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

Electromyography reliability in maximal and submaximal isometric contractions.

J F Yang, D A Winter

    Archives of Physical Medicine and Rehabilitation
    |September 1, 1983
    PubMed
    Summary

    This study found that submaximal isometric contractions offer more reliable surface electromyography (EMG) measurements compared to maximum voluntary contractions (MVC). Understanding this measurement error is crucial for accurate biomechanical analysis.

    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

    [Survey on the current status of hospitalized heart failure patients in China, 2023-2024].

    Zhonghua xin xue guan bing za zhi·2026
    Same author

    Curcumin ameliorates experimentally induced knee osteoarthritis in rats <i>via</i> regulation of synovial inflammatory.

    Journal of physiology and pharmacology : an official journal of the Polish Physiological Society·2025
    Same author

    [A brief introduction of the new burnout assessment tool (BAT)].

    Zhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases·2025
    Same author

    [Reliability and validity study of the short version of the Chinese version of the Burnout Assessment Tool (BAT-12)].

    Zhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases·2025
    Same author

    [Reassessing the scope of real-world data applications and the value of real-world evidence].

    Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi·2025
    Same author

    [Short-term efficacy of mid-urethral sling with autologous fascia lata sling in the treatment of stress urinary incontinence].

    Zhonghua fu chan ke za zhi·2025

    Area of Science:

    • Biomechanics
    • Neuroscience
    • Physiology

    Background:

    • Surface electromyography (EMG) is a common tool for assessing muscle activity.
    • Reliability of EMG measurements is critical for accurate interpretation of muscle function.
    • Variability in EMG data can arise from within-day and between-day testing conditions.

    Purpose of the Study:

    • To evaluate the reliability of average surface electromyography (EMG) measurements.
    • To compare the reliability of submaximal versus maximal isometric contractions.
    • To quantify within-day and between-day variability in EMG data.

    Main Methods:

    • Nine subjects performed maximal voluntary contractions (MVC) and submaximal isometric contractions at 30% and 50% MVC.
    • EMG signals from the triceps were processed (rectified, filtered) and normalized to force output.

    Related Experiment Videos

  • Reliability was assessed using intraclass correlation coefficients (R) and coefficient of variation (CV).

    • Main Results:

    • Intraclass correlation coefficients (R) were significantly higher for submaximal contractions compared to 100% MVC.
    • Within-day coefficient of variation (CV) ranged from 8% to 10% across all contraction levels.
    • Between-day variability (12%-16%) was consistently higher than within-day variability (8%-10%).

    Conclusions:

    • Submaximal isometric contractions provide more reliable average surface EMG data than maximal contractions.
    • Substantial measurement error exists in surface EMG, necessitating its inclusion in statistical analyses.
    • The findings support the use of submaximal contractions for more consistent EMG assessments.