Mechanical behavior of the quadriceps femoris muscle tendon unit during low-load contractions.

@article{Finni2008MechanicalBO,
  title={Mechanical behavior of the quadriceps femoris muscle tendon unit during low-load contractions.},
  author={Taija Finni and Marko Havu and Shantanu Sinha and Jussi-Pekka Usenius and Sulin Cheng},
  journal={Journal of applied physiology},
  year={2008},
  volume={104 5},
  pages={
          1320-8
        }
}
We examined the relationships between morphology and muscle-tendon dynamics of the quadriceps femoris muscle of 11 men using velocity-encoded phase-contrast magnetic resonance imaging (MRI). Thigh muscle electromyography and joint range of motion were first measured outside the MRI scanner during knee extension-flexion tasks that were performed at a rate of 40 times/min with elastic bands providing peak resistance of 5.2 kp (SD 0.4) to the extension. The same movement was repeated inside the… 
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Dynamics of Quadriceps Muscles during Isometric Contractions: Velocity-Encoded Phase Contrast MRI Study
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The results imply that the quadriceps muscles act as one functional unit in normal force generation through the central aponeuroses despite complex behavior in each of the muscles, each of which possesses different physiological characteristics and architectures.
Intermuscular force transmission between human plantarflexor muscles in vivo.
TLDR
The present results suggest that force may be transmitted between the triceps surae muscles in vivo, while only limited evidence was provided for the occurrence of force transfer between the Tricia surae and the deeper-lying FHL.
Inhomogeneous Quadriceps Femoris Hypertrophy in Response to Strength and Power Training.
TLDR
Comparison of intermuscular and intramuscular QF adaptations to high-load strength training and fast-speed power training found that parallel-depth heavy squat-lift training elicited greater proximalhypertrophy in each of the vasti muscles, whereas only JS-P elicited distal VL and VI hypertrophy.
Variability in lateral positioning of surface EMG electrodes.
TLDR
It is recommended that careful consideration is given to the medial-lateral positioning of the vastus lateralis electrodes especially, so that the electrodes are positioned over the mid-muscle rather than in close proximity to rectus femoris.
Dynamic MR Imaging of the Skeletal Musculature: From Static Measures to a Dynamic Assessment of the Muscular (Loco-) Motion
TLDR
The development of sophisticated MR imaging sequences that can directly map muscle motion (velocity), or muscle tissue displacement are described and technical developments in this area of MR imaging where 2D and 3D strain tensor mappings are outlined.
An in vivo rodent model of contraction-induced injury in the quadriceps muscle.
Effects of isometric quadriceps strength training at different muscle lengths on dynamic torque production
TLDR
Isometric training-induced increases in muscle size and concentric torque were best elicited by training at long muscle lengths, highlighting a clear muscle length dependence of isometric training on dynamic torque production.
Vastus intermedius vs vastus lateralis fascicle behaviors during maximal concentric and eccentric contractions
TLDR
Comparisons of VI and vastus lateralis fascicle behaviors during singular maximal concentric and eccentric contractions indicate that VI fascicles are lengthened 1.4 times more than VL fascicles during eccentriccontractions, whereas VI and VL Fascicles shorten similarly during concentric contractions.
Longitudinal sequencing in intramuscular coordination: A new hypothesis of dynamic functions in the human rectus femoris muscle
TLDR
The results suggest that proximal fibers can be activated independently from distal fibers within the RF and could be principally in line with the operationalized “inter-fiber to tendon interaction model”.
Determination of Contraction-Induced Changes in Elbow Flexor Cross-Sectional Area for Evaluating Muscle Size-Strength Relationship During Contraction
TLDR
Results suggest that, in the elbow flexors, the contraction-induced change in the CSA reaches its peak under high contractile level and that the maximal CSA during 80%MVC is more closely related to the MVC strength than that at rest.
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