Quadriceps muscles vastus medialis obliques, rectus femoris and vastus lateralis compared via electromyogram bicoherence analysis

2003 ◽  
Vol 26 (3) ◽  
pp. 125-131
Author(s):  
R. J. Simeoni ◽  
P. M. Mills
Keyword(s):  
Vastus Lateralis ◽  
Rectus Femoris ◽  
Vastus Medialis

Decrease in maximal voluntary contraction by tonic vibration applied to a single synergist muscle in humans

2000 ◽  
Vol 89 (4) ◽  
pp. 1420-1424 ◽  
Author(s):  
Motoki Kouzaki ◽  
Minoru Shinohara ◽  
Tetsuo Fukunaga
Keyword(s):  
Maximal Voluntary Contraction ◽  
Vastus Lateralis ◽  
Rectus Femoris ◽  
Knee Extension ◽  
Voluntary Contraction ◽  
Vastus Medialis ◽  
Force Development ◽  
Ia Afferent ◽  
Before And After ◽  
Integrated Emg

The purpose of the study was to examine the effect of prolonged tonic vibration applied to a single synergist muscle on maximal voluntary contraction (MVC) and maximal rate of force development (dF/d t max). The knee extension MVC force and surface electromyogram (EMG) from the rectus femoris (RF), vastus lateralis (VL), and vastus medialis (VM) during MVC were recorded before and after vibration of RF muscle at 30 Hz for 30 min. MVC, dF/d t max, and the integrated EMG (iEMG) of RF decreased significantly after prolonged tonic vibration in spite of no changes in iEMG of VL and VM. The present results indicate that MVC and dF/d t max may be influenced by the attenuated Ia afferent functions of a single synergist muscle.

scholarly journals The Relationship Between Additional Heads of the Quadriceps Femoris, the Vasti Muscles and the Patellar Ligament

2021 ◽  
Author(s):  
Łukasz Olewnik ◽  
Kacper Ruzik ◽  
Bartłomiej Szewczyk ◽  
Michał Podgórski ◽  
Paloma Aragonés ◽  
...  
Keyword(s):  
Vastus Lateralis ◽  
Rectus Femoris ◽  
Quadriceps Femoris ◽  
The Other ◽  
Lower Limbs ◽  
Patellar Ligament ◽  
Vastus Medialis ◽  
Vastus Intermedius ◽  
Deep Layers ◽  
The Relationship

Abstract Introduction: The quadriceps femoris consists of four muscles: the rectus femoris, vastus medialis, vastus intermedius and vastus lateralis. However, the effect of additional quadriceps femoris heads on the vasti muscles and patellar ligaments is unknown.Materials and Methods: One hundred and six lower limbs (34 male and 19 female cadavers) fixed in 10% formalin were examined.Results: On all lower extremities, the vastus lateralis consisted of superficial, intermediate and deep layers. The vastus medialis, on the other hand, consisted of only the longus and obliquus layers. Additional quadriceps femoris heads affected both the vasti muscles and the patellar ligaments.Conclusion: There is a strong correlation between the presence of accessory quadriceps femoris heads and effects on vasti muscles and patellar ligament.

Design of Wearable Lower Limb Rehabilitation Device

2013 ◽  
Vol 721 ◽  
pp. 661-665
Author(s):  
Jia Jia Mo ◽  
Yi Jui Chiu ◽  
Dar Zen Chen
Keyword(s):  
Lower Limb ◽  
Vastus Lateralis ◽  
Rectus Femoris ◽  
Vastus Medialis ◽  
Stroke Patients ◽  
Home Based ◽  
Lower Limb Movement ◽  
Therapeutic Robots ◽  
Limb Rehabilitation ◽  
Lower Limb Rehabilitation

We propose a lower limb rehabilitation device to assist people with impairment in regaining the ability of legs. The device consists of links and the installation of springs, the features are as follows: (1) it is semi-passive and home-based, allowing stroke patients to conduct lower limb movement under their own control; (2) the structure is simple and the weight is light, but it has the similar benefit as other therapeutic robots; (3) Biodex and Electromyography (EMG) are utilized to analyze the device. The result shows rectus femoris, vastus lateralis and vastus medialis muscles are well trained.

