Table 4.

Hypercapnic breathing (n = 10)

	Open	Closed	Open versus Closed
PIIA area
Diaphragm	0.007 ± 0.00	0.009 ± 0.00	P = 0.002*
Left PS	0.024 ± 0.00	0.023 ± 0.00	P = 1
Right PS	0.012 ± 0.00	0.013 ± 0.00	P = 0.35
PIIA time
Diaphragm	0.33 + 0.01	0.32 + 0.01	P = 0.89
Left PS	0.48 + 0.01	0.48 + 0.01	P = 1
Right PS	0.43 + 0.01	0.48 + 0.01	P = 0.002*
PIIA area/Total inspiratory area
Diaphragm	0.3 ± 0.01	0.304 ± 0.01	P = 0.81
Left PS	0.354 ± 0.01	0.359 ± 0.01	P = 0.55
Right PS	0.351 ± 0.01	0.36 ± 0.011	P = 0.48
PIIA time/Total inspiratory time
Diaphragm	0.305 ± 0.01	0.287 ± 0.01	P = 0.14
Left PS	0.383 ± 0.02	0.352 ± 0.01	P = 0.01*
Right PS	0.367 ± 0.01	0.388 ± 0.01	P = 0.15
Delta Pes	20.6 ± 1.51	17.4 ± 1.14	P = 0.10
Peak amplitude
Diaphragm	0.065 ± 0.01	0.046 ± 0.01	P < 0.001**
Left PS	0.121 ± 0.01	0.111 ± 0.01	P = 0.08
Right PS	0.071 ± 0.01	0.0729 ± 0.01	P = 0.46

Comparison between open versus closed abdominal trials under hypercapnic breathing. The numbers represent mean ± SEM. *denotes P‐value <0.05, **indicates P‐value <0.001.