Is Freezing of Gait in Parkinson's Disease a Result of Multiple Gait Impairments? Implications for Treatment
Figure 2
Relationship between reduced step length and asymmetry in gait. (a) Reconstruction of data presented in Figure 2 of Chee et al. [7]. The data is taken from reduced step length condition from one PD + FOG patient. (b) Similar reconstruction was performed to all 6 traces presented in Chee et al. In this panel, the mean step length value of one leg (white bar) is plotted on top of the mean step length value of the other leg (grey bar), for one reduced step length trial of PD + FOG (based on the data from (a)), a PD patient who did not experience FOG, and a control subject (based on similar reconstruction of the original traces denoted in the original figure by “b 25%01” and “c25%01,” resp.). The asymmetry coefficient for these single gait trials is depicted above. GA values indicated in the text are the means obtained from two traces from each subject. GA—Gait asymmetry as expressed by step length differences between the left and right legs. (c) Average Step Length in the (i+1)th stride as a function of step length asymmetry calculated for the preceding stride (th). Based on data from (a).
