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Paradigms of Lower Extremity Electrical Stimulation Training After Spinal Cord Injury
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Paradigms of Lower Extremity Electrical Stimulation Training After Spinal Cord Injury

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[Effects of chronic low-frequency electrical stimulation of human knee extensor muscles exposed to static passive

B S Shenkman, E V Liubaeva, D V Popov

    Fiziologiia Cheloveka
    |March 11, 2006
    PubMed
    Abstract

    No abstract available in PubMed .

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    Muscle Stimulation Frequency01:22

    Muscle Stimulation Frequency

    The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
    Wave summation
    At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
    Relaxation of Skeletal Muscles01:29

    Relaxation of Skeletal Muscles

    The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
    When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open.

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