Pulsatile Pressure and Flow in the Skeletal Muscle Microcirculation

[+] Author and Article Information
Shou-Yan Lee, G. W. Schmid-Schönbein

Department of AMES-Bioengineering, University of California, San Diego, La Jolla, CA 92093

J Biomech Eng 112(4), 437-443 (Nov 01, 1990) (7 pages) doi:10.1115/1.2891208 History: Received September 20, 1989; Revised July 02, 1990; Online March 17, 2008


Although blood flow in the microcirculation of the rat skeletal muscle has negligible inertia forces with very low Reynolds number and Womersley parameter, time-dependent pressure and flow variations can be observed. Such phenomena include, for example, arterial flow overshoot following a step arterial pressure, a gradual arterial pressure reduction for a step flow, or hysteresis between pressure and flow when a pulsatile pressure is applied. Arterial and venous flows do not follow the same time course during such transients. A theoretical analysis is presented for these phenomena using a microvessel with distensible viscoelastic walls and purely viscous flow subject to time variant arterial pressures. The results indicate that the vessel distensibility plays an important role in such time-dependent microvascular flow and the effects are of central physiological importance during normal muscle perfusion. In-vivo whole organ pressure-flow data in the dilated rat gracilis muscle agree in the time course with the theoretical predictions. Hemodynamic impedances of the skeletal muscle microcirculation are investigated for small arterial and venous pressure amplitudes superimposed on an initial steady flow and pressure drop along the vessel.

Copyright © 1990 by The American Society of Mechanical Engineers
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