Published online by Cambridge University Press: 24 October 2025
An effort is made to understand the scaling exponent in the allometry between body size and the watershed tempo for rhythmic pulse. Context is provided by reviewing the scaling exponents that describe the two principal ways in which the body expends energy: walking and maintenance of core body temperature through basal metabolism. The physics of the pendulum is used to derive a scaling exponent for walking. The scaling exponents for physiological timescales are derived first from a study of basal metabolism and then from a compilation of heartbeat period data. This analysis leads to the conclusion that pulse allometry has the same mathematical structure as heart period allometry. It is argued finally that both scale with the surface area of the body.
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