Figure 4.

Some representative plots of the stride cycle duration during an entire walking test. All the displayed data are in WTS condition: (a) Very regular walking over the whole range; (b) a walking dataset clearly characterized by sharp “transitions” from a walking regime to another. Different regimes have been highlighted by using different point stiles (also to produce a clearer output for the plot in panel d)); (c) an intermediate situation between the two previous ones, characterizing most subjects; (d) 2D-projection of reconstructed trajectories in the phase-space produced by the data of panel b): the different symbols highlight the presence of local attractors for the orbits.