Electromyographical Comparison of Four Common Shoulder Exercises in Unstable and Stable Shoulders

Table 2

Prone horizontal abduction descriptive analysis with mean (Mn) and standard deviation (SD) values were reported to be divided into six 30^∘ arcs. The results of each Kruskal-Wallis test are presented at the end of each column for the respective muscle and arc.

	0–30^∘		30–60^∘		60–90^∘		90–60^∘		60–30^∘		30–0^∘
	Mn	Sd	Mn	Sd	Mn	Sd	Mn	Sd	Mn	Sd	Mn	Sd
Supraspinatus
Healthy	15	(9)	32	(17)	48	(18)	32	(13)	16	(10)	7	(6)
GL	31	(19)	59	(31)	74	(30)	49	(20)	31	(15)	14	(9)
MDI	20	(14)	39	(22)	52	(27)	33	(16)	20	(11)	7	(9)
AI	16	(10)	32	(15)	45	(16)	27	(10)	18	(11)	6	(5)
𝑃 =	0.13		0.11		0.08		0.06		0.11		0.12
Infraspinatus
Healthy	19	(7)	32	(12)	36	(10)	26	(7)	20	(9)	11	(5)
GL	29	(12)	48	(14)	68	(21)	50	(18)	32	(10)	17	(7)
MDI	20	(15)	38	(24)	57	(42)	39	(25)	23	(13)	12	(13)
AI	18	(9)	30	(18)	33	(16)	24	(7)	21	(11)	11	(6)
𝑃 =	0.09		0.04^*		0.006^*		0.003^*		0.06		0.16
Teres major
Healthy	8	(8)	15	(12)	18	(15)	13	(10)	9	(8)	7	(6)
GL	6	(9)	16	(24)	27	(44)	27	(50)	14	(22)	10	(20)
MDI	2	(2)	2	(3)	5	(4)	5	(4)	3	(3)	2	(3)
AI	3	(3)	6	(4)	10	(8)	8	(8)	6	(3)	3	(2)
𝑃 =	0.28		0.04^*		0.23		0.43		0.43		0.23
Middle deltoid
Healthy	11	(6)	26	(10)	46	(20)	33	(15)	15	(7)	8	(4)
GL	11	(5)	26	(14)	43	(28)	28	(17)	16	(7)	10	(5)
MDI	9	(6)	25	(14)	38	(6)	25	(6)	17	10	10	(7)
AI	12	(5)	32	(16)	53	(25)	32	(12)	21	(9)	11	(4)
𝑃 =	0.55		0.6		0.66		0.6		0.56		0.45
Upper trapezius
Healthy	4	(4)	11	(8)	23	(18)	16	(10)	7	(5)	3	(2)
GL	7	(3)	14	(6)	19	(9)	14	(11)	10	(7)	6	(6)
MDI	6	(9)	11	(19)	11	(11)	6	(7)	8	(15)	5	8
AI	4	(3)	10	(6)	22	(13)	14	(10)	8	(6)	5	(3)
𝑃 =	0.16		0.16		0.13		0.16		0.28		0.36
Serratus anterior
Healthy	4	(7)	6	(9)	7	(13)	4	(5)	3	(5)	3	(4)
GL	4	(5)	6	(6)	11	(8)	8	(5)	6	(5)	2	(3)
MDI	2	(3)	4	(5)	6	(10)	4	(6)	2	(3)	2	(3)
AI	2	(3)	3	(4)	5	(6)	3	(3)	3	(3)	2	(3)
𝑃 =	0.73		0.4		0.09		0.06		0.14		0.89

^*Indicates significant difference between groups.