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Motor Unit Stimulation

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...

Muscle Contraction

Muscle Contraction

Muscle Contraction

Muscle Contraction

In skeletal muscles, acetylcholine is released by nerve terminals at the motor endplate—the point of synaptic communication between motor neurons and muscle fibers. The binding of acetylcholine to its receptors on the sarcolemma allows entry of sodium ions into the cell and triggers an action potential in the muscle cell. Thus, electrical signals from the brain are transmitted to the muscle. Subsequently, the enzyme acetylcholinesterase breaks down acetylcholine to prevent excessive...

Actin and Myosin in Muscle Contraction

Actin and Myosin in Muscle Contraction

Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...

The Role of Actin and Myosin in Non-muscle Cells

The Role of Actin and Myosin in Non-muscle Cells

Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They are held...

Excitation-Contraction Coupling in Skeletal Muscles

Excitation-Contraction Coupling in Skeletal Muscles

Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
When an action...

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Development of a Contraction Force Control Method for Bioactuators Using a Muscle Contraction Model.

Mutsuki Hagiwara¹, Wataru Hijikata¹

¹School of Engineering, Institute of Science Tokyo, Tokyo, Japan.

|November 18, 2025

Summary

Researchers developed a precise control method for bioactuators using skeletal muscle. This advancement enables bioactuators to function like industrial actuators, opening doors for self-growing exoskeletons and long-lasting medical devices.

Keywords:

bioactuator contraction force control model-based control muscle contraction model

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Procedures for Rat in situ Skeletal Muscle Contractile Properties

Procedures for Rat in situ Skeletal Muscle Contractile Properties

Published on: October 15, 2011

Area of Science:

Biomedical Engineering
Robotics
Muscle Physiology

Background:

Bioactuators combine cultured skeletal muscle with artificial lattices, offering flexibility and biological functions like self-growth and self-repair.
Potential applications include self-growing exoskeletons and semi-permanent power generation for implantable medical devices.

Purpose of the Study:

To develop a precise control method for bioactuator contraction force.
To enable bioactuators to be controlled similarly to existing industrial actuators.

Main Methods:

Proposed a stimulation voltage calculation method using an optimization algorithm based on muscle contraction models.
Developed a feedback control system to minimize errors against reference forces.
Experimentally evaluated the control method using a bioactuator with extracted toad muscle.

Main Results:

Demonstrated precise control of muscle contraction force.
Showed that feedback control effectively reduces errors from changing muscle characteristics.
Validated that bioactuators can be controlled like conventional industrial actuators.

Conclusions:

The proposed method enables precise and reliable control of bioactuators.
This control strategy is crucial for engineering applications of bioactuators.
Bioactuators show promise for advanced applications in robotics and medicine.