D) during a whole-breath (Whole), inspiratory (Insp) and expiratory (Exp) phases, and the difference (Δ) between inspiratory and expiratory phases (Insp-Exp) are shown. Values are mean ± SD. *: Significantly different (P < 0.05) vs. cheek support by subjects by paired t-test (n = 18).