Contraction model of skeletal muscle driven by external electrical stimulation-Proposal and Identification

Area of Science:

• Biomedical Engineering
• Robotics
• Muscle Physiology

Background:

• Biohybrid actuators integrate biological muscle with artificial structures, offering self-growth and self-repair capabilities.
• Developing model-based design and control for these actuators requires a fundamental understanding of muscle contraction dynamics.

Purpose of the Study:

• To develop and validate a comprehensive muscle contraction model for biohybrid actuators.
• To establish a foundational model for future advancements in biohybrid actuator technology.

Main Methods:

• A novel muscle contraction model was created, integrating electrical, physiological, and mechanical dynamic characteristics.
• The model simulates the process from electrical stimulation to calcium ion release and subsequent force generation.
• Model validation was performed under varying conditions, including tetanus, incomplete tetanus, and altered muscle lengths.

Main Results:

• The proposed model successfully simulated muscle contraction dynamics.
• Simulated contraction forces closely matched experimentally measured forces from toad gastrocnemius muscle.
• The model demonstrated accuracy across different stimulation states and muscle lengths.

Conclusions:

• The developed muscle contraction model provides a crucial first step for model-based design and control of biohybrid actuators.
• This research offers a validated foundational model for soft and flexible biohybrid actuators in medical and assistive applications.