Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Net Torque Calculations

Net Torque Calculations

When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Peripheral Neuromuscular Fatigue Responses of the Knee Extensors to Distinct Concurrent Training Protocols: A Preliminary Study.

Journal of functional morphology and kinesiology·2026

Same author

Impact of Correcting for Pelvic Tilt on the Assessment of Concentric Hip Extension Torque: Validity and Reliability of Isokinetic Dynamometry.

Scandinavian journal of medicine & science in sports·2026

Same author

Pathways to Mental Health Care: The Role of Religion and Spirituality in Help Seeking for Psychosis.

Psychiatric services (Washington, D.C.)·2026

Same author

Time to Cross Paths: Neuroplasticity-Informed ACL Rehabilitation that Includes Cross-Education.

Sports medicine - open·2026

Same author

The athletic hip. Joint status and muscle strength among the key elements in the return to sport process.

Frontiers in sports and active living·2025

Same author

Kinematic and Kinetic Comparison of Sprint-Specific Exercises: Impact on Maximal Sprint Acceleration Training.

Journal of human kinetics·2025

Search research articles

Related Experiment Video

Updated: Apr 26, 2026

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People

Published on: July 5, 2017

Validity of trunk extensor and flexor torque measurements using isokinetic dynamometry.

Gaël Guilhem¹, Caroline Giroux², Antoine Couturier¹

¹French National Institute of Sport (INSEP), Research Department, Laboratory Sport, Expertise and Performance, Paris, France.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology

|August 5, 2014

Summary

This study validates a new isokinetic dynamometer for trunk muscle strength testing. It shows excellent reliability and accuracy for measuring eccentric, isometric, and concentric peak torque in flexor and extensor muscles.

Keywords:

Cross sectional area EMG Erector spinae GRRAS Muscle strength Rectus abdominis

More Related Videos

Method to Measure Tone of Axial and Proximal Muscle

Method to Measure Tone of Axial and Proximal Muscle

Published on: December 14, 2011

In Vivo Measurement of Hindlimb Dorsiflexor Isometric Torque from Pig

In Vivo Measurement of Hindlimb Dorsiflexor Isometric Torque from Pig

Published on: September 3, 2021

Related Experiment Videos

Last Updated: Apr 26, 2026

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People

Published on: July 5, 2017

Method to Measure Tone of Axial and Proximal Muscle

Method to Measure Tone of Axial and Proximal Muscle

Published on: December 14, 2011

In Vivo Measurement of Hindlimb Dorsiflexor Isometric Torque from Pig

In Vivo Measurement of Hindlimb Dorsiflexor Isometric Torque from Pig

Published on: September 3, 2021

Area of Science:

Biomechanics
Musculoskeletal Physiology
Rehabilitation Technology

Background:

Accurate assessment of trunk muscle strength is crucial for clinical evaluation and athletic performance.
Isokinetic dynamometry offers a standardized method for quantifying muscle strength.
Evaluating the validity and reliability of new equipment is essential before widespread clinical adoption.

Purpose of the Study:

To assess the validity and test-retest reliability of trunk muscle strength testing using a latest-generation isokinetic dynamometer.
To correlate muscle cross-sectional area (CSA) and electromyographic (EMG) activity with measured torque.
To establish the suitability of the device for clinical and athletic assessments.

Main Methods:

15 healthy subjects performed eccentric, isometric, and concentric peak torque tests for trunk flexors and extensors.
Muscle CSA and surface EMG activity were measured and correlated with torque.
Test-retest reliability was assessed using intraclass correlation coefficients (ICCs) and measurement error.

Main Results:

Significant correlations were found between muscle CSA and peak torque (r=0.74-0.85, P<0.001) across all contraction types.
High correlations were observed between EMG activity and submaximal isometric torque (r ⩾ 0.99, P<0.05).
Excellent test-retest reliability was demonstrated with ICCs between 0.87-0.95 and measurement errors <9%.

Conclusions:

The latest-generation isokinetic dynamometer demonstrates validity for trunk muscle strength testing.
The device exhibits excellent test-retest reliability for peak torque measurements.
This isokinetic dynamometer can be confidently used to evaluate trunk muscle function in clinical and athletic settings.