نتایج جستجو برای: muscle contractions

تعداد نتایج: 342962  

2014
Craig A. Goodman Jason A. Bennie Murray J. Leikis Michael J. McKenna

The Na+,K+-ATPase (NKA) plays a fundamental role in the regulation of skeletal muscle membrane Na+ and K+ gradients, excitability and fatigue during repeated intense contractions. Many studies have investigated the effects of acute concentric exercise on K+ regulation and skeletal muscle NKA, but almost nothing is known about the effects of repeated eccentric contractions. We therefore investig...

Journal: :Muscle & nerve 2013
Benjamin T Corona Christopher P Ingalls

INTRODUCTION Nitric oxide (NO) signaling regulates many biological processes in skeletal muscle, wherein aberrant signaling contributes to myopathic conditions (e.g., Duchenne muscular dystrophy). NO has been shown to play a role in muscle regeneration after injury. However, less is known about its role during injury. In this study we aimed to determine whether NO synthase (NOS) inhibition exac...

Journal: :The Korean journal of physiology & pharmacology : official journal of the Korean Physiological Society and the Korean Society of Pharmacology 2009
Koon Hee Han Gap Jin Cheon Dong Soo Yeon Seong Chun Kwon

This study was designed to clarify the mechanism of the inhibitory effect of forskolin on contraction, cytosolic Ca(2+) level ([Ca(2+)](i)), and Ca(2+) sensitivity in guinea pig ileum. Forskolin (0.1 nM~10 microM) inhibited high K(+) (25 mM and 40 mM)- or histamine (3 microM)-evoked contractions in a concentration-dependent manner. Histamine-evoked contractions were more sensitive to forskolin ...

Journal: :Movement disorders : official journal of the Movement Disorder Society 2006
Gea Drost Aad Verrips Baziel G M van Engelen Dick F Stegeman Machiel J Zwarts

We report a child with Satoyoshi syndrome manifested by involuntary painful muscle contractions and alopecia. Although an autoimmune origin of Satoyoshi syndrome seems likely, its exact etiology remains as yet unknown, as is the origin of the involuntary contractions. To gain a better understanding of the electrophysiological characteristics of the involuntary contractions, we performed a surfa...

Journal: :Journal of applied physiology 2008
Nicole C Lockhart Susan V Brooks

Skeletal muscles can be injured by their own contractions, especially when the muscle is stretched during a lengthening contraction. Exposing a muscle to a conditioning protocol of stretches without activation (passive stretches) before lengthening contractions reduces contraction-induced injury. Although passive stretching does not damage muscle fibers, neutrophils are elevated in the muscle a...

2013
Han Wang Derek Sieburth

Cyclic adenosine monophosphate (cAMP) has been implicated in the execution of diverse rhythmic behaviors, but how cAMP functions in neurons to generate behavioral outputs remains unclear. During the defecation motor program in C. elegans, a peptide released from the pacemaker (the intestine) rhythmically excites the GABAergic neurons that control enteric muscle contractions by activating a G pr...

2005
CHRIS LINGLE

1. Effects of dopamine (DA) on contractile and electrical properties of decapod foregut neuromuscular preparations were examined. 2. Dopamine produced dramatic increases in nerve-evoked contractions and, in particular muscles, contractures and spontaneous contractions. These effects were observed at concentrations as low as 5 x io~~ M-DA. 3. The DA-produced enhancement of nerve-evoked contracti...

Journal: :Physical therapy 1990
A Delitto L Snyder-Mackler

Electrical stimulation of muscle is a commonly used, well-substantiated strategy that physical therapists use to augment strength in patients with muscle weakness. Two distinctly different theories of strength augmentation using percutaneous muscle stimulation are presented. The first theory proposes that augmentation of muscle strength with electrically elicited muscle contractions occurs in a...

Journal: :Journal of applied physiology 2003
Troy E Richardson Casey A Kindig Timothy I Musch David C Poole

Chronic heart failure (CHF) reduces muscle blood flow at rest and during exercise and impairs muscle function. Using intravital microscopy techniques, we tested the hypothesis that the speed and amplitude of the capillary red blood cell (RBC) velocity (VRBC) and flux (FRBC) response to contractions would be reduced in CHF compared with control (C) spinotrapezius muscle. The proportion of capill...

Objectives: The results of a few studies about the effects of ankle brace on muscles function during the performance of different tasks are contradictory. Moreover, the effect of brace on the co-contraction of ankle muscles is undiscovered. Therefore, the present study investigated the effect of brace usage on the ankle muscles activity and co-contraction during single-leg landing. Methods: Fi...

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