نتایج جستجو برای: muscle contraction
تعداد نتایج: 354209 فیلتر نتایج به سال:
BACKGROUND Resistive exercise after stroke can improve strength (force-generating capacity) without increasing spasticity (velocity-dependent hypertonicity). However, the effect of resistive load type on muscle activation and co-contraction after stroke is not clear. OBJECTIVE The purpose of this study was to determine the effect of load type (elastic, viscous, or mass) on muscle activation a...
At onset of muscle contraction, myoglobin (Mb) immediately releases its bound O2 to the mitochondria. Accordingly, intracellular O2 tension (PmbO2) markedly declines in order to increase muscle O2 uptake (mVO2). However, whether the change in PmbO2 during muscle contraction modulates mVO2 and whether the O2 release rate from Mb increases in endurance-trained muscles remain unclear. The purpose ...
Both insulin and contraction stimulate glucose transport in skeletal muscle. Insulin-stimulated glucose transport is decreased in obese humans and rats. The aims of this study were (1) to determine if contraction-stimulated glucose transport was also compromised in skeletal muscle of genetically obese insulin-resistant Zucker rats, and (2) to determine whether the additive effects of insulin an...
Non-uniform contraction exists in many skeletal muscles and plays an important role the function of musculoskeletal system. Particularly gluteus medius (GM) muscle, its three subdivisions appear activated differently while performing various motion tasks. However, non-uniform contractile mechanism GM is poorly understood. In this study, a three-dimensional finite element (FE) model was develope...
Mechanisms linked to actin filaments have long been thought to cooperate in smooth muscle contraction, although key molecules were unclear. We show evidence that cardiac troponin T (cTnT) substantially contributes to Ca(2+)-mediated contraction in a physiological range of cytosolic Ca(2+) concentration ([Ca(2+)](i)). cTnT was detected in various smooth muscles of the aorta, trachea, gut and uri...
This study examined the effects of cycling training on mechanomyographic median power frequency (MMGMDF)–torque relationships vastus lateralis (VL). Ten males (Age ± SD; 20.20 1.87 years) and 14 females (21.93 5.33 performed isometric trapezoidal muscle actions with knee extensors at 40% maximal voluntary contraction (MVC) before (PRE) following 10 weeks same absolute submaximal torque as pre-t...
AIMS To assess the effects of dietary creatine supplementation on skeletal muscle metabolism and endurance in patients with chronic heart failure. METHODS A forearm model of muscle metabolism was used, with a cannula inserted retrogradely into an antecubital vein of the dominant forearm. Maximum voluntary contraction was measured using handgrip dynanometry. Subjects performed handgrip exercis...
This study examined the source of Ca(2+) mobilized by phorbol esters and its requirement for phorbol-induced contraction of smooth muscle cells isolated from the circular and longitudinal layers of guinea pig intestine. Phorbol-12-myristate-13-acetate caused rapid, sustained, concentration-dependent muscle contraction and increase in cystolic free [Ca(2+)](i) in muscle cells from both layers. M...
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