Table 2.
Gait characteristics before slipping, and reactive balance measures in response to slipping, for the three slip groups. Values are means (standard deviation)
| Baseline (n = 11) |
Post-Control (n = 5) |
Post-PBT (n = 11) |
ANOVA p-value |
|
|---|---|---|---|---|
| Gait characteristics before slipping | ||||
| Gait speed (m/s) | 1.48 (0.11) | 1.53 (0.13) | 1.55 (0.11) | .314 |
| Step length (%BH) | 43.3 (0.3) | 44.7 (0.4) | 44.7 (0.2) | .530 |
| Minimum toe clearance (mm) | 17.0 (6.9) | 26.8 (14.0) | 22.1 (9.5) | .230 |
| Required coefficient of friction | 0.21 (0.02) | 0.22 (0.03) | 0.21 (0.02) | .756 |
| Reactive balance in response to slipping | ||||
| Peak slip speed (m/s) | 2.80 (0.32) | 3.15 (0.33) | 2.58 (0.41) | .041 |
| Slip distance (cm) | 80.8 (4.5) | 74.2 (6.6) | 71.4 (4.5) | .346 |
| Non-slipping toe to COM at TD (%BH) | −5.8 (6.0) | −2.7 (6.8) | − 2.2 (9.2) | .498 |
| Minimum hip height (%) | 80.6 (3.9) | 82.0 (5.7) | 86.2 (4.4) | .043 |
| Margin of stability at TD (cm) | 5.9 (4.8) | 13.6 (6.8) | 17.0 (12.3) | .027 |
| vCOM relative to BOS at TD (m/s) | 1.02 (0.23) | 0.52 (0.32) | 0.24 (0.62) | .004 |
See Methods text for boundaries used to calculate margin of stability. A smaller positive vCOM relative to BOS indicates the slipping foot and COM are moving apart less quickly
BH body height, COM center of mass, TD touchdown of non-slipping foot after reactive stepping, vCOM anterior-posterior velocity of the COM, BOS base of support
Bold indicates statistically significant main effect of slip group. Minimum hip height is expressed as a percentage of standing hip height