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The law of the heart is thus the same as the law of muscular tissue generally, that the energy of contraction, however measured, is a function of the length of the muscle fibre.

Ernest Henry Starling (1965). “Starling on the Heart: Facsimile Reprints, Including the Linacre Lecture on the Law of the Heart”
The law of the heart is thus the same as the law of muscular tissue generally, that the energy of contraction, however measured, is a function of the length of the muscle fibre.