Table 2.

Results of a two-factor repeated-measures analysis of variance of muscle activity and intra-abdominal pressure (IAP) development.

	Breathing task		Posture		Posture × breathing task
	F value	p value	F value	p value	F value	p value
Inspiratory phase
TrA-IO	10.878	0.002*	3.906	0.070	2.053	0.164
EO	0.286	0.835	74.904	0.001*	2.110	0.146
IAP	9.459	0.001*	54.695	0.001*	2.219	0.101
Expiratory phase
TrA-IO	12.488	0.001*	0.388	0.544	6.222	0.009*
EO	6.522	0.014*	76.044	0.001*	4.258	0.011*
IAP	19.850	0.001*	5.104	0.042*	34.574	0.001*

TrA-IO transverse abdominal and internal oblique muscle, EO external oblique muscle.

*p < 0.05.