Table 1. Comparison of lower-extremity muscular activity according to changes in support and inclined board (Units: %).

	SS (0°)	US (0°)	SIB (20°)	UIB (20°)
VL**	55.5 ± 10.8	58.7 ± 11.1	72.3 ± 10.7	84.7 ± 9.6
VM**	56.5 ± 11.3	58.7 ± 10.0	73.5 ± 11.5	87.5 ± 8.8
RF**	55.4 ± 16.3	57.1 ± 14.5	64.9 ± 16.2	77.8 ± 16.2
Ga**	33.5 ± 13.8	58.3 ± 16.5	61.2 ± 20.1	61.9 ± 17.2
So**	44.7 ± 11.1	68.8 ± 12.1	63.5 ± 19.7	65.4 ± 19.5
TA**	43.1 ± 14.2	62.9 ± 13.5	59.7 ± 17.2	63.8 ± 18.7

SS: stable support; US: unstable support; SIB: stable inclined board; UIB: unstable inclined board; VL: vastus lateralis; VM: vastus medialis; RF: rectus femoris; Ga: gastrocnemius; So: soleus; TA: tibialis anterior. *p<0.05, **p<0.01