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Myocardial contractility represents the innate ability of the heart muscle (cardiac muscle or myocardium) to contract. It is the maximum attainable value for the force of contraction of a given heart.
During contraction of a cardiac muscle cell, the long protein myofilaments oriented along the length of the cell slide over each other in what is known as the sliding filament theory. There are two kinds of myofilaments, thick filaments composed of the protein myosin, and thin filaments composed of the proteins actin, troponin and tropomyosin ...
The contractility of both a healthy heart and a damaged heart could be increased through application of appropriate signals during the absolute refractory period of the cardiac muscle cells. [47] [48] An implantable cardiac contractility modulation device was received by a patient for the first time in 2001.
Lusitropy or lucitropy is the rate of myocardial relaxation. The increase in cytosolic calcium of cardiomyocytes via increased uptake leads to increased myocardial contractility (positive inotropic effect), but the myocardial relaxation, or lusitropy, decreases.
Contractility refers to the ability for self-contraction, especially of the muscles or similar active biological tissue Contractile ring in cytokinesis; Contractile vacuole; Muscle contraction. Myocardial contractility; See contractile cell for an overview of cell types in humans.
As a result, there is dilatation of the chamber arising from the infarct region. The initial remodeling phase after a myocardial infarction results in repair of the necrotic area and myocardial scarring that may, to some extent, be considered beneficial since there is an improvement in or maintenance of LV function and cardiac output. Over time ...
The exact recipe for a successful workout depends on the person, but along with a proper warm-up, solid training plan, and adequate cool-down, there's one secret ingredient everyone can use to ...
Cardiovascular fitness is a component of physical fitness, which refers to a person's ability to deliver oxygen to the working muscles, including the heart.Cardiovascular fitness is improved by sustained physical activity (see also Endurance Training) and is affected by many physiological parameters, including cardiac output (determined by heart rate multiplied by stroke volume), vascular ...