Muscle Fibers Slow Twitch
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Effect of tibiotarsal joint inflammation on gene expression and cross-sectional area in rat soleus muscle
BACKGROUND: Joint inflammation is a common clinical problem in patients treated by physical therapists. The hypothesis of this study is that joint inflammation induces molecular and structural changes in the soleus muscle, which is composed mainly of slow-twitch muscle fibers. OBJECTIVE: To study the effect of tibiotarsal joint inflammation on muscle f
Braz. J. Phys. Ther.. Publicado em: 07/06/2013
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2. Evaluation of the electromyographic signal and the histomorphometry of vastus lateralis muscle in different electrodes placement, intensities of contraction and genders / Avaliação do sinal eletromiografico e da histomorfometria do musculo vasto lateral em diferentes posicionamentos de eletrodos, intensidades de contração e generos
It has been shown that electromyography signal (EMGs) and histomorphometry are different along the muscle belly and between genders, although the relationship between these parameters is not clear. The aim of this study was to evaluate the EMGs in different intensities of volunteer isometric muscle contraction (10-100%) and electrodes positions over the bell
Publicado em: 2010
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3. Caracterização da distribuição da miosina rápida, lenta e híbrida na musculatura da mastigação / Characterization of fast, slow and hybrid fibers in masticatory muscles
Introdução: Os músculos da mastigação masseter, temporal, pterigóideo medial e pterigóideo lateral são componentes essenciais do sistema estomatognático. A mastigação decorre da movimentação destes músculos. Além da função fisiológica, os músculos da mastigação estão envolvidos na disfunção temporomandibular (DTM) que é importante ca
Publicado em: 2009
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4. Cyclosporin A preferentially attenuates skeletal slow-twitch muscle regeneration
Calcineurin, a Ca2+/calmodulin-dependent phosphatase, is associated with muscle regeneration via NFATc1/GATA2-dependent pathways. However, it is not clear whether calcineurin preferentially affects the regeneration of slow- or fast-twitch muscles. We investigated the effect of a calcineurin inhibitor, cyclosporin A (CsA), on the morphology and fiber diameter
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-04
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5. Estudo da interação da veratrina com o musculo esqueletico por metodos histoquimicos, ultraestruturais e bioquimicos
Veratrine, a commercial extract from the South and Central America plant Schoenocaulon officinale (Liliaceae), activates voltage-dependent Na + channels to produce persistent depolarization and an increase in sodium ion penneability in muscle fibers or nerves. The aim of this study was to investigate the effects of the veratrine aIkaloid on skeletal muscle o
Publicado em: 2000
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6. Ação do veneno total de Bothrops pirajai e de suas frações miotoxicas piratoxinas I e III sobre a musculatura esqueletica : estudos in vitro
Several reasons can be cited which motivate the study of natural substances such as the characterization of the active principles and its biological effects. Among them, the ophidic venoms stand out because it is common the occurrence of accidental envenomation after snake bites in tropical countries. In Brazil, ophidic accidents account for a major part in
Publicado em: 1999
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7. Six1 and Eya1 Expression Can Reprogram Adult Muscle from the Slow-Twitch Phenotype into the Fast-Twitch Phenotype
Muscle fibers show great differences in their contractile and metabolic properties. This diversity enables skeletal muscles to fulfill and adapt to different tasks. In this report, we show that the Six/Eya pathway is implicated in the establishment and maintenance of the fast-twitch skeletal muscle phenotype. We demonstrate that the MEF3/Six DNA binding elem
American Society for Microbiology.
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8. The low-affinity Ca2(+)-binding sites in cardiac/slow skeletal muscle troponin C perform distinct functions: site I alone cannot trigger contraction.
Both troponin C (TnC) and calmodulin share a remarkably similar tertiary motif that may be common to other Ca2(+)-binding proteins with activator activity. TnC plays a critical role in regulating muscle contraction and is particularly well-suited for structural analysis by site-directed mutation. Fast-twitch skeletal muscle TnC has two low-affinity Ca2(+)-bi
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9. Force-velocity characteristics for calcium-activated mammalian slow-twitch and fast-twitch skeletal fibers from the guinea pig.
Twitch fiber bundles from a slow (soleus) and a fast (extensor digitorum longus) mammalian muscle after mild chemical treatment were activated with calcium and relaxed in calcium-free solution. Like the electrically activated whole muscles, the force-velocity relationship was such that, at each relative load, the steady speed of shortening for the fast fiber
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10. Resting Membrane Potential and Ionic Distribution in Fast- and Slow-Twitch Mammalian Muscle
The resting membrane potential and intracellular potassium and sodium concentration of three guinea pig hind limb muscles were studied. These properties are related to the gross color, the speed of contraction, and the biochemically defined fiber type composing the muscle. The resting membrane potential and intracellular content were: white vastus (grossly w
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11. On the role of actomyosin ATPases in regulation of ATP turnover rates during intense exercise.
Actomyosin ATPase is the dominant ATP sink during muscle work. Its catalytic capacities in fast-twitch oxidative glycolytic fibers have long been known to exceed by about 3-fold those of slow-twitch oxidative fibers, but the relative contributions to control of metabolic rates during exercise have never been closely examined. We compared fast-twitch oxidativ
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12. Effects of MgATP and MgADP on the cross-bridge kinetics of rabbit soleus slow-twitch muscle fibers.
The elementary steps surrounding the nucleotide binding step in the cross-bridge cycle were investigated with sinusoidal analysis in rabbit soleus slow-twitch muscle fibers. The single-fiber preparations were activated at pCa 4.40, ionic strength 180 mM, 20 degrees C, and the effects of MgATP (S) and MgADP (D) concentrations on three exponential processes B,