TABLE I.
Bipedal stance | Unipedal Stance | |||||||
---|---|---|---|---|---|---|---|---|
Parameter | Eyes Open Mean (SD) |
Eyes Closed Mean (SD) |
Eyes Open Mean (SD) |
Eyes Closed Mean (SD) |
||||
Traditional posturographic measures | ||||||||
ML COP RMS (cm) | 0.37 | 0.24 | 0.36 | 0.18 | 0.48 | 0.10 | 1.28 | 0.26 |
AP COP RMS (cm) | 0.73 | 0.32 | 0.62 | 0.22 | 0.83 | 0.25 | 1.52 | 0.43 |
ML COP Velocity (cm/s) | 0.29 | 0.11 | 0.35 | 0.14 | 1.72 | 0.36 | 4.34 | 1.17 |
AP COP Velocity (cm/s) | 0.53 | 0.17 | 0.76 | 0.33 | 1.64 | 0.30 | 4.54 | 1.50 |
SDA measures | ||||||||
Dxs | 0.03 | 0.02 | 0.04 | 0.03 | 0.40 | 0.14 | 2.85 | 1.27 |
Dxl | 0.08 | 0.04 | 0.16 | 0.12 | 0.51 | 0.23 | 3.97 | 3.30 |
Dys | 0.11 | 0.05 | 0.20 | 0.14 | 0.91 | 0.30 | 6.75 | 3.75 |
Dyl | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.03 | 0.08 |
Drs | 0.04 | 0.03 | 0.02 | 0.02 | 0.06 | 0.07 | 0.05 | 0.08 |
Drl | 0.05 | 0.03 | 0.03 | 0.02 | 0.07 | 0.08 | 0.09 | 0.14 |
Hxs | 0.84 | 0.08 | 0.87 | 0.06 | 0.88 | 0.03 | 0.86 | 0.05 |
Hxl | 0.83 | 0.06 | 0.90 | 0.05 | 0.82 | 0.06 | 0.85 | 0.04 |
Hys | 0.83 | 0.06 | 0.90 | 0.05 | 0.83 | 0.04 | 0.86 | 0.03 |
Hyl | 0.32 | 0.16 | 0.23 | 0.11 | 0.08 | 0.09 | 0.04 | 0.08 |
Hrs | 0.37 | 0.14 | 0.21 | 0.12 | 0.22 | 0.16 | 0.05 | 0.07 |
Hrl | 0.38 | 0.12 | 0.23 | 0.11 | 0.19 | 0.13 | 0.04 | 0.05 |
Δtx | 1.30 | 0.32 | 1.43 | 0.32 | 0.90 | 0.15 | 1.01 | 0.34 |
Δty | 1.34 | 0.47 | 1.30 | 0.47 | 1.04 | 0.32 | 1.21 | 0.38 |
Δtr | 1.26 | 0.32 | 1.25 | 0.40 | 0.92 | 0.13 | 1.13 | 0.38 |
〈Δx2〉c | 0.06 | 0.04 | 0.09 | 0.06 | 0.35 | 0.12 | 3.00 | 1.16 |
〈Δy2〉c | 0.18 | 0.12 | 0.27 | 0.15 | 0.62 | 0.35 | 4.82 | 3.45 |
〈Δr2〉c | 0.22 | 0.10 | 0.34 | 0.18 | 0.95 | 0.40 | 7.75 | 3.97 |
COP-VAF measures | ||||||||
First Minimum Time (s) | 0.63 | 0.28 | 0.52 | 0.18 | 0.35 | 0.11 | 0.34 | 0.13 |
First Minimum Value (cm2/s2) | −0.14 | 0.16 | −0.34 | 0.44 | −2.34 | 1.58 | −19.49 | 21.28 |
Initial VAF Value (cm2/s2) | 0.77 | 0.60 | 1.59 | 1.47 | 10.21 | 3.44 | 82.78 | 57.89 |
Time to Zero (s) | 0.38 | 0.15 | 0.33 | 0.13 | 0.20 | 0.06 | 0.20 | 0.09 |
D0 (cm2/s) | 0.02 | 0.02 | 0.01 | 0.02 | 0.07 | 0.08 | 0.30 | 0.40 |