Table 2. Correlation between shoulder abduction angles and Z-score normalized muscle activity using Spearman’s rho

Spearman’s rho		Shoulder abduction angles	UT_Z-score	LT_Z-score	SA_Z-score
Shoulder abduction angles	r	1.000
	p	.
UT_Z-score	r	-0.851*	1.000
	p	0.001	.
LT_Z-score	r	0.215	-0.083	1.000
	p	0.156	0.586	.
SA_Z-score	r	0.926*	-0.840	0.220	1.000
	p	0.001	0.001	0.147	.

Abbreviations: UT, upper trapezius; LT, lower trapezius; SA, serratus anterior.