Fig 1.
Representative examples of time series of center of foot pressure (COP) and center of mass acceleration (COMacc) during quiet standing.
Representative examples of COP (top panel) and COMacc (bottom panel) for a child (left panel) and an adult (right panel) in the eyes open condition. Horizontal dashed lines in the top and bottom panels indicate mean position of COP and COMacc = 0, respectively.
Fig 2.
Group mean values of SD of center of foot pressure (COP), and center of mass acceleration (COMacc).
Group mean values of unnormalized SD of COP (a) and COMacc (b) for each age group and visual condition, and normalized COP (c) and COMacc (d). White and black bars indicate child and adult groups, respectively. Data are group means ± SD. *** and **** indicate statistical significances of P < 0.001 and P < 0.0001, respectively, between age groups. ## and ### indicate statistical significances of P < 0.01 and P < 0.001, respectively, between visual conditions.
Fig 3.
Representative power spectral density functions of center of mass acceleration (COMacc).
Representative power spectral density functions of COMacc in the eyes open (EO, solid lines) and eyes closed (EC, dashed lines) conditions for the same participants as shown in Fig 1. Gray and black colors indicate the results for the child and adult participants, respectively.
Fig 4.
Group mean values of the peak power, peak power frequency (PPF), and mean power frequency (MPF) of the center of mass acceleration (COMacc).
Group mean values of the unnormalized peak power (a), normalized peak power (b), peak power frequency (c) and mean power frequency (d) of the COMacc for each age group and visual condition. White and black bars indicate the results for child and adult groups, respectively. Data are group means ± SD. *, **, and *** indicate statistical significances of P < 0.05, P < 0.01, and P < 0.001, respectively, between age groups. # and ## indicate statistical significance of P < 0.05 and P < 0.01, respectively, between visual conditions.