Adaptive changes in foot placement for split-belt treadmill walking in individuals with stroke

Area of Science:

• Biomechanics of human locomotion
• Neurorehabilitation strategies
• Gait analysis in neurological disorders

Background:

• Adaptation to split-belt treadmill walking varies among stroke survivors.
• Existing research often overlooks interlimb parameter adaptation during gait recovery.
• Understanding gait adaptation is key for effective rehabilitation.

Purpose of the Study:

• To investigate the symmetry of center of pressure (CoP) relative to center of mass (CoM) in stroke survivors.
• To determine if CoM-CoP symmetry can differentiate interlimb adaptation during split-belt walking.
• To explore the relationship between CoM-CoP symmetry and gait adaptation.

Main Methods:

• Twenty-two chronic stroke patients and nine elderly controls participated.
• Participants walked under tied-belt and split-belt (2:1 ratio) conditions.
• Symmetry of the CoM-CoP angle at foot contact was assessed.

Main Results:

• Asymmetry in the CoM-CoP angle correlated with asymmetric spatiotemporal gait parameters.
• Restored CoM-CoP symmetry corresponded with restored spatiotemporal symmetry in both groups.
• This indicates a link between CoM-CoP alignment and gait adaptation.

Conclusions:

• Stroke survivors capable of re-establishing CoM-CoP symmetry can adapt to split-belt walking perturbations.
• Predictively symmetric foot placement is essential for successful gait adaptation.
• Symmetrical foot placement, achieved through interlimb coordination, enhances dynamic stability.