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We modelled the nonpulsatile circulation with baroreflex and cardiopulmonary reflexes. Special care was taken to model as accurate as possible the various delays and time constants to obtain reliable dynamic responses in the model. In experimenting with the model circulation we found that blood pressure was stable under a wide range of adverse conditions and could only be made to vary as observed in human beings by modulating the sensitivity of the baroreflex. Pseudo-static modulation caused blood pressure in the model to vary over a three-to-one range, more than is necessary to mimic circadian blood pressure variability. Dynamic baroreflex modulation with 1/ f random noise allowed the computation of blood pressure variability spectra in all practical aspects identical to those observable in human beings.
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