Closed-Loop Plantar Cutaneous Augmentation by Electrical Nerve Stimulation Increases Ankle Plantarflexion During...

Area of Science:

• Neuroscience
• Biomechanics
• Biomedical Engineering

Background:

• Ankle plantarflexion is crucial for walking, balance, and forward propulsion.
• Neurological conditions often impair this vital gait component.
• Restoring plantar flexion is a key goal in rehabilitation.

Purpose of the Study:

• To investigate if augmenting plantar cutaneous feedback via nerve stimulation can enhance ankle plantarflexion during walking.
• To assess the effects of closed-loop distal-tibial nerve stimulation on gait kinematics in rats.

Main Methods:

• A rat model with an implanted device for neural recording and stimulation was used.
• Closed-loop stimulation of the distal-tibial nerve was triggered by medial gastrocnemius muscle activity during the stance phase.
• Gait kinematics and ankle joint angles were analyzed during treadmill walking with varying stimulation intensities.

Main Results:

• Stimulation significantly increased maximum ankle plantarflexion and decreased minimum dorsiflexion.
• Plantar cutaneous augmentation increased stance duty factor and decreased cycle duration.
• A notable after-effect on gait kinematics was observed post-stimulation, suggesting lasting changes.

Conclusions:

• Closed-loop distal-tibial nerve stimulation effectively augments ankle plantarflexion during walking.
• This method holds promise for developing therapeutic strategies to improve gait in neurological disorders.
• The observed after-effects indicate potential for long-term gait rehabilitation.