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

Paraspinal muscle reflex dynamics.

K P Granata1, G P Slota, B C Bennett

  • 1Motion Analysis and Motor Performance Laboratory, University of Virginia, 2270 Ivy Road, Charlottesville, VA 22903, USA. granata@vt.edu

Journal of Biomechanics
|January 7, 2004
PubMed
Summary

Paraspinal muscle reflexes provide feedback for spinal stability, responding to trunk disturbances. This study quantified reflex gain, finding it increases with perturbation but decreases with trunk flexion preload.

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

Fatigue influences the dynamic stability of the torso.

Ergonomics·2008
Same author

Torso flexion modulates stiffness and reflex response.

Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology·2007
Same author

Determinants of gait as applied to children with cerebral palsy.

Gait & posture·2006
Same author

Interface stability influences torso muscle recruitment and spinal load during pushing tasks.

Ergonomics·2006
Same author

Virtual slope control of a forward dynamic bipedal walker.

Journal of biomechanical engineering·2005
Same author

Active stiffness of the ankle in response to inertial and elastic loads.

Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology·2004

Area of Science:

  • Biomechanics
  • Neuroscience
  • Human Motor Control

Background:

  • Spinal stability relies on neuromuscular control, with paraspinal reflexes acting as a feedback mechanism against trunk disturbances.
  • Previous research explored preparatory muscle recruitment, but paraspinal reflex gain as a feedback response remains under-characterized.

Purpose of the Study:

  • To quantify the input-output dynamics of paraspinal reflexes using impulse response function (IRF).
  • To investigate the influence of perturbation force and trunk flexion preload on paraspinal reflex gain.

Main Methods:

  • Surface electromyography (EMG) recorded from trunk muscles during anteriorly directed impact force perturbations.
  • Trunk perturbation forces ranged from 6.1 to 12.0 Ns with 0 and 110 N flexion preload.

Related Experiment Videos

  • Impulse response function (IRF) and its gain (G(IRF)) were calculated from EMG output and force input.

    • Main Results:

    • Reflex EMG was quantifiable in 91% of perturbations, with a mean onset latency of 30.7 ms.
    • Reflex amplitude and G(IRF) increased with perturbation force impulse.
    • G(IRF) showed a declining trend with increasing flexion preload.

    Conclusions:

    • Paraspinal reflex gain is a quantifiable measure of neuromechanical feedback for spinal stability.
    • Flexion preload appears to modulate the reflex response, suggesting a complex interaction in maintaining stability.
    • Further research is needed to elucidate the precise contribution of these reflex dynamics to overall spinal stability.