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. Author manuscript; available in PMC: 2017 Aug 1.
Published in final edited form as: J Neurol. 2016 May 18;263(8):1518–1529. doi: 10.1007/s00415-016-8158-4

Figure 2.

Figure 2

Protective stepping performance after backward perturbations: A) Center of mass (COM) displacement, B) Margin of stability, C) Number of steps, and D) Step Length in people with PD and healthy older adults (HO). Error bars represent standard error. * Significant practice effect across day 1; γ Significant group effect; ‡ Significant group by practice interaction; # Significant retention over 24 hours.