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

Contraction specific changes in passive torque in human skeletal muscle

S P Magnusson1, E B Simonsen, P Aagaard

  • 1Team Danmark Test Centre, Rigshospitalet, Copenhagen, Denmark.

Acta Physiologica Scandinavica
|December 1, 1995
PubMed
Summary

Prior muscle contractions alter hamstring passive torque, with concentric contractions reducing it. Electromyographic activity did not explain these changes, indicating contraction-specific effects on muscle properties.

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

Tendon's 'first aid' response - new insights into acute tendon molecular reprogramming after rupture.

The Journal of physiology·2025
Same author

Lower basal and postprandial muscle protein synthesis after 2 weeks single-leg immobilization in older men: No protective effect of anti-inflammatory medication.

Physiological reports·2024
Same author

Acute loading has minor influence on human articular cartilage gene expression and glycosaminoglycan composition in late-stage knee osteoarthritis: a randomised controlled trial.

Osteoarthritis and cartilage·2023
Same author

The regional turnover of cartilage collagen matrix in late-stage human knee osteoarthritis.

Osteoarthritis and cartilage·2022
Same author

Effects of genipin crosslinking on mechanical cell-matrix interaction in 3D engineered tendon constructs.

Journal of the mechanical behavior of biomedical materials·2021
Same author

Hoof conformation in Icelandic competition horses and its interrelationship with hoof pathologies and tölt performance.

Veterinary journal (London, England : 1997)·2020

Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Muscle Physiology

Background:

  • Understanding how muscle contractions affect passive properties is crucial for injury prevention and rehabilitation.
  • Previous research has explored the effects of stretching on muscle torque, but the specific influence of prior contraction type remains less clear.

Purpose of the Study:

  • To investigate the acute effects of maximal repetitive concentric and eccentric hamstring contractions on passive torque and electromyographic (EMG) response during passive static stretching.
  • To determine if contraction mode influences passive torque and EMG activity post-contraction.

Main Methods:

  • Ten subjects underwent passive knee extension tests to measure hamstring passive torque using a dynamometer.
  • Electromyographic activity of the hamstring muscles was recorded simultaneously during a 90-second passive stretch.

Related Experiment Videos

  • The study compared torque and EMG responses before and after maximal concentric or eccentric contractions on separate days.

    • Main Results:

    • Passive torque declined significantly (30-35%) during the 90s stretch regardless of prior contraction mode.
    • Passive peak and final torques were significantly lower after concentric contractions but not after eccentric contractions.
    • Low-level EMG activity during stretching remained unchanged after both contraction types.

    Conclusions:

    • Acute maximal concentric contractions specifically alter passive torque in human skeletal muscle, an effect not explained by EMG activity.
    • Eccentric contractions did not significantly alter passive torque compared to controls.
    • A single 90-second stretch does not affect passive torque 45 minutes later.