Table 2. Muscle activity in three humeral position at 90° and 120° shoulder flexion (n=23)

Angle	Muscles	PD	NT	PU
90°	UT	31.84±20.54a	29.24±19.01	37.70±21.25
	LT	47.97±18.36	48.02±19.74	48.79±21.78
	SA	35.30±9.14	33.42±8.57	48.64±12.84
	IS	40.74±20.61	39.58±20.79	50.78±17.65
	AD	48.30±27.34	48.86±32.49	71.50±48.72
	MD	35.71±18.79	30.69±20.85	31.92±19.87
120°	UT	49.58±32.80	47.86±32.91	57.36±30.84
	LT	40.33±16.47	34.97±11.89	40.66±13.98
	SA	46.63±9.85	45.84±13.84	76.90±38.94
	IS	44.36±20.59	45.05±22.32	59.76±21.25
	AD	56.36±39.16	60.89±52.89	77.16±46.72
	MD	61.84±34.77	53.67±36.64	54.43±36.49

Mean±SD.
Abbreviation; PD, palm down; NT, neutral; PU, palm up; UT, upper trapezius; LT, lower trapezius; SA, serratus anterior; IS, infraspinatus; AD, anterior deltoid; MD, middle deltoid.