Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Motor Units01:13

Motor Units

14.4K
The motor unit is a fundamental component of the neuromuscular system and plays a crucial role in coordinating muscle contractions. It consists of a somatic motor neuron, which connects and controls multiple skeletal muscle fibers, forming a single functional segment. The axon of the motor neuron branches out and establishes synaptic connections known as neuromuscular junctions with individual muscle fibers within the motor unit.
Motor units come in different sizes, with smaller units...
14.4K
Motor Units00:46

Motor Units

53.8K
A motor unit consists of two main components: a single efferent motor neuron (i.e., a neuron that carries impulses away from the central nervous system) and all of the muscle fibers it innervates. The motor neuron may innervate multiple muscle fibers, which are single cells, but only one motor neuron innervates a single muscle fiber.
53.8K
Motor Unit Stimulation01:20

Motor Unit Stimulation

4.7K
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...
4.7K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Investigation of a Low-cost Portable Inline Dynamometer for Measuring Isometric Knee Extensor Strength.

International journal of sports physical therapy·2026
Same author

Effects of electrical cutaneous stimulation of the foot sole on voluntary plantarflexion rate of torque development after fatigue in males.

European journal of applied physiology·2026
Same author

Stretch-shortening cycles mitigate single muscle fibre power deficits following a two-week immobilization of the rat hindlimb.

Journal of muscle research and cell motility·2026
Same author

Characterizing motor unit firing rates in the human erector spinae.

Journal of applied physiology (Bethesda, Md. : 1985)·2026
Same author

Stretch-shortening cycle performance enhancement is not affected by initial pre-activation muscle length in permeabilized single muscle fibres.

Journal of biomechanics·2026
Same author

Load- and frequency-dependent impairments to isotonic power are greater than isometric torque following concentric-eccentric fatiguing contractions in humans.

Journal of applied physiology (Bethesda, Md. : 1985)·2026
Same journal

Join AANEM.

Muscle & nerve·2026
Same journal

Targeted Muscle Reinnervation for Management and Prevention of Symptomatic Neuroma.

Muscle & nerve·2026
Same journal

AANEM News & Insights.

Muscle & nerve·2026
Same journal

Fat-Fraction Quantification Using Three-Point Dixon Technique in Duchenne Muscular Dystrophy and Its Correlation With Clinical Progression and Genotypic Characteristics: A Single Centre One-Year Prospective Study.

Muscle & nerve·2026
Same journal

Characterizing Combined Central and Peripheral Demyelination-Insights From a Multimodal Comparison With Chronic Inflammatory Demyelinating Polyneuropathy and Multiple Sclerosis.

Muscle & nerve·2026
Same journal

Electrical Modalities in the Rehabilitation of Peripheral Nerve Injuries: State of the Literature and Current Clinical Applications.

Muscle & nerve·2026
See all related articles

Related Experiment Video

Updated: May 7, 2026

Electrophysiological Motor Unit Number Estimation MUNE Measuring Compound Muscle Action Potential CMAP in Mouse Hindlimb Muscles
09:07

Electrophysiological Motor Unit Number Estimation MUNE Measuring Compound Muscle Action Potential CMAP in Mouse Hindlimb Muscles

Published on: September 25, 2015

23.9K

Anconeus motor unit number estimates using decomposition-based quantitative electromyography.

Daniel E S Stevens1, Brad Harwood, Geoffrey A Power

  • 1Canadian Centre for Activity and Aging, School of Kinesiology, Faculty of Health Sciences, University of Western Ontario, London, Ontario, Canada.

Muscle & Nerve
|October 15, 2013
PubMed
Summary
This summary is machine-generated.

Motor unit number estimates (MUNE) in the anconeus muscle are feasible at higher activation levels. This study shows DE-STA can provide representative motor unit pool samples at 50% MVC.

Keywords:
MUNE, triceps brachiielbow extensors, EMGforce-EMG relationship

More Related Videos

Author Spotlight: Studying Neuromuscular Responses and Motor Neuron Plasticity in Neurodegenerative Diseases
06:08

Author Spotlight: Studying Neuromuscular Responses and Motor Neuron Plasticity in Neurodegenerative Diseases

Published on: April 19, 2024

904
CMAP Scan MUNE MScan - A Novel Motor Unit Number Estimation MUNE Method
08:25

CMAP Scan MUNE MScan - A Novel Motor Unit Number Estimation MUNE Method

Published on: June 7, 2018

11.9K

Related Experiment Videos

Last Updated: May 7, 2026

Electrophysiological Motor Unit Number Estimation MUNE Measuring Compound Muscle Action Potential CMAP in Mouse Hindlimb Muscles
09:07

Electrophysiological Motor Unit Number Estimation MUNE Measuring Compound Muscle Action Potential CMAP in Mouse Hindlimb Muscles

Published on: September 25, 2015

23.9K
Author Spotlight: Studying Neuromuscular Responses and Motor Neuron Plasticity in Neurodegenerative Diseases
06:08

Author Spotlight: Studying Neuromuscular Responses and Motor Neuron Plasticity in Neurodegenerative Diseases

Published on: April 19, 2024

904
CMAP Scan MUNE MScan - A Novel Motor Unit Number Estimation MUNE Method
08:25

CMAP Scan MUNE MScan - A Novel Motor Unit Number Estimation MUNE Method

Published on: June 7, 2018

11.9K

Area of Science:

  • Neuromuscular physiology
  • Motor control research
  • Electromyography applications

Background:

  • Motor unit number estimates (MUNEs) are crucial for assessing neuromuscular health in various conditions.
  • Current methods using decomposition-enhanced spike-triggered averaging (DE-STA) are limited to lower muscle activation levels (around 30% MVC).
  • This limitation restricts the ability to sample the entire motor unit pool in most muscles.

Purpose of the Study:

  • To investigate the feasibility of performing anconeus MUNEs using DE-STA at higher muscle activation levels (up to 50% MVC).
  • To determine if the anconeus muscle allows for a representative sampling of the motor unit pool at these higher forces.

Main Methods:

  • The study involved 10 healthy men (average age 25 years).
  • Anconeus MUNEs were assessed using DE-STA at 10%, 30%, and 50% of root-mean-square of maximum voluntary contraction (RMS(MVC)).

Main Results:

  • Anconeus motor unit potentials showed increasing surface-detected motor unit potential (S-MUP) amplitudes with force (100 μV at 10%, 145 μV at 30%, 235 μV at 50% RMS(MVC)).
  • Calculated MUNEs decreased with increasing force (58 at 10%, 38 at 30%, 25 at 50% RMS(MVC)).

Conclusions:

  • Force-electromyography relationships for elbow extensors indicate that the anconeus motor unit pool is fully recruited at 50% RMS(MVC).
  • This suggests that DE-STA can yield representative MUNE values for the anconeus muscle at 50% MVC.