Cortical Activation During Walking in Stroke

After stroke, damage to one cerebral hemisphere disrupts the normal balance of activity between the two hemispheres. The affected hemisphere typically exhibits reduced excitability, whereas the unaffected side may demonstrate increased excitability. This phenomenon, referred to as interhemispheric imbalance, further inhibits activity in the affected hemisphere, thereby restricting motor recovery. According to the interhemispheric competition model, enhancing excitability in the affected hemisphere and/or suppressing excitability in the unaffected hemisphere may contribute to the improvement of motor function in individuals with stroke. Furthermore, as motor function recovers, the balance of interhemispheric activation in motor-related cortical areas undergoes corresponding changes. Previous studies have shown that treadmill training enhances the excitability of the primary motor cortex i