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Intra-Foot Energy Recycling Enhances Gait Economy in a Low-Profile Passive Foot Exoskeleton
Summary
This study introduces a passive foot exoskeleton that recycles energy within the foot, improving walking economy. The device reduces metabolic cost and muscle demand by assisting the metatarsophalangeal (MTP) joint.
Area of Science:
- Biomechanics
- Robotics
- Human-Computer Interaction
Background:
- Human gait relies on passive elastic mechanisms for energy recycling, largely unaddressed by current exoskeletons.
- Existing walking assistance exoskeletons primarily focus on the ankle joint, neglecting the foot's energy modulation capabilities.
Purpose of the Study:
- To develop and evaluate a low-profile passive foot exoskeleton for improved gait economy.
- To investigate intra-foot energy recycling for walking assistance.
- To assess the impact of metatarsophalangeal (MTP) joint assistance on metabolic cost and muscle activity.
Main Methods:
- Development of a passive foot exoskeleton with a hindfoot torsion spring and a metatarsophalangeal (MTP) joint clutch.
- Walking experiments with fifteen healthy male participants comparing the exoskeleton to mass-matched shoes.
- Analysis of metabolic cost, electromyography (EMG), and biomechanical data.
Main Results:
- The exoskeleton reduced net metabolic cost by 3.31% compared to shoes.
- Electromyography revealed reduced late-stance plantarflexor muscle activity.
- Biomechanical data confirmed temporally consistent assistance and effective intra-foot energy redirection.
Conclusions:
- MTP-targeted assistance, below the ankle, can reduce plantarflexor workload and enhance gait economy.
- The passive foot exoskeleton offers a novel paradigm for metabolically efficient walking assistance.
- The system provides a compact, standalone solution for unobtrusive gait enhancement.
