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Related Concept Videos

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...
Neuromuscular Junction And Blockade01:29

Neuromuscular Junction And Blockade

The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions01:27

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions

Nondepolarizing neuromuscular blockers prevent the membrane depolarization of muscle cells and inhibit muscle contraction. These are usually administered with anesthetics to achieve complete muscle relaxation. Upon administration, these drugs first block the small, rapidly contracting muscles of the face and hands, followed by the larger muscles of the trunk and the intercostal muscles. The diaphragm is the last muscle to be affected.
Although all competitive neuromuscular blockers are designed...
Depolarizing Blockers: Mechanism of Action01:28

Depolarizing Blockers: Mechanism of Action

Depolarizing blockers act on skeletal muscle fibers' membranes and induce their depolarization. Most depolarizing blockers have two quaternary N+ atoms that bind the nicotinic acetylcholine receptors and cause neuromuscular blockade within minutes.
Succinylcholine is the most commonly used depolarizing blocker. Chemically, it constitutes two molecules of acetylcholine joined together by an acetate methyl group. They act on the receptors in the same way as acetylcholine. Because succinylcholine...
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...

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Related Experiment Video

Updated: Jun 9, 2026

High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation
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Published on: July 29, 2011

Muscle-selective block using intrafascicular high-frequency alternating current.

Brett R Dowden1, Heather A C Wark, Richard A Normann

  • 1Department of Bioengineering, University of Utah, Salt Lake City, Utah 84112, USA.

Muscle & Nerve
|September 1, 2010
PubMed
Summary
This summary is machine-generated.

High-frequency alternating current (HFAC) can selectively block targeted muscle activation via intrafascicular electrodes. This method allows precise control over muscle contractions without affecting other muscles.

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Last Updated: Jun 9, 2026

High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation
09:17

High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation

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Isolation of Human Atrial Myocytes for Simultaneous Measurements of Ca2+ Transients and Membrane Currents
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Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles
14:02

Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles

Published on: November 1, 2012

Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Motor Control

Background:

  • Peripheral nerve stimulation is crucial for understanding and controlling muscle activity.
  • Selective modulation of specific muscles remains a challenge in neuroprosthetics and rehabilitation.

Purpose of the Study:

  • To evaluate the efficacy of intrafascicular high-frequency alternating current (HFAC) for selective muscle block.
  • To determine if HFAC can abolish targeted muscle activation without impacting adjacent muscles.

Main Methods:

  • Implantation of Utah slanted electrode arrays (USEAs) into feline sciatic nerves.
  • Delivery of HFAC via individual USEA electrodes to block nerve signals.
  • Monitoring of muscle responses using evoked electromyograms (EMGs) and force measurements.

Main Results:

  • HFAC successfully and selectively abolished evoked muscle activity in targeted muscles.
  • Selective neuromuscular blocks were achieved with HFAC frequencies between 500-8000 Hz.
  • Selective nerve conduction block was demonstrated using 16-kHz HFAC in one animal.

Conclusions:

  • Intrafascicular HFAC provides a method for selective muscle blockade.
  • This technique allows independent control over muscle activation, offering potential for advanced neuroprosthetic applications.