Influence of cheek support on respiratory impedance measured by forced oscillation technique

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Table 2 Effects of cheek support protocols on respiratory impedance spectra in healthy and diseased groups

Impedance parameters		Cheek support protocols	Healthy vs. diseased groups	Interaction between cheek support protocols and groups
R5, cmH₂O/L/s	Whole	P = 0.007	NS	NS
	Inspiratory	P = 0.017	NS	NS
	Expiratory	P = 0.017	NS	NS
	Δ	NS	NS	NS
R20, cmH₂O/L/s	Whole	NS	NS	NS
	Inspiratory	NS	NS	NS
	Expiratory	NS	NS	NS
	Δ	NS	NS	NS
R5/R20	Whole	P = 0.001	P < 0.001	NS
	Inspiratory	P < 0.001	P = 0.003	NS
	Expiratory	P = 0.005	P < 0.001	NS
X5, cmH₂O/L/s	Whole	P < 0.001	P = 0.044	P = 0.005
	Inspiratory	P = 0.003	P = 0.024	NS
	Expiratory	P = 0.002	NS	P = 0.01
	Δ	NS	NS	NS

Difference between two cheek support protocols (supported by subjects and the operator) in respiratory impedance during a whole-breath (Whole), inspiratory and expiratory phases, and the difference (Δ) between inspiratory and expiratory phases were compared by two-way repeated measure ANOVA followed by Bonferroni test for post hoc analysis in healthy subjects (n = 10) and patients with respiratory diseases (n = 18).