Table 2 Summary of the extracted measures

JERK

Sway jerkiness, time derivative of acceleration[m²/s⁵] $JERK=\frac{1}{2}{\displaystyle \underset{0}{\overset{t}{\int }}{\left(\frac{dACC{L}_{\mathit{AP}}}{dt}\right)}^2+{\left(\frac{dACC{L}_{\mathit{ML}}}{dt}\right)}^2}$

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: $\sqrt{{\left({\displaystyle \int ACC{L}_{\mathit{AP}}}\right)}^2+{\left({\displaystyle \int ACC{L}_{\mathit{ML}}}\right)}^2}$ [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 (−)