Energy Production in Cardiac Isotonic Contractions
نویسندگان
چکیده
منابع مشابه
Energy Production in Cardiac Isotonic Contractions
The energy output of rabbit papillary muscle is examined and it is shown that there is more energy liberated in an afterloaded isotonic contraction than in an "equivalent" isometric contraction. This statement holds true regardless of whether equivalence is based on the proposition that tension or the time integral of tension is the best index of muscle energy expenditure. Besides the external ...
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Using frog's sartorius muscles we have found no correlation between phosphocreatine hydrolysis and shortening under conditions (iodoacetate poisoning and anoxia) where this reaction was the only expected source of energy. Phosphocreatine hydrolysis did, however, show a constant term corresponding to the activation heat of A.V. Hill, and a linear term with work. It was concluded that shortening ...
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Since regulation of cardiac muscle contraction is complex, many simulation studies have been conducted to systematically analyze regulatory mechanisms underlying the force-velocity relationship. However, past studies were performed with models lacking detailed thin filament activation despite its essential regulatory role. Here a novel cardiac muscle contraction model is presented that consider...
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متن کاملComparison of the efficiency of rat papillary muscles during afterloaded isotonic contractions and contractions with sinusoidal length changes.
The results of previous studies suggest that the maximum mechanical efficiency of rat papillary muscles is lower during a contraction protocol involving sinusoidal length changes than during one involving afterloaded isotonic contractions. The aim of this study was to compare directly the efficiency of isolated rat papillary muscle preparations in isotonic and sinusoidal contraction protocols. ...
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1970
ISSN: 1540-7748,0022-1295
DOI: 10.1085/jgp.56.6.732