Early Postural Instability in Parkinson’s Disease: A Biomechanical Analysis of the Pull Test

Figure 1

Force to reach the backward limit of stability (FBLoS) in the analyzed groups. PD: Parkinson's disease patients. H–Y: Hoehn–Yahr. Adjusted for age and gender. (a) Association between FBLoS and age in healthy subjects. (b) Comparison of FBLoS between healthy subjects and PD patients. (c) Comparison of FBLoS between healthy subjects and PD H–Y stages I-II. (d) Comparison of FBLoS between PD H–Y stages I-II and PD H–Y stage III. (e) Comparison of FBLoS between PD nonfallers and PD fallers. (f) Association between FBLoS and motor UPDRS score in PD patients.

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