Table 1. Correlation between the muscle activities and joint angles of the lower extremity according to the changes in stance width during lifting.

			Stance width	Hip flexion angle	Knee flexion angle	Muscle activity
						TA	RF	GM	ES
Stance width		r	1	0.165	−0.169	−0.285*	−0.145	0.127	−0.074
		p		0.263	0.250	0.049	0.326	0.388	0.616
Hip flexion angle		r		1	−0.018	−0.025	−0.276	0.236	0.232
		p			0.903	0.864	0.057	0.107	0.113
Knee flexion angle		r			1	0.076	−0.251	−0.242	−0.444**
		p				0.607	0.085	0.098	0.002
Muscle activity	TA	r				1	0.077	0.295*	−0.091
		p					0.602	0.042	0.539
	RF	r					1	−0.114	−0.132
		p						0.442	0.371
	GM	r						1	0.205
		p							0.162
	ES	r							1
		p

r, correlation coefficient; p, probability; TA, tibialis anterior; RF, rectus femoris; GM, gluteus maximus; ES, erector spinae. *p<0.05; **p<0.01