Effects of isometric training on the knee extensor moment–angle relationship and vastus lateralis muscle architecture

2014 ◽  
Vol 114 (11) ◽  
pp. 2437-2446 ◽  
Author(s):  
Luis M. Alegre ◽  
Asunción Ferri-Morales ◽  
Raúl Rodriguez-Casares ◽  
Xavier Aguado
2015 ◽  
Vol 21 (4) ◽  
pp. 428-435
Author(s):  
Guilherme Auler Brodt ◽  
Jeam Marcel Geremia ◽  
Mônica de Oliveira Melo ◽  
Marco Aurélio Vaz ◽  
Jefferson Fagundes Loss

Abstract The aim of this study was to compare the knee extension moment of older individuals with the muscle moment estimated through a biomechanical model. This was accomplished by using (1) the specific muscle architecture data of individuals, and (2) the generic muscle architecture available in the literature. The muscle force estimate was determined using a model with the muscle architecture from cadavers and the individual vastus lateralis muscle architecture of sixteen older volunteers. For the muscle moment comparison, all of the volunteers performed maximal voluntary isometric contractions (MVIC) in five different knee extension position angles. The architectural data was acquired using both resonance and ultrasound imaging. Both estimated muscle moments (generic and individual) were higher than the experimental. The architecture of the other vastii may be necessary to make the model more accurate for the older population. Although other factors inherent to ageing, such as co-contractions, fiber type percentage, and passive forces are not considered in the model, they could be responsible for the differences between moments in older people.


Author(s):  
Eurico Peixoto César ◽  
Letícia De Oliveira Teixeira ◽  
Daniel Vieira Braña Côrtes de Souza ◽  
Paulo Sergio Chagas Gomes

The aim of the study was to investigate the acute effects of passive static stretching (PSS) on the fascicle length (FL) and fascicle angle (FA) of the vastus lateralis muscle (VL) in two different joint positions. Twelve physically active men (26.9 ± 7.5 years, 178.6 ± 7.0 cm, and 82.5 ± 16.8 kg) were placed in the prone position for the acquisition of ultrasound images (US) of VL, registered with extended and totally flexed knee up to the heel contact with the gluteus, before and after a PSS routine comprised of three 30-s repetitions maintained in the maximal discomfort position as reported by the participant. Results of the paired t-test indicated an increase in FL (16.2%; p = 0.012) and reduction in FA (15.5%; p = 0.003) in pre vs. post stretching comparisons for the extended knee position. There was also a significant increase in FL (34%; p = 0.0001) and reduction in FA (25%; p = 0.0007) when compared the extended knee vs. flexed knee positions. There were no significant differences in muscle architecture variables for the flexed knee position. The results showed high and moderate correlation of FL and FA for the extended (r = -0.89 and r = -0.74) and flexed knee (r = -0.76 and r = -0.78) position, pre and post stretching, respectively. It was concluded that the static stretching acutely affects the vastus lateralis muscle architecture only in the extended knee position, but not in the flexed knee position.


2017 ◽  
Vol 118 (2) ◽  
pp. 291-301 ◽  
Author(s):  
Robert Marzilger ◽  
Kirsten Legerlotz ◽  
Chrystalla Panteli ◽  
Sebastian Bohm ◽  
Adamantios Arampatzis

2017 ◽  
Vol 31 (1) ◽  
pp. 254-259 ◽  
Author(s):  
Gianluca Vernillo ◽  
Cesare Pisoni ◽  
Luca M. Sconfienza ◽  
Gabriele Thiébat ◽  
Stefano Longo

2014 ◽  
Vol 46 ◽  
pp. 355 ◽  
Author(s):  
Adam J. Wells ◽  
David H. Fukuda ◽  
Jay R. Hoffman ◽  
Adam M. Gonzalez ◽  
Adam R. Jajtner ◽  
...  

2000 ◽  
Vol 278 (2) ◽  
pp. R400-R406 ◽  
Author(s):  
C. Juel ◽  
H. Pilegaard ◽  
J. J. Nielsen ◽  
J. Bangsbo

Interstitial K+ concentrations were measured during one-legged knee-extensor exercise by use of microdialysis with probes inserted in the vastus lateralis muscle of the subjects. K+ in the dialysate was measured either by flame photometry or a K+-sensitive electrode placed in the perfusion outlet. The correction for fractional K+ recovery was based on the assumption of identical fractional thallium loss. The interstitial K+ was 4.19 ± 0.09 mM at rest and increased to 6.17 ± 0.19, 7.48 ± 1.18, and 9.04 ± 0.74 mM at 10, 30, and 50 W exercise, respectively. The individual probes demonstrated large variations in interstitial K+, and values >10 mM were obtained. The observed interstitial K+ was markedly higher than previously found for venous K+ concentrations at similar work intensities. The present data support a potential role for interstitial K+ in regulation of blood flow and development of fatigue.


Author(s):  
Vishnu Mohan ◽  
Gopikrishna BJ ◽  
Avnish Pathak ◽  
Mahesh Kumar ES ◽  
Duradundi G

Myositis ossificansis characterized by heterotopic ossification (calcification) of muscle of various etiologies. It is most commonly affected in the quadriceps of the thighs. There are many tools available for diagnosis of Myositis ossificans, but lack of satisfactory treatment. So the development of a treatment protocol for Myositis ossificans is the need of today`s era. In Ayurveda, the same can be understood as Urusthamba. The present paper discusses a case of Myositis ossificans of right vastus lateralis muscle and its Ayurvedic treatment.


Sign in / Sign up

Export Citation Format

Share Document