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Abstract
A combined myothermic and fluorescent investigation into the effects of substrate and calcium ions on the contractility of paired rabbit papillary muscles has shown that, (i) as shown in earlier studies pyruvate, when substituted for glucose, increases contractility, increases the levels of fluorescence and resting heat production and speeds the kinetics of fluorescent transients and the time cours of heat production, (ii) reducing the extracellular calcium level from 2.5m m to 1.25m m, decreases contractility without altering the resting fluorescence level and without changing the kinetics of fluorescent transients or the time course of active heat production. Neither treatment (substrate or calcium) altered the isometric heat coefficient. Evidence is presented showing that the fluorescence-time integral is linearly related to the energy expended in a cardiac contraction.
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