Pflügers Archiv

, Volume 380, Issue 3, pp 221–226

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

  • R. D. Bauer
  • R. Busse
  • A. Schabert
  • Y. Summa
  • E. Wetterer
Heart, Circulation, Respiration and Blood; Environmental and Exercise Physiology

DOI: 10.1007/BF00582900

Cite this article as:
Bauer, R.D., Busse, R., Schabert, A. et al. Pflugers Arch. (1979) 380: 221. doi:10.1007/BF00582900

Abstract

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.

σvis is formulated as a second degree polynomial ofdr/dt whose coefficients are determined using that criterion.

The σel-r curve is always nonlinear and the elastic modulus increases with increasing radius. The σvis-dr/dt curve, too, is nonlinear. Its slope decreases with increasingdr/dt. The same applies to the wall viscosity (pseudoplastic behaviour). The nonlinear properties can be represented adequately by processing the experimental data in the time domain. Problems inherent in investigations based on the frequency domain, as reported in the literature, are pointed out.

Key words

Arterial elasticityArterial wall viscosityArterial stress-strain relationshipModels of the arterial wall

Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • R. D. Bauer
    • 1
  • R. Busse
    • 1
  • A. Schabert
    • 1
  • Y. Summa
    • 1
  • E. Wetterer
    • 1
  1. 1.Institut für Physiologie und Kardiologie der Universität Erlangen-NürnbergErlangenGermany