Figure 1
From: Influence of cheek support on respiratory impedance measured by forced oscillation technique
Effects of cheek support on respiratory mechanics in healthy subjects. The respiratory impedance was measured without cheek support and 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. without cheek support by one-way repeated measure ANOVA followed by Bonferroni test for post hoc analysis (n = 10).