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Related Concept Videos

Classification of Skeletal Muscle Fibers01:48

Classification of Skeletal Muscle Fibers

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Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
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Types of Skeletal Muscle Fibers01:32

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Skeletal muscles comprise various fibers, each with distinct characteristics and roles in movement and stability. They are mainly categorized into three types — fast-twitch, slow-twitch, and intermediate.
Fast-twitch fibers
Fast-twitch fibers, or Type II fibers, are designed for quick, powerful bursts of speed and strength. They reach peak tension within approximately 0.01 seconds following stimulation. Characterized by a large diameter and densely packed myofibrils, these fibers contain...
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Formation of Muscle Fibers from Myoblasts01:13

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De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription...
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Thermal Strain01:19

Thermal Strain

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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Shearing Strain01:20

Shearing Strain

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The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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Measurements of Strain

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Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Related Experiment Video

Updated: Jan 22, 2026

High-Throughput Contractile Measurements of Hydrogel-Embedded Intact Mouse Muscle Fibers Using an Optics-Based System
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High-Throughput Contractile Measurements of Hydrogel-Embedded Intact Mouse Muscle Fibers Using an Optics-Based System

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Strain-programmable fiber-based artificial muscle.

Mehmet Kanik1,2, Sirma Orguc3, Georgios Varnavides1,2,4

  • 1Research Laboratory of Electronics, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.

Science (New York, N.Y.)
|July 13, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed scalable artificial muscles using a novel fiber-drawing technique. These powerful, programmable actuators offer tunable dimensions and advanced feedback for robotics and biomedical applications.

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Area of Science:

  • Materials Science
  • Robotics Engineering
  • Biomedical Engineering

Background:

  • Polymer-based actuators are crucial for robotics, haptics, and prosthetics.
  • Current challenges include scalable production and tunable dimensions for artificial muscles.

Purpose of the Study:

  • To develop a scalable method for producing artificial muscles with tunable dimensions.
  • To create high-performance fiber-based actuators with enhanced control and feedback capabilities.

Main Methods:

  • Utilized a high-throughput iterative fiber-drawing technique.
  • Fabricated strain-programmable artificial muscles with dimensions across three orders of magnitude.
  • Integrated conductive nanowire meshes for piezoresistive strain feedback.

Main Results:

  • Achieved thermally and optically controllable fiber-based actuators.
  • Demonstrated actuators capable of lifting over 650 times their own weight.
  • Exhibited actuators withstanding strains exceeding 1000% and >10^5 deformation cycles.
  • Integrated nanowire meshes provided reliable strain feedback and long-term resilience.

Conclusions:

  • The scalable fiber-drawing technique enables production of artificial muscles with tunable dimensions.
  • These artificial muscles exhibit exceptional strength, strain tolerance, and responsiveness.
  • The technology holds significant potential for advancing robotics, haptics, prosthetics, and biomedical applications.