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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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Semi-automated Analysis of Mouse Skeletal Muscle Morphology and Fiber-type Composition
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Non-invasive Analysis of Fiber Type Composition in Lower Limb Skeletal Muscles Using Reduced Interference Rihaczek

Remya R Nair, Divya Sasidharan, Venugopal G

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |February 19, 2024
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    Surface electromyography analysis reveals distinct muscle fiber compositions. Instantaneous median frequency (IMDF) effectively differentiates muscle states and fiber types in Rectus femoris and Soleus muscles.

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    Area of Science:

    • Sports biomechanics
    • Biomedical engineering
    • Muscle physiology

    Background:

    • Muscle fiber composition significantly impacts force generation and endurance.
    • Understanding heterogeneous muscle composition is crucial in sports biomechanics and biomedicine.

    Purpose of the Study:

    • To analyze the fiber composition of Rectus femoris (type II dominant) and Soleus (type I dominant) muscles.
    • To investigate the non-fatigue (NF) and fatigue (F) states of these muscles using surface electromyography (SEMG).

    Main Methods:

    • Acquired isometric SEMG signals from 15 participants.
    • Processed signals using reduced interference Rihaczek distribution.
    • Extracted and analyzed Instantaneous Median Frequency (IMDF) from NF and F segments.

    Main Results:

    • Spectral power increased in lower frequencies for Rectus femoris and higher frequencies for Soleus during fatigue.
    • Soleus exhibited higher IMDF values than Rectus femoris in both NF and F states.
    • IMDF showed a 14% reduction in Rectus femoris and a 10% increase in Soleus during fatigue.

    Conclusions:

    • The extracted IMDF feature is sensitive and statistically significant (p<0.05) for differentiating muscle fiber types and states.
    • This method offers a non-invasive approach to analyze fiber type shifts related to athletic training and pathology.