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Figure 4 | Journal of NeuroEngineering and Rehabilitation

Figure 4

From: Effects of an attention demanding task on dynamic stability during treadmill walking

Figure 4

Orbital stability results. Magnitudes of maximum Floquet multipliers (MaxFM) for Poincaré sections taken at 25% and 75% of the gait cycle for trunk velocities in the AP, ML, and VT directions. All subjects were orbitally stable (all MaxFM < 1) in all directions, but somewhat less stable (i.e., larger MaxFM) in the ML direction, compared to the AP and VT directions. During the Stroop test, subjects tended to be slightly more stable in the ML direction, but slightly more unstable in the AP and VT directions. This greater instability was statistically significant at the 75% Poincaré section (p = 0.009). Similar results were obtained at the 0%, 50%, and 100% Poincaré sections, but no significant Condition effects (0.231 < p < 0.996) were found. There were no statistically significant Subject × Condition interaction effects for any of the comparisons (0.07 < p < 0.85).

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