Table 3. Comparison of change of muscle activity and ODI within each group and between the groups.

		Group	Pre	Post
%RVC	RA	Experimental group	21.3 ± 5.1a	25.6 ± 4.2*
		Control group	21.6 ± 5.2	25.8 ± 4.3*
	TA	Experimental group	16.2 ± 2.4	19.4 ± 3.1*
		Control group	14.3 ± 3.2	15.7 ± 3.6
	EAO	Experimental group	16 ± 2.5	20.2 ± 2.1*
		Control group	17.3 ± 3.2	21 ± 3.5*
	ES	Experimental group	23 ± 6.49	28.2 ± 6*
		Control group	26 ± 5.19	29.1 ± 4.9*
ODI		Experimental group	27.1 ± 2.7	23.2 ± 1.9**
		Control group	28.2 ± 2.7	26.2 ± 1.7*

*p<0.05, **p<0.001. ^aMean ± SD, paired t-test, analysis of covariance. RA: rectus abdominis muscle; TA: transverse abdominis muscle; EAO: external abdominal oblique muscle; ES: erector spinae muscle; ODI: Oswestry Disability Index