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Overview of Skeletal Muscle01:15

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Skeletal muscles are composed of a bundle of muscle fibers and are attached to bones through tendons. Each skeletal muscle fiber is a single muscle cell. The sarcolemma, the plasma membrane of a skeletal muscle cell, consists of a lipid bilayer and glycocalyx that supports muscle fibers. The sarcolemma extends into the muscle cells to form tubular structures called transverse or T-tubules. Each side of the T-tubules consists of a membrane-bound structure called the sarcoplasmic reticulum,...
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Classification of Skeletal Muscle Fibers01:48

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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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Skeletal muscle is the most abundant type of muscle in the body. Tendons are the connective tissue that attaches skeletal muscle to bones. Skeletal muscles pull on tendons, which in turn pull on bones to carry out voluntary movements.
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Smooth muscle tissue is a type of muscle tissue that can be found lining various vital organs in the human body, including the lungs, blood vessels, digestive tract, and respiratory tract. This type of tissue is responsible for regulating the movements of these organs, playing crucial roles in the functioning of various systems, including the vascular, digestive, respiratory, and urinary systems.
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Updated: Sep 14, 2025

Assessing Functional Metrics of Skeletal Muscle Health in Human Skeletal Muscle Microtissues
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Porous-Structure Flexible Muscle Sensor for Monitoring Muscle Function and Mass.

Hongyu Zhang1, Keer Wang1, Jiao Suo1

  • 1Department of Mechanical Engineering, City University of Hong Kong, Hong Kong 999077, China.

ACS Sensors
|July 24, 2025
PubMed
Summary
This summary is machine-generated.

A new flexible sensor offers a cost-effective way to monitor muscle function and mass daily. This wearable device aids in the early detection of age-related muscle loss and disorders like sarcopenia.

Keywords:
CNT/PDMS flexible muscle sensorYOLO-V5mmachine learningmuscle functionmuscle mass

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Area of Science:

  • Biomedical Engineering
  • Wearable Technology
  • Gerontology

Background:

  • Muscle function and composition are key indicators of age-related health.
  • Current assessment methods are often complex, expensive, and inaccessible for daily monitoring.
  • Early detection of muscle-related issues is crucial for timely intervention.

Purpose of the Study:

  • To develop a cost-effective, portable, and user-friendly sensor for daily muscle function and mass assessment.
  • To evaluate the sensor's performance in distinguishing between elderly and young individuals.
  • To assess the sensor's capability in predicting relative skeletal muscle mass index.

Main Methods:

  • A novel porous-structured (CNT/PDMS nanocomposite) flexible piezoresistive sensor was designed and fabricated.
  • The sensor was tested for its detection range, sensitivity, stability, and performance under varying conditions (temperature, perspiration).
  • Gait data was collected from 23 participants (elderly and young) wearing the sensor on the gastrocnemius muscle, with machine learning models applied for analysis.

Main Results:

  • The sensor demonstrated a linear detection range of 0-39 kPa with dual-stage sensitivities and maintained stable performance for over a week.
  • Supervised learning achieved 93.48% accuracy in distinguishing between age groups.
  • An Adaboost regression model predicted relative skeletal muscle mass index with a mean error of 2.8%.

Conclusions:

  • The developed flexible sensor is a promising tool for the daily, noninvasive monitoring of muscle function and mass.
  • It enables early detection and prevention of sarcopenia and other age-related muscle disorders.
  • The sensor's low cost, user-friendliness, and portability make it suitable for clinical, sports, and home environments.