Table 1.
Analysis of the anterior-posterior (AP) and medial-lateral (ML) center of pressure (COP) fluctuation parameters. Shown are: mean distance (MD), mean velocity (MV), range (RANGE), mean frequency (MFREQ), centroidal frequency (CFREQ), frequency dispersion (FREQD) and 50 % power (P50) frequency. Results show the mean ± S.D. for each COP fluctuation parameter and compare unsupported and FES-assisted sitting in 15 (n = 15) able-bodied individuals
| Measures | Unsupported sitting | FES-Assisted sitting | Wilcoxon signed-ranks test | |
|---|---|---|---|---|
| MD (mm) | AP | 0.61 ± 0.26 | 0.54 ± 0.24 | |
| ML | 0.52 ± 0.26 | 0.46 ± 0.28 | ||
| MV (mm/s) | AP | 2.80 ± 0.41 | 3.04 ± 0.61 | * |
| ML | 2.02 ± 0.54 | 2.30 ± 0.77 | ||
| RANGE (mm) | AP | 0.40 ± 0.18 | 0.37 ± 0.14 | |
| ML | 0.36 ± 0.23 | 0.33 ± 0.14 | ||
| MFREQ (Hz) | AP | 0.97 ± 0.30 | 1.13 ± 0.35 | * |
| ML | 0.82 ± 0.22 | 1.01 ± 0.27 | * | |
| CFREQ (Hz) | AP | 1.72 ± 0.23 | 1.82 ± 0.25 | |
| ML | 1.71 ± 0.19 | 1.67 ± 0.27 | ||
| FREQD (-) | AP | 0.59 ± 0.05 | 0.56 ± 0.03 | ** |
| ML | 0.56 ± 0.05 | 0.54 ± 0.06 | ||
| P50 (Hz) | AP | 0.50 ± 0.10 | 0.55 ± 0.13 | * |
| ML | 0.48 ± 0.12 | 0.55 ± 0.14 |
*p < 0.05; **p < 0.01