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Related Concept Videos

Motor Unit Stimulation01:20

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
Muscle Stimulation Frequency01:22

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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
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Generation of Action Potential in Skeletal Muscles01:24

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Design Example: Frog Muscle Response01:14

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Overview of Muscle Tissues01:25

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Elasticity
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Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

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Related Experiment Video

Updated: May 15, 2026

Real Time and Repeated Measurement of Skeletal Muscle Growth in Individual Live Zebrafish Subjected to Altered Electrical Activity
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Variability in muscle adaptation to electrical stimulation.

M A Minetto1, A Botter, O Bottinelli

  • 1Department of Internal Medicine, Division of Endocrinology, Diabetology and -Metabolism, Molinette Hospital, University of Turin, Turin, Italy. marco.minetto@unito.it

International Journal of Sports Medicine
|January 9, 2013
PubMed
Summary
This summary is machine-generated.

Neuromuscular electrical stimulation (NMES) alters myosin heavy chain (MHC) phenotypes and increases muscle force and conduction velocity. However, MHC distribution does not correlate with muscle fibre conduction velocity (MFCV).

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Last Updated: May 15, 2026

Real Time and Repeated Measurement of Skeletal Muscle Growth in Individual Live Zebrafish Subjected to Altered Electrical Activity
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07:53

Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation

Published on: September 13, 2015

Area of Science:

  • Muscle physiology
  • Neuromuscular electrical stimulation research
  • Skeletal muscle plasticity

Background:

  • Skeletal muscle adaptations to training involve changes in myosin heavy chain (MHC) composition.
  • Muscle fibre conduction velocity (MFCV) is an electrophysiological measure influenced by muscle fibre characteristics.

Purpose of the Study:

  • To investigate myosin heavy chain (MHC) phenotype plasticity after neuromuscular electrical stimulation (NMES).
  • To assess the correlation between MHC isoform distribution and muscle fibre conduction velocity (MFCV).

Main Methods:

  • 14 men underwent 24 sessions of quadriceps NMES.
  • Vastus lateralis muscle biopsies and neuromuscular tests were performed pre- and post-training.
  • Myosin heavy chain (MHC) isoform distribution and muscle fibre conduction velocity (MFCV) were analyzed.

Main Results:

  • NMES significantly increased quadriceps maximal force, vastus lateralis thickness, and MFCV in both vastus lateralis and medialis.
  • A wide spectrum of MHC isoform adaptations was observed, including fast-to-slow transitions and shifts toward MHC-2A and MHC-2X.
  • No significant correlation was found between MHC-2 relative content and vastus lateralis MFCV post-training.

Conclusions:

  • NMES induces significant adaptations in MHC composition, muscle force, thickness, and MFCV.
  • MHC isoform distribution is not correlated with MFCV, suggesting MFCV cannot estimate fibre type proportions.