Table 3. Significance of EMG activity of scapular upward rotators and shoulder muscles on humeral position and shoulder flexion angle (n=23)

Muscles	Variables	F-value	p-value
UT	Angle	47.76	.000*
	Arm position	20.09	.000*
	Angle×arm position	0.69	0.51
LT	Angle	11.72	.002*
	Arm position	2.46	0.11
	Angle×arm position	2.87	0.08
SA	Angle	29.79	.000*
	Arm position	16.65	.000*
	Angle×arm position	2.55	0.10
IS	Angle	10.79	.003*
	Arm position	7.45	.004*
	Angle×arm position	2.90	0.08
AD	Angle	8.87	.007*
	Arm position	25.82	.000*
	Angle×arm position	0.72	0.50
MD	Angle	29.51	.000*
	Arm position	13.75	.000*
	Angle×arm position	1.53	0.24

p<0.017.
Abbreviation; UT, upper trapezius; LT, lower trapezius; SA, serratus anterior; IS, infraspinatus; AD, anterior deltoid; MD, middle deltoid.