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

A method for detecting functional weakness.

A J McComas, S Kereshi, J Quinlan

    Journal of Neurology, Neurosurgery, and Psychiatry
    |March 1, 1983
    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

    Omega-3 supplementation during unilateral resistance exercise training in older women: A within subject and double-blind placebo-controlled trial.

    Clinical nutrition ESPEN·2021
    Same author

    An international multidisciplinary consensus statement on the prevention of opioid-related harm in adult surgical patients.

    Anaesthesia·2020
    Same author

    Postoperative pain management: time to get back on track.

    Anaesthesia·2020
    Same author

    Nerve block site marking.

    Anaesthesia·2018
    Same author

    A double-blind placebo controlled trial into the impacts of HMB supplementation and exercise on free-living muscle protein synthesis, muscle mass and function, in older adults.

    Clinical nutrition (Edinburgh, Scotland)·2018
    Same author

    [Acute pain management in patients with drug dependence syndrome].

    Schmerz (Berlin, Germany)·2018
    Same journal

    Global epidemiology of amyotrophic lateral sclerosis: a systematic review and meta-analysis.

    Journal of neurology, neurosurgery, and psychiatry·2026
    Same journal

    Diagnostic accuracy of a two-cut-off approach using the FAQ/MMSE ratio and FAQ for clinical preselection of patients for anti-amyloid therapy.

    Journal of neurology, neurosurgery, and psychiatry·2026
    Same journal

    Cancer risk and mortality in patients with multiple sclerosis in Finland: a retrospective population-based cohort study.

    Journal of neurology, neurosurgery, and psychiatry·2026
    Same journal

    Visuospatial working memory in Huntington's disease: behavioural and structural brain correlates.

    Journal of neurology, neurosurgery, and psychiatry·2026
    Same journal

    Characteristics and outcomes in electric scooter-related traumatic brain injuries in Helsinki.

    Journal of neurology, neurosurgery, and psychiatry·2026
    Same journal

    Chronological ageing and ovarian reserve in MS: insights from anti-Müllerian hormone and disability progression.

    Journal of neurology, neurosurgery, and psychiatry·2026
    See all related articles

    A new electrophysiological method detects psychiatric-related muscle weakness. It identifies incomplete motor activation during voluntary contractions using a single muscle stimulus, revealing a twitch.

    Area of Science:

    • Electrophysiology
    • Psychiatry
    • Neuromuscular function

    Background:

    • Assessing muscle weakness of psychiatric origin presents diagnostic challenges.
    • Existing methods may not accurately differentiate between true weakness and volitional effort.

    Observation:

    • A novel electrophysiological technique is introduced.
    • This method involves applying a single indirect muscle stimulus during a maximal voluntary contraction.
    • The stimulus is interpolated to assess motor unit recruitment.

    Findings:

    • Incomplete motor activation is identified by a superimposed muscle twitch.
    • This twitch indicates a failure in the voluntary drive to fully activate the muscle.
    • The method provides objective evidence of neuromuscular underactivation.

    Related Experiment Videos

    Implications:

    • This technique offers a simple, objective tool for diagnosing psychiatric-related weakness.
    • It may aid in differentiating psychogenic weakness from organic neuromuscular disorders.
    • Further research can explore its clinical utility in psychiatric and neurological settings.