Separate determination of the pulsatile elastic and viscous forces developed in the arterial wall in vivo.

The viscoelastic behaviour of arteries in vivo is analyzed by separate representation of the purely elastic and the purely viscous properties, using natural pressure and diameter pulses of various dog arteries recorded under steady-state conditions. The circumferential wall stress (σ) and the radius (r) of the mean wall layer are calculated as functions of time and the hysteresis of the σ-r diagram is represented. The stress is regarded as the sum of an elastic stress (σel) which is a function ofr, and a viscous stress (σvis) which is a function ofdr/dt. Thus σel=σ−σvis. Since the σel-r diagram must be free from hysteresis, the disappearance of the loop is the criterion that indicates that σel has been found.