Table 5 Center of pressure (CoP) variables in anterior/posterior (A/P) and mediolateral (M/L) direction during the two movement phases. Median (min, max) (n = 28)
Stable | Slightly unstable | Unstable | Friedman | Wilcoxon Paired sign-rank (Bonferroni-adjusted) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Med | Min | Max | Med | Min | Max | Med | Min | Max | p-value | stable vs unstable | stable vs slightly unstable | slightly unstable vs unstable | |
Down | |||||||||||||
A/P Mean displacement | 0.074 | -0.015 | 0.122 | 0.064 | 0.003 | 0.108 | 0.074 | 0.003 | 0.111 | 0.897 | |||
A/P Min position | 52.99 | 25.69 | 85.89 | 68.90 | 27.33 | 117.68 | 56.61 | 36.70 | 88.21 | 0.017 | 0.539 (1.000) | 0.008 (0.023) | 0.033 (0.098) |
A/P Max position | 137.88 | 90.66 | 188.15 | 144.72 | 104.91 | 185.92 | 143.73 | 98.48 | 191.23 | 0.101 | |||
A/P Diference min/max | 82.74 | 40.63 | 134.69 | 84.59 | 26.73 | 121.98 | 86.00 | 34.63 | 124.63 | 0.775 | |||
A/P Total sum | 227 | 137 | 360 | 267 | 119 | 382 | 231 | 143 | 440 | 0.002 | 0.894 (1.000) | 0.002 (0.006) | 0.003 (0.019) |
Up | |||||||||||||
A/P Mean displacement | 0.021 | -0.011 | 0.044 | 0.007 | -0.096 | 0.059 | -0.001 | -0.071 | 0.034 | <0.001 | <0.001 (<0.001) | 0.001 (0.004) | 0.229 (0.687) |
A/P Min position | 53.19 | 5.00 | 125.33 | 55.04 | 32.69 | 101.96 | 49.76 | 17.51 | 83.22 | 0.501 | |||
A/P Max position | 169.96 | 91.85 | 209.00 | 167.67 | 117.51 | 219.98 | 154.77 | 103.89 | 190.80 | 0.002 | 0.008 (0.023) | 0.504 (1.000) | 0.001 (0.003) |
A/P Diference min/max | 122.33 | 39.20 | 166.76 | 116.77 | 55.43 | 160.98 | 101.65 | 34.53 | 166.61 | 0.501 | |||
A/P Total sum | 352 | 176 | 533 | 393 | 145 | 475 | 309 | 155 | 506 | 0.501 | |||
Down | |||||||||||||
M/L Mean displacement | -0.001 | -0.025 | 0.035 | -0.001 | -0.033 | 0.023 | 0.001 | -0.030 | 0.033 | 0.623 | |||
M/L Min position | -329.92 | -354.58 | -311.29 | -324.75 | -344.33 | -312.13 | -338.13 | -357.49 | -298.28 | 0.105 | |||
M/L Max position | -296.52 | -322.99 | -275.43 | -293.44 | -315.42 | -270.95 | -304.83 | -327.64 | -269.81 | 0.048 | 0.304 (0.913) | 0.153 (0.458) | 0.014 (0.042) |
M/L Difference min/max | 30.08 | 17.43 | 62.33 | 32.91 | 7.19 | 56.26 | 27.72 | 11.98 | 69.77 | 0.101 | |||
M/L Total sum | 255 | 171 | 396 | 253 | 159 | 400 | 256 | 173 | 462 | 0.623 | |||
Up | |||||||||||||
M/L Mean displacement | 0.00 | -0.03 | 0.04 | 0.000 | -0.030 | 0.029 | 0.009 | -0.027 | 0.026 | 0.324 | |||
M/L Min position | -329.11 | -374.72 | -315.48 | -323.61 | -361.19 | -295.37 | -334.49 | -375.56 | -297.49 | 0.087 | |||
M/L Max position | -294.41 | -339.88 | -263.22 | -288.04 | -321.08 | -256.18 | -302.94 | -336.61 | -250.78 | 0.012 | 0.142 (0.425) | 0.142 (0.425) | 0.003 (0.010) |
M/L Difference min/max | 37.21 | 15.06 | 56.81 | 38.35 | 16.71 | 67.83 | 35.40 | 14.69 | 64.63 | 0.646 | |||
M/L Total sum | 276 | 194 | 512 | 340 | 142 | 497 | 287 | 197 | 423 | 0.324 | |||
Down | |||||||||||||
Total displacement Mean | 0.401 | 0.290 | 0.494 | 0.420 | 0.290 | 0.516 | 0.376 | 0.211 | 0.465 | 0.083 | |||
Total displacement total sum | 0 | 0 | 0 | 411 | 221 | 608 | 383 | 247 | 641 | 0.137 | |||
Up | |||||||||||||
Total displacement Mean | 0.008 | 0.000 | 0.020 | 0.405 | 0.290 | 0.444 | 0.360 | 0.243 | 0.467 | 0.212 | |||
Total displacement Total sum | 490 | 306 | 789 | 586 | 224 | 741 | 485 | 278 | 764 | 0.593 | |||
Down | |||||||||||||
COP area | 2233 | 970 | 7862 | 2361 | 488 | 5321 | 2167 | 865 | 7357 | 0.721 | |||
Up | |||||||||||||
COP area | 4588 | 1205 | 7302 | 4600 | 936 | 8088 | 2910 | 1276 | 8607 | 0.623 | |||