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

Constant vs variable resistance knee extension training.

R J Manning1, J E Graves, D M Carpenter

  • 1Center for Exercise Science, College of Medicine, University of Florida, Gainesville 32611.

Medicine and Science in Sports and Exercise
|June 1, 1990
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

A novel description of AT deficiency in hospitalized COVID-19 patients.

European review for medical and pharmacological sciences·2025
Same author

Rapid and selective quantitative colourimetric analysis of nitrite in water using a S-Nitrosothiol based method.

Water research X·2024
Same author

Ultrasonic preparation, stability and thermal conductivity of a capped copper-methanol nanofluid.

Ultrasonics sonochemistry·2019
Same author

Distribution of subcutaneous fat and muscle thicknesses in young and middle-aged women.

American journal of human biology : the official journal of the Human Biology Council·2017
Same author

Body fat and muscle thickness in Japanese and Caucasian females.

American journal of human biology : the official journal of the Human Biology Council·2017
Same author

Reliability of B-mode ultrasound for the measurement of body fat and muscle thickness.

American journal of human biology : the official journal of the Human Biology Council·2017
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

Both constant resistance (CR) and variable resistance (VR) training effectively improve full range-of-motion strength. Studies show no significant difference between CR and VR methods for developing knee extension strength across all angles.

Area of Science:

  • Exercise Physiology
  • Biomechanics
  • Strength and Conditioning

Background:

  • Understanding the optimal resistance training methods for maximizing strength development across the entire range of motion is crucial for athletes and rehabilitation.
  • Constant resistance (CR) and variable resistance (VR) training represent distinct approaches to strength training, potentially eliciting different adaptations.

Purpose of the Study:

  • To compare the effects of constant resistance (CR) and variable resistance (VR) training on full range-of-motion (ROM) strength development in knee extensions.
  • To determine if one training modality offers superior strength gains across various joint angles.

Main Methods:

  • A randomized controlled trial involving 49 participants (22 men, 27 women) assigned to CR, VR, or control groups.
  • Both CR and VR groups underwent 10 weeks of bilateral knee extension training (2-3 days/week), performing one set of 8-12 repetitions.

Related Experiment Videos

  • Maximal voluntary isometric torque was measured at multiple knee flexion angles (9-110 degrees) before and after the training intervention.

    • Main Results:

    • Both CR and VR training groups demonstrated significant strength gains at all measured angles compared to the control group (P ≤ 0.05).
    • No statistically significant differences in strength development were observed between the CR and VR groups at any angle (P > 0.05).
    • The magnitude of strength gains was similar across all tested angles for both training groups.

    Conclusions:

    • Both constant resistance and variable resistance training are effective in promoting full range-of-motion strength development.
    • Neither CR nor VR training demonstrated superiority over the other in enhancing knee extension strength across the entire range of motion in this study population.