Across 230 vertebrate species the product of heart rate and lifespan yields a near-constant total of approximately 10^9 cardiac cycles, confirmed by phylogenetic and multi-clade statistical tests.
(2005) Body size, energy metabolism and lifespan.J
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The Lifetime Cardiac-Cycle Invariant in Endothermic Vertebrates: A 230-Species Comparative Dataset, Statistical Validation, and Explicit Falsifiability Criteria
Across 230 vertebrate species the product of heart rate and lifespan yields a near-constant total of approximately 10^9 cardiac cycles, confirmed by phylogenetic and multi-clade statistical tests.