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

Electromechanical delay during knee extensor contractions.

E J Vos1, J Harlaar, G J van Ingen Schenau

  • 1Faculty of Human Movement Sciences, Department of Rehabilitation Medicine, Free University.

Medicine and Science in Sports and Exercise
|October 1, 1991
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

The interaction between muscle pathophysiology, body mass, walking speed and ankle foot orthosis stiffness on walking energy cost: a predictive simulation study.

Journal of neuroengineering and rehabilitation·2023
Same author

Interacting effects of AFO stiffness, neutral angle and footplate stiffness on gait in case of plantarflexor weakness: A predictive simulation study.

Journal of biomechanics·2023
Same author

Total knee arthroplasty improves gait adaptability in osteoarthritis patients; a pilot study.

Journal of orthopaedics·2022
Same author

Osteoarthritis year in review 2021: mechanics.

Osteoarthritis and cartilage·2022
Same author

Energy cost optimized dorsal leaf ankle-foot-orthoses reduce impact forces on the contralateral leg in people with unilateral plantar flexor weakness.

Gait & posture·2021
Same author

Limited knee extension during gait after total knee arthroplasty is related to a low Oxford Knee Score.

The Knee·2021
Same journal

Cardiorespiratory Fitness and Age-Related Decline in Kidney Function among Individuals with Preserved Kidney Health: The Aging Kidney Study.

Medicine and science in sports and exercise·2026
Same journal

Objectively Measured Cardiorespiratory Fitness as a Potential Biomarker for Alzheimer's Disease Risk in Older Adults: Evidence from the Generation 100 Study.

Medicine and science in sports and exercise·2026
Same journal

The Effects of Eight-Week Traditional Aerobic Exercise and Exergaming on Dual-Task Performance and Prefrontal Cortex Activation in Older Adults.

Medicine and science in sports and exercise·2026
Same journal

The Impact of Cardiorespiratory Fitness on Cytotoxic T Cell Metabolism and Function.

Medicine and science in sports and exercise·2026
Same journal

Female Athletes Through the Lifespan: Clinical Considerations and a Call for Comprehensive Sports Medicine Healthcare.

Medicine and science in sports and exercise·2026
Same journal

Artificial Intelligence in Exercise Science and Sports Medicine.

Medicine and science in sports and exercise·2026
See all related articles

Electromechanical delay (EMD) in knee extensors is influenced by force levels. Lower force (50% MVC) resulted in longer EMD compared to higher force (70% MVC), indicating force-dependent neuromuscular control.

Area of Science:

  • Biomechanics
  • Human Physiology
  • Neuromuscular Function

Background:

  • Electromechanical delay (EMD) is the time lag between muscle activation and force production.
  • Understanding EMD is crucial for analyzing muscle function and optimizing athletic performance.
  • Factors influencing EMD, such as force, fatigue, and contraction type, require further investigation.

Purpose of the Study:

  • To investigate the magnitude of electromechanical delay (EMD).
  • To determine the dependence of EMD on muscle type, contraction type, fatigue, force level, initial muscle length, and contraction velocity.
  • To analyze EMD in knee extensor muscles under various contractile conditions.

Main Methods:

  • Voluntary knee extensor torques and surface EMG activity were measured in seven male subjects.

Related Experiment Videos

  • EMD was calculated using a cross-correlation technique with a bidirectional low-pass filter for EMG processing.
  • Experiments included isometric contractions at different force levels (50% and 70% MVC) and knee angles, maximal isokinetic contractions during shortening and lengthening at varying velocities, and a submaximal isometric fatigue test.

    • Main Results:

    • A significant main effect of force level on EMD was observed.
    • EMD values were significantly longer at 50% MVC (107 ms) compared to 70% MVC (98 ms).

    Conclusions:

    • The level of voluntary force significantly influences electromechanical delay in knee extensor muscles.
    • Lower force outputs are associated with a greater time lag between muscle activation and force generation.
    • These findings contribute to a better understanding of neuromuscular control and force production dynamics.