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Contraction
(redirected from myocardial contraction)

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Contraction
In a business cycle, the time between the peak and the bottom. That is, a contraction occurs between the end of economic growth and the end of the subsequent recession. Contractions are characterized by layoffs, a decline in GDP, and other negative factors. However, historically, contractions have tended not to last as long as expansions.
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As a component of the electron transport chain, CoQ10 plays a key role in energy production, and is therefore essential for all energy-dependent process, including myocardial contraction.
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Similar to the structurally related drug amphetamine, ephedrine acts by directly stimulating the sympathomimetic system and the central nervous system (CNS, alpha and beta agonists), possibly increasing heart rate, myocardial contraction, peripheral vasoconstriction with associated elevations in blood pressure, bronchodilation, and mydriasis.
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This could be especially important during exercise at higher heart rates, when the myocardial contraction inhibits coronary artery flow.
Vasoconstriction Seen in Coronary Bypass Grafts During Handgrip in ... by Swisher, Anne K. / Cardiopulmonary Physical Therapy Journal
 
 
 
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