Figure 3

Local dynamic stability results for AP, ML, and VT trunk velocities. These data were log transformed to satisfy linearity and normality constraints of the ANOVA analyses. A: Divergence amplitudes (A in Eq. 5) were slightly greater in the ML direction (p = 0.055) during Control (CO) walking relative to Stroop test (ST) walking. B: Short-term time constants (τ _S in Eq. 5) were not significantly different between the 2 tasks. C: Long-term time constants (τ _L in Eq. 5) were significantly smaller (i.e., indicating greater local instability) for the CO walking condition for movements in the AP direction (p = 0.024). This same trend was observed in the ML direction, but was not statistically significant (p = 0.200). The "*" indicate statistically significant Subject × Condition interaction effects (p < 0.05). In general, the Stroop test led to slightly more stable movements in the AP direction, but slightly more un stable movements in the ML direction, compared to CO walking.