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As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
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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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Updated: Nov 12, 2025

Immunolabelling Myofiber Degeneration in Muscle Biopsies
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Muscle Atrophy Classification: The Need for a Pathway-Driven Approach.

John Zizzo1

  • 1University of Miami Miller School of Medicine, Miami, FL, 33136, United States.

Current Pharmaceutical Design
|March 17, 2021
PubMed
Summary
This summary is machine-generated.

Muscle atrophy, or muscle wasting, reduces strength and daily function. This review categorizes atrophy into physiologic, pathologic, and neurogenic types, highlighting known mechanisms and the need for further research.

Keywords:
Muscle atrophyagingcorticosteroidsphysical inactivitystimulus.ubiquitin-proteasome system

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Area of Science:

  • Biomedical Science
  • Muscle Physiology
  • Cellular Biology

Background:

  • Muscle atrophy, characterized by reduced muscle strength and impaired function, is a well-documented condition.
  • It is commonly linked to disuse, aging, and nerve damage, impacting daily activities.
  • Existing research categorizes atrophy into physiologic, pathologic, and neurogenic subtypes, with varying degrees of understood mechanisms.

Purpose of the Study:

  • To review the underlying mechanisms of different muscle atrophy subtypes.
  • To emphasize the current gaps in understanding signaling cascades for various atrophy causes.
  • To highlight the necessity for improved classification and identification of muscle atrophy.

Main Methods:

  • Literature review of existing studies on muscle atrophy.
  • Analysis of categorized subtypes: physiologic, pathologic, and neurogenic atrophy.
  • Discussion of elucidated and unelucidated signaling pathways involved in muscle wasting.

Main Results:

  • Physiologic atrophy stems from general skeletal muscle underuse (e.g., immobilization).
  • Pathologic atrophy involves loss of stimulus to specific regions, such as during aging.
  • Neurogenic atrophy arises from nerve damage affecting muscle innervation (e.g., Spinal Muscular Atrophy, Guillain-Barré Syndrome).
  • While mechanisms like the ubiquitin-proteasome system are known, many causes (e.g., burns, arthritis) involve unelucidated pathways.

Conclusions:

  • Understanding the mechanisms of muscle atrophy subtypes is crucial for targeted interventions.
  • Further research is essential to elucidate signaling cascades in understudied causes of muscle atrophy.
  • Accurate classification and identification of muscle atrophy subtypes require continued investigation.