scholarly journals Qualitative and Quantitative Anatomy of the Human Quadriceps Tendon in Young Cadaveric Specimens

2021 ◽  
Vol 9 (9) ◽  
pp. 232596712110373
Author(s):  
Marc Strauss ◽  
Mitchell L. Kennedy ◽  
Alex Brady ◽  
Gilbert Moatshe ◽  
Jorge Chahla ◽  
...  
Keyword(s):  
Vastus Lateralis ◽  
Cruciate Ligament ◽  
Rectus Femoris ◽  
Middle Layer ◽  
Quadriceps Tendon ◽  
Proximal Part ◽  
Superficial Layer ◽  
Measuring System ◽  
Vastus Medialis ◽  
Median Length

Background: A detailed understanding of the anatomy of the quadriceps tendon (QT) is clinically relevant, owing to its increased use as a graft in anterior cruciate ligament reconstruction. Purpose: To qualitatively and quantitatively describe the anatomy of the QT in younger adult specimens. Study Design: Descriptive laboratory study. Methods: A total of 18 nonpaired cadaveric knees with a mean age of 30.1 years (range, 18-38 years) were utilized for this study. A 3-dimensional coordinate measuring system was used to assess the structural relationships between the different layers of the QT and their attachments to the patella, and QT thickness was measured medially, centrally, and laterally at 2-cm intervals from the patellar eminence line (PEL; defined as a straight line between the medial and lateral patellar eminences) and proximally. Results: In all specimens, 3 distinct layers formed the QT. The first (superficial) layer was formed by the rectus femoris, which was fused to the second layer with an unclearly defined direct attachment to the patella. The median length of the QT was 86.9 mm (range, 68.4-98.9 mm). The second (middle) layer consisted of the vastus medialis and vastus lateralis and was found to have fibers running in an oblique direction that attached on the patella. A “fuse point,” where the proximal part of the rectus femoris started to merge to the second layer, was identified at a median of 48.7 mm (range, 27.9-62.6 mm) from the PEL. The third (deep) layer consisted of the vastus intermedius. The median thickness of the graft centrally at 20, 40, 60, 80, and 100 mm from the PEL was 8.5, 7.2, 7.5, 6.5, and 5.4 mm, respectively. Conclusion: Overall, 3 different layers of the QT were consistently found in all specimens. The first layer was fused with the second layer, and the direction of the fibers of the second layer or the vastus medialis and vastus lateralis was oblique. The median length of the QT was 86.9 mm, and the thickness of the tendon diminished proximally. Clinical Relevance: This study allows for a better understanding of QT anatomy when harvesting the tendon as a graft for ligamentous reconstruction.

scholarly journals Telemetered Electromyography of the Fast and Slow Extensors of the Leg of the Brown Lemur (Lemur Fulvus)

1987 ◽  
Vol 130 (1) ◽  
pp. 341-358 ◽  
Author(s):  
F. C. ANAPOL ◽  
W. L. JUNGERS
Keyword(s):  
Elastic Strain ◽  
Strain Energy ◽  
Vastus Lateralis ◽  
Elastic Strain Energy ◽  
Rectus Femoris ◽  
Division Of Labour ◽  
High Potential ◽  
Vastus Medialis ◽  
Vastus Intermedius ◽  
Locomotory Behaviour

Quantitative telemetered electromyography from the four heads of the quadriceps femoris (vastus medialis, rectus femoris, vastus intermedius and vastus lateralis) during normal postures and locomotion (quadrupedal resting, walk/run, gallop and leaping) is presented for the brown lemur, Lemur fulvus. The vastus intermedius is the sole contributor to muscle recruitment during quadrupedal resting postures. It exhibits consistently high levels of electrical activity during all locomotory behaviour. The vastus medialis is recruited least among these muscles during walk/run and tends to be ‘saved’ for galloping and leaping. The rectus femoris and vastus lateralis are recruited at similarly high levels during all phasic activities. The rectus femoris appears to be used eccentrically, storing ‘elastic strain energy’ during all phasic activities. The vastus lateralis combines exceptionally high potential effective force with relatively high potential velocity and resistance to fatigue and probably develops the majority of force in all phasic activities. These results support previously documented structural and histochemical data that imply a functional division of labour among these muscle synergists.

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