Split-belt locomotion in Parkinson's disease with and without freezing of gait

► Parkinson's patients are able to adapt to split-belt treadmill walking. ► Freezers show an increase in stride time asymmetry due to split-belt walking. ► Freezers show an increase in stride time variability due to split-belt walking. ► Freezing may be related to gait asymmetries and to gait timing deficits.