Effect of chaotic vasomotion in skeletal muscle on tissue oxygenation

Vasomotion refers to spontaneous variations in the lumen size of small vessels, with a plausible role in regulation of various aspects of microcirculation. We propose a computational model of vasomotion in skeletal muscle in which the pattern of vasomotion is shown to critically determine the effici...

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Bibliographic Details
Published in:Microvascular research 2007-07, Vol.74 (1), p.51-64
Main Authors: Pradhan, Ranjan K., Chakravarthy, V.S., Prabhakar, Anil
Format: Article
Language:English
Subjects:
Animals
Capillaries - physiology
Capillary network
Chaos
Computer Simulation
Humans
Models, Biological
Models, Theoretical
Muscle, Skeletal - blood supply
Muscle, Skeletal - metabolism
Muscle, Smooth, Vascular - physiology
Nonlinear Dynamics
Oxygen - metabolism
Regional Blood Flow - physiology
Tissue oxygenation
Vascular regulation
Vasomotion
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Summary:Vasomotion refers to spontaneous variations in the lumen size of small vessels, with a plausible role in regulation of various aspects of microcirculation. We propose a computational model of vasomotion in skeletal muscle in which the pattern of vasomotion is shown to critically determine the efficiency of oxygenation of a muscle fiber. In this model, precapillary sphincters are modeled as nonlinear oscillators. We hypothesize that these sphincters interact via exchange of vasoactive substances. As a consequence, vasomotion is described as a phenomenon associated with a network of nonlinear oscillators. As a specific instance, we model the vasomotion of precapillary sphincters surrounding an active fiber. The sphincters coordinate their rhythms so as to minimize oxygen deficit in the fiber. Our modeling studies indicate that efficient oxygenation of the fiber depends crucially on the mode of interaction among the vasomotions of individual sphincters. While chaotic forms of vasomotion enhanced oxygenation, regular patterns of vasomotion failed to meet the oxygenation demand accurately.
ISSN:0026-2862
1095-9319
DOI:10.1016/j.mvr.2007.02.004