Table 3.

Six variability parameters were calculated using accelerations from three directions.

Details	Parameter Computation	Equation Number
RMS vector magnitude	$\mathrm{RMST}=\sqrt{\mathrm{RMS}\_{\mathrm{AP}}^2+\mathrm{RMS}\_{\mathrm{V}}^2+\mathrm{RMS}\_{\mathrm{ML}}^2},$	(2)
Normalized RMS in AP direction	${\mathrm{RMSR}}_{\mathrm{AP}}=\frac{{\mathrm{RMS}}_{\mathrm{AP}}}{\mathrm{RMST}},$	(3)
Normalized RMS in ML direction	${\mathrm{RMSR}}_{\mathrm{ML}}=\frac{{\mathrm{RMS}}_{\mathrm{ML}}}{\mathrm{RMST}}$	(4)
Normalized RMS in Vertical direction	${\mathrm{RMSR}}_{\mathrm{V}}=\frac{{\mathrm{RMS}}_{\mathrm{V}}}{\mathrm{RMST}},$	(5)
Harmonic Ratio in Vertical and AP direction	$\mathrm{Harmonic}\mathrm{Ratio}=\sum \mathrm{even}\mathrm{harmonics}/\sum \mathrm{odd}\mathrm{harmonics}$	(6)
Harmonic Ratio in ML direction	$\mathrm{Harmonic}\mathrm{Ratio}=\sum \mathrm{odd}\mathrm{harmonics}/\sum \mathrm{even}\mathrm{harmonics}$	(7)