Contraction of Cardiac Muscle With Respect to Time and Its Probable Relationship to the Ejection Curve

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Abstract
Considering the heart to be a 3-dimen-sional spheroidal solid, volume changes were calculated from changes in the length of the perimeter on the assumption that the volume would vary as the cube of any linear dimension. A system was devised to record the contraction of cardiac muscle in the dog with respect to time by an optical system. Changes in the length of cardiac muscle were interpreted as changes in a perimeter of the "sphere." Changes in volume with respect to time were assumed to represent the ejection curve of cardiac output. Such ejection curves and subsequent ejection velocity curves closely resembled those described in the literature.
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