Table 2.

The abbreviated variables

	The abbreviated variables	The meaning of CoP variables
Left foot	L_ML_V	Medial-lateral velocity of CoP for left foot
	L_AP_V	Anterior-posterior velocity of CoP for left foot
	L_Res_V	Resultant velocity of CoP for left foot
	L_F_V	Force change rate of vertical ground reaction force for left foot
	L_ML_A	Medial-lateral acceleration of CoP for left foot
	L_AP_A	Anterior-posterior acceleration of CoP for left foot
	L_Res_A	Resultant acceleration of CoP for left foot
Right foot	R_ML_V	Medial-lateral velocity of CoP for right foot
	R_AP_V	Anterior-posterior velocity of CoP for right foot
	R_Res_V	Resultant velocity of CoP for right foot
	R_F_V	Force change rate of ground vertical reaction force for right foot
	R_ML_A	Medial-lateral acceleration of CoP for right foot
	R_AP_A	Anterior-posterior acceleration of CoP for right foot
	R_Res_A	Resultant acceleration of CoP for right foot