Table 5. Correlations between muscle activation, kinematics and functional status in children with DMD.

	Global indexes of muscle activity		Co activation index
	Ker-EGI (N = 13)	Global EMG-PS (N = 16)	RF/HS (N = 16)	VL/HS (N = 13)	TA/GAS (N = 16)
Vignos functional scale	-0.53 p = 0.06	0.57 *	0.66 **	0.13 p = 0.66	0.15 p = 0.57
GDI	0.57 *	-0.59 *	-0.55 *	-0.49 p = 0.09	-0.62 *
GPS	-0.62 *	0.66 **	0.54 *	0.45 p = 0.13	0.61 *
Gait speed (m/sec)	0.001 p = 0.97	0.19 p = 0.48	-0.09 p = 0.74	-0.63 *	-0.12 p = 0.66

Ker-EGI, Ker-electromyography gait index; EMG-PS, electromyography profile score; GDI, gait deviation index; GPS, gait profile score; Values presented are the mean of both sides.

^a p values were calculated using the Spearman correlation test (* p<0.05; ** p<0.01, *** p<0.001).