The relation between limb loading and control parameters of gait initiation in persons with stroke

Area of Science:

• Neurorehabilitation
• Biomechanics
• Motor Control

Background:

• Gait initiation is a critical phase of walking, often impaired after stroke.
• Understanding the biomechanical factors influencing gait initiation is crucial for effective rehabilitation.

Purpose of the Study:

• To investigate the relationship between limb loading during stance and gait initiation characteristics in post-stroke patients.
• To identify biomechanical differences in gait initiation based on weight-bearing distribution on the affected limb.

Main Methods:

• Thirteen post-stroke patients were assessed during gait initiation tasks.
• Peak ground reaction forces and electromyographic (EMG) activity of lower limb muscles were recorded using a force platform.
• Patients were grouped based on the amount of weight borne by the involved limb before gait initiation.

Main Results:

• Strong correlations were found between initial limb loading and ground reaction forces during gait initiation (r = .79 to .95).
• Patients with reduced weight bearing on the involved limb exhibited significantly altered (p < .001) ground reaction forces and an inability to generate forward momentum.
• Increased gastrocnemius activity was observed in the non-involved limb during stance for all patients.

Conclusions:

• Symmetrical weight bearing during the pre-initiation phase is correlated with the ability to generate propulsive forces for gait initiation.
• Impaired weight distribution on the involved limb negatively impacts forward momentum generation during gait initiation in stroke survivors.