Adding adaptable toe stiffness affects energetic efficiency and dynamic behaviors of bipedal walking

Area of Science:

• Biomechanics
• Robotics
• Human Locomotion

Background:

• The toes' role in human walking is crucial for body support and forward motion control.
• Muscles and tendons surrounding toe joints facilitate these essential functions.

Purpose of the Study:

• To investigate the impact of toe joint mechanics on bipedal walking stability and energy efficiency.
• To understand how adaptable compliant toe joints influence locomotion dynamics.

Main Methods:

• A simple bipedal walking model with compliant ankle and toe joints (modeled as torsional springs) was utilized.
• Actuation patterns mimicked those observed in normal human walking.

Main Results:

• Adaptable compliant toe joints were found to improve walking stability and energy efficiency.
• Toe-generated plantar flexion moments post-heel-off stabilize the body and control forward motion.
• A multi-joint foot structure enhanced energy efficiency by reducing ankle joint energy consumption.

Conclusions:

• The study highlights the significant contribution of toes to stable and efficient human locomotion.
• Optimized toe actuation patterns can lead to smoother walking by reducing maximal ankle plantar flexion and promoting toe dorsiflexion.