Table 1 Comparison of EMG activity of elbow extensor muscle for each position

	In supine	In prone	t	p-value
Anconeus	74.07±20.26	57.40±23.00	-3.224	0.004*
LoT	77.72±19.29	92.97±30.45	-2.143	0.005*
LT	77.37±19.91	58.76±27.41	-3.780	0.001*

LoT: long head of triceps, LT : lateral triceps.