Oxygen dynamics in microcirculation of skeletal muscle

M. Shibata, S. Hamashima, S. Ichioka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Capillaries were believed to be the sole source of O2 supply to tissue. However, the recent studies have demonstrated a longitudinal PO2 drop in arterioles, suggesting the possibility of O2 supply from arterioles. Furthermore, analysis of the diffusion process based on the PO2 drop has shown that the O2 diffusivity in the arteriolar wall was dramatically greater than in the tissue; thus, such a large O2 loss from arterioles seemed unlikely to be solely attributable to simple diffusion. To explain this discrepancy we hypothesized the O2 consumption by arteriolar walls was much higher than previously thought. In this study, we quantified the O2 consumption rate in arteriolar walls to evaluate its impact on the PO2 drop in the arterioles. Phosphorescence quenching microscopy was used to determine the intra- and perivascular PO2 values of rat cremaster arterioles both under normal condition and during vasodilation. Using the measured PO2 values, we calculated the O2 consumption rate of the arteriolar wall. Our results showed that 100 times more O2 is consumed by arteriolar walls, compared with in vitro vascular segments; consequently, O2 consumption by arteriolar walls could be the main cause of the PO2 drop in arterioles. Furthermore, we found the O2 consumption rate of the arteriolar walls under normal condition to be higher than during vasodilation and the O2 consumption to be dependent on the mechanical work of vascular smooth muscle. These findings suggested important roles of arterioles for O2 transport to tissue. Under resting skeletal muscle, to ensure blood supply to other organs with low systemic blood flow, the arterioles consume a large amount of O2 to restrict blood flow into skeletal muscle. While During exercise, arteriolar O2 consumption decreases as a result of vasodilation, thereby efficiently supplying O2 to the skeletal muscle of high O2 demand.

Original languageEnglish
Title of host publication13th Mediterranean Conference on Medical and Biological Engineering and Computing 2013 - MEDICON 2013
PublisherSpringer Verlag
Pages1033-1036
Number of pages4
ISBN (Print)9783319008455
DOIs
Publication statusPublished - 2014 Jan 1
Event13th Mediterranean Conference on Medical and Biological Engineering and Computing 2013, MEDICON 2013 - Seville, Spain
Duration: 2013 Sep 252013 Sep 28

Publication series

NameIFMBE Proceedings
Volume41
ISSN (Print)1680-0737

Conference

Conference13th Mediterranean Conference on Medical and Biological Engineering and Computing 2013, MEDICON 2013
CountrySpain
CitySeville
Period13/9/2513/9/28

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering

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  • Cite this

    Shibata, M., Hamashima, S., & Ichioka, S. (2014). Oxygen dynamics in microcirculation of skeletal muscle. In 13th Mediterranean Conference on Medical and Biological Engineering and Computing 2013 - MEDICON 2013 (pp. 1033-1036). (IFMBE Proceedings; Vol. 41). Springer Verlag. https://doi.org/10.1007/978-3-319-00846-2_256