The 7-day biorhythm in the human body is one of the recent discoveries of modern chronobiology. It manifests itself in the form of small variations in blood pressure and heartbeat as well as response to infection and even organ transplant: for example, the probability of rejection of certain organs is now known to peak at weekly intervals following an implant.
Aveni, Anthony, Empires of Time, Rev. Ed., Boulder, Colorado: University Press of Colorado, 2002, pp. 88-89.
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