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 Experiment Videos

Relation between electromyogram and force in fatigue.

H Kranz, J F Cassell, G F Inbar

    Journal of Applied Physiology (Bethesda, Md. : 1985)
    |September 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Related Concept Videos

    You might also read

    Related Articles

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

    Sort by
    Same author

    Coloring of PLGA implants to better understand the underlying drug release mechanisms.

    International journal of pharmaceutics·2019
    Same author

    Often neglected: PLGA/PLA swelling orchestrates drug release: HME implants.

    Journal of controlled release : official journal of the Controlled Release Society·2019
    Same author

    In-situ forming PLGA implants for intraocular dexamethasone delivery.

    International journal of pharmaceutics·2018
    Same author

    Optimization of pulse duration and pulse charge during transcutaneous electrical nerve stimulation.

    The Australian journal of physiotherapy·2014
    Same author

    About cochlear amusia; Analysis of hearing disorders, particularly sound, in a case of bilateral labyrinth injury.

    Der Nervenarzt·2010
    Same author

    Evaluation of the drug release patterns and long term stability of aqueous and organic coated pellets by using blends of enteric and gastrointestinal insoluble polymers.

    International journal of pharmaceutics·2009
    Same journal

    Thoroughbred horses susceptible to Recurrent Exertional Rhabdomyolysis have elevated skeletal muscle mitochondrial capacities.

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

    Change in Neutrophil-to-Lymphocyte Ratio after acute and chronic exercise: A Systematic Review and Meta-Analysis.

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

    Ankylosing spondylitis and muscle sympathetic nerve activity: a case study.

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

    Intracranial vasomotor and blood flow responses to light intensity aerobic exercise in young adults: a 4D flow MRI study.

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

    Comparative assessments of the COSMED adaptive mixing chamber vs. breath-by-breath methods for oxygen uptake measurements in recreationally active adults.

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

    Can we assess exercise metabolism from skin? Metabolomic profiles in skin dialysate collected during exercise.

    Journal of applied physiology (Bethesda, Md. : 1985)·2026
    See all related articles

    Surface electromyogram (SEMG) signals and muscle force were analyzed during maximal voluntary contractions (MVC). Findings reveal a decrease in motoneuron drive during MVC, impacting the SEMG-force relationship.

    Area of Science:

    • Neuroscience
    • Biomechanics
    • Motor Control

    Background:

    • The relationship between surface electromyogram (SEMG) signals and muscle force is crucial for understanding motor control.
    • Maximal voluntary contraction (MVC) is a common paradigm to study neuromuscular function.

    Purpose of the Study:

    • To investigate the relationship between SEMG and force during isometric MVC of elbow flexors.
    • To determine the factors contributing to the deviation between SEMG amplitude and force over time.

    Main Methods:

    • Isometric MVC of elbow flexors were performed by 18 subjects.
    • SEMG and compound action potentials (CAP) were recorded during repeated MVCs.
    • Analysis included median frequency (Fm) and root-mean-square amplitude of SEMG.

    Related Experiment Videos

    Main Results:

    • A decrease in Fm of SEMG and CAP was observed during MVC.
    • SEMG amplitude deviated from force over time (r = 0.40).
    • Correcting SEMG for Fm changes improved its correlation with force (r = 0.68), indicating reduced motoneuron drive.

    Conclusions:

    • Neuromuscular transmission remained intact during MVC.
    • A decline in motoneuron drive contributes to the force-SEMG relationship changes during sustained MVC.
    • The calculated motoneuron firing rate decreased significantly, consistent with motor adaptation mechanisms.