# Table 2 Summary of the extracted measures

Measure abbreviation Description
JERK Sway jerkiness, time derivative of acceleration[m2/s5] $JERK=\frac{1}{2}\underset{0}{\overset{t}{\int }}{\left(\frac{dACC{L}_{\mathit{AP}}}{dt}\right)}^{2}+{\left(\frac{dACC{L}_{\mathit{ML}}}{dt}\right)}^{2}$
Time-domainmeasures
DIST Mean distance from center of COP (ACC) trajectory[mm] ([m/s2])
RMS Root mean square of COP (ACC) time series [mm]([m/s2])
PATH Sway path, total length of COP (ACC) trajectory[mm] ([m/s2])
RANGE Range of COP displacement (acceleration) [mm]([m/s2])
MV Mean velocity COP: PATH/trial duration [m/s];ACC: $\sqrt{{\left(\int ACC{L}_{\mathit{AP}}\right)}^{2}+{\left(\int ACC{L}_{\mathit{ML}}\right)}^{2}}$ [mm/s]
MF Mean frequency, the number, per second, of loopsthat have to be run by the COP (ACC), to cover atotal trajectory equal to PATH (MF = PATH/(2*π*DIST*trial duration) (Hz)
AREA Sway area, computed as the area spanned fromthe COP (ACC) per unit of time [mm2/s] ([m2/s5])
Frequency-domainmeasures
PWR Total power [mm2] ([m2/s4])
F50 Median frequency, frequency below which the50% of PWR is present (Hz)
F95 95% power frequency, frequency below which the95% of PWR is present (Hz)
CF Centroidal frequency (Hz)
FD Frequency dispersion (−)