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

Practicing a maximal performance task: a cooperative strategy for muscle activity.

D A Gabriel1, J P Boucher

  • 1Department of Physical Education, Brock University. dgabriel@arnie.pe.brocku.ca

Research Quarterly for Exercise and Sport
|September 22, 2000
PubMed
Summary

Practice refines elbow flexion by adjusting muscle activity. Initially, magnitude increases speed, but later, duration changes become key for faster movements with sustained accuracy.

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

Targeting inflammation to influence cognitive function following spinal cord injury: a randomized clinical trial.

Spinal cord·2016
Same author

Effectiveness of etoposide chemomobilization in lymphoma patients undergoing auto-SCT.

Bone marrow transplantation·2012
Same author

Decreased motor unit discharge rate in the potentiated human tibialis anterior muscle.

Acta physiologica (Oxford, England)·2011
Same author

Platelet binding and activity of a factor VIIa variant with enhanced tissue factor independent activity.

Journal of thrombosis and haemostasis : JTH·2011
Same author

The surface EMG-force relationship during isometric dorsiflexion in males and females.

Electromyography and clinical neurophysiology·2009
Same author

Modeling investigation of learning a fast elbow flexion in the horizontal plane--prediction of muscle forces and motor units action.

Computer methods in biomechanics and biomedical engineering·2006

Area of Science:

  • Biomechanics
  • Motor Control
  • Neuroscience

Background:

  • Elbow flexion movement time is crucial for many tasks.
  • Understanding how practice influences motor control is vital for rehabilitation and performance enhancement.

Purpose of the Study:

  • To investigate the impact of practice on elbow flexion movement time.
  • To analyze changes in electromyographic (EMG) activity during skill acquisition.

Main Methods:

  • 18 participants performed 400 elbow flexion trials over four sessions.
  • Electromyographic (EMG) activity of biceps and triceps brachii was recorded.
  • Muscle activity onset, duration, and amplitude (MAV, Q30) were analyzed.

Main Results:

Related Experiment Videos

  • Increased limb speed correlated with decreased muscle activity duration and increased magnitude.
  • Most duration changes occurred early in practice; magnitude changes continued longer.
  • Multiple regression revealed a cooperative strategy between muscle activity magnitude and duration.

    • Conclusions:

    • Practice alters both the magnitude and duration of muscle activity to decrease movement time.
    • Early learning emphasizes magnitude adjustments, while later stages utilize duration alterations.
    • The interplay may involve cognitive factors or changes in motor unit firing frequency.