Table 1. The muscle activity of serratus anterior, upper trapezius and pectoralis major muscle

Muscles	Mean ± SD (% MVIC)			F value	p value
Muscles	FFP	FFPS	FFPSH	F value	p value
SA	47.61±11.44	59.32±21.16^*	68.21±22.74^*	9.81	<0.01^*
UT	28.73±14.89	16.74±9.28	15.49±6.25	3.16	0.097
PM	19.47±9.18	17.51±6.78	18.97±7.54	2.08	0.108

FFP, Forward flexion with protraction; FFPS, Forward flexion with protraction with self-resistance; FFPSH, Forward flexion with protraction with self-resistance with hand-exerciser; SA (dominant), serratus anterior; UT (dominant), upper trapezius; PM (dominant), pectoralis major; SD, Standard deviation.
Significant difference between conditions (P_adj<0.01).