Table 2 Summary of instrumented standing balance outcome measures used in the current study
Measure abbreviation | Description |
|---|---|
Jerk | Sway jerk, the time derivative of acceleration (ACC) (m2/s5) |
Distance | Mean distance from center of COP (ACC) trajectory [mm](m/s2) |
Area | Sway area, computed as area spanned from COP (ACC) per unit of time [mm2/s] (m2/s5) |
RMS | Root mean square of COP (ACC) time series [mm](m/s2) |
Path length | Sway path, total length of COP (ACC) trajectory [mm](m/s2) |
Range | Range of COP displacement (ACC) [mm](m/s2) |
Mean velocity | Mean velocity COP = PATH/(trial duration) [m/s] |
Mean frequency | Mean frequency = PATH/(2*n*DIST*(trial duration)) (Hz) |
95% frequency | 95% power frequency, frequency below which 95% of PWR is present (Hz) |
Frequency dispersion | Frequency dispersion (Hz) |