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 Concept Videos

Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective response...
Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...

You might also read

Related Articles

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

Sort by
Same author

Postural stability during low-intensity respiratory loading in pre-COPD and healthy adults: a cross-sectional study.

Archives of physiotherapy·2026
Same author

Changes in calf skin temperature during ramp-incremental cycling exercise and their association with gas exchange and respiratory compensation thresholds.

Physiological measurement·2026
Same author

Acute Modulation of Lumbar Motor Unit Behavior During Experimentally Induced Low Back Pain: A Motor Unit Decomposition Analysis.

Physiotherapy research international : the journal for researchers and clinicians in physical therapy·2026
Same author

Exploration of the associations between muscle oxygen saturation and skin temperature responses during isokinetic strength exercise.

PloS one·2026
Same author

Male and Female Master Rowers Physiologically Resilient to Repeated Maximal Efforts?

Journal of strength and conditioning research·2026
Same author

Can jerk cost and resultant mechanical impulse be helpful tools to discriminate swimming performance in young swimmers?

Sports biomechanics·2026

Related Experiment Video

Updated: May 7, 2026

Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test
06:00

Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test

Published on: July 27, 2015

Relationship Between Decomposition of Surface Electromyography Signals and Force Production: Analyzing Recovery From

Manoela Vieira Sousa1,2, Jose Ignacio Priego-Quesada3, Klaus M Becker1,2

  • 1Center of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Porto, Portugal.

Journal of Applied Biomechanics
|February 19, 2026
PubMed
Summary

Muscle force recovery after intense knee exercise is incomplete at 48 hours. Motor unit action potential amplitude in the vastus lateralis is crucial for muscle recovery post-exercise.

Keywords:
exercise recoveryinfrared thermographysurface EMG decomposition

More Related Videos

Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation
07:53

Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation

Published on: September 13, 2015

Acquisition and Semi-Automated Analysis of Respiratory Muscle Surface Electromyography
09:42

Acquisition and Semi-Automated Analysis of Respiratory Muscle Surface Electromyography

Published on: January 24, 2025

Related Experiment Videos

Last Updated: May 7, 2026

Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test
06:00

Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test

Published on: July 27, 2015

Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation
07:53

Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation

Published on: September 13, 2015

Acquisition and Semi-Automated Analysis of Respiratory Muscle Surface Electromyography
09:42

Acquisition and Semi-Automated Analysis of Respiratory Muscle Surface Electromyography

Published on: January 24, 2025

Area of Science:

  • Exercise Physiology
  • Neuromuscular Physiology
  • Sports Science

Background:

  • Understanding muscle recovery mechanisms post-intense exercise is vital for optimizing training and rehabilitation.
  • Previous research has explored various physiological and biomechanical markers, but the interplay between neuromuscular, biomechanical, and perceptual responses requires further investigation.

Purpose of the Study:

  • To investigate the relationship between neuromuscular, biomechanical, physiological, and perceptual markers during recovery from intense knee exercise.
  • To identify key indicators of muscle recovery and potential predictors of delayed recovery.

Main Methods:

  • Eleven participants underwent an intense knee exercise protocol involving maximal isometric and concentric-eccentric contractions.
  • Neuromuscular (motor unit action potential amplitude [MUAP], firing rate, recruitment threshold), biomechanical (force loss), physiological (skin temperature), and perceptual (delayed onset of muscle soreness) markers were assessed at 0, 24, and 48 hours post-exercise.
  • Electromyography signal decomposition and skin temperature measurements were conducted during exercise.

Main Results:

  • Force production (isometric, dynamic, work) was significantly reduced at all post-exercise time points.
  • Delayed onset of muscle soreness increased at 24 and 48 hours post-exercise.
  • Positive correlations were found between dynamic force loss and vastus lateralis MUAP at 0 hours, and between dynamic peak torque and vastus lateralis MUAP at 24 hours.
  • Correlations were also observed between firing rate/recruitment threshold and skin temperature.

Conclusions:

  • Full recovery of muscle force is not achieved by 48 hours post-intense knee exercise.
  • Motor unit action potential amplitude of the vastus lateralis appears to play a significant role in the muscle recovery process.
  • The findings highlight the prolonged nature of neuromuscular and biomechanical deficits following strenuous exercise.