Table 3.

Eupneic breathing (n = 10)

	Open	Closed	Open versus Closed
PIIA area
Diaphragm	0.004 ± 0.00	0.005 ± 0.00	P < 0.001**
Left PS	0.019 ± 0.00	0.022 ± 0.00	P = 0.39
Right PS	0.009 ± 0.00	0.01 ± 0.00	P = 0.78
PIIA time
Diaphragm	0.5 ± 0.02	0.37 ± 0.02	P < 0.001**
Left PS	0.73 ± 0.02	0.75 ± 0.02	P = 1
Right PS	0.77 ± 0.02	0.75 ± 0.02	P = 1
PIIA area/Total inspiratory area
Diaphragm	0.361 ± 0.02	0.323 ± 0.02	P = 0.10
Left PS	0.398 ± 0.01	0.438 ± 0.03	P = 0.11
Right PS	0.393 ± 0.02	0.425 ± 0.02	P = 0.12
PIIA time/Total inspiratory time
Diaphragm	0.331 ± 0.02	0.308 ± 0.02	P = 0.31
Left PS	0.342 ± 0.02	0.404 ± 0.02	P = 0.03*
Right PS	0.422 ± 0.02	0.442 ± 0.02	P = 0.26
Delta Pes	1.94 ± 0.11	2.08 ± 0.14	P = 0.2
Peak amplitude
Diaphragm	0.013 ± 0.00	0.012 ± 0.002	P = 1
Left PS	0.04 ± 0.00	0.039 ± 0.00	P = 0.74
Right PS	0.019 ± 0.00	0.018 ± 0.00	P = 0.63

Comparison between open versus closed abdominal trials under eupneic breathing. Measurements are presented as mean ± SEM. *indicates P‐value <0.05, **indicates P‐value <0.001.