MURAL - Maynooth University Research Archive Library



    Dynamic relationship between sympathetic nerve activity and renal blood flow: a frequency domain approach


    Guild, Sarah-Jane and Austin, Paul C. and Navakatikyan, Michael and Ringwood, John and Malpas, Simon C. (2001) Dynamic relationship between sympathetic nerve activity and renal blood flow: a frequency domain approach. American Journal of Physiology - Regulatory, Integrative and Comparative Physiology, 281 (1). R206-R212. ISSN 0363-6119

    [img]
    Preview
    Download (391kB) | Preview


    Share your research

    Twitter Facebook LinkedIn GooglePlus Email more...



    Add this article to your Mendeley library


    Abstract

    Blood pressure displays an oscillation at 0.1 Hz in humans that is well established to be due to oscillations in sympathetic nerve activity (SNA). However, the mechanisms that control the strength or frequency of this oscillation are poorly understood. The aim of the present study was to define the dynamic relationship between SNA and the vasculature. The sympathetic nerves to the kidney were electrically stimulated in six pentobarbital-sodium anesthetized rabbits, and the renal blood flow response was recorded. A pseudo-random binary sequence (PRBS) was applied to the renal nerves, which contains equal spectral power at frequencies in the range of interest (<1 Hz). Transfer function analysis revealed a complex system composed of low-pass filter characteristics but also with regions of constant gain. A model was developed that accounted for this relationship composed of a 2 zero/4 pole transfer function. Although the position of the poles and zeros varied among animals, the model structure was consistent. We also found the time delay between the stimulus and the RBF responses to be consistent among animals (mean 672 ± 22 ms). We propose that the identification of the precise relationship between SNA and renal blood flow (RBF) is a fundamental and necessary step toward understanding the interaction between SNA and other physiological mediators of RBF.

    Item Type: Article
    Keywords: Modeling; pseudo-random binary sequence;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Item ID: 8832
    Depositing User: Professor John Ringwood
    Date Deposited: 19 Sep 2017 13:54
    Journal or Publication Title: American Journal of Physiology - Regulatory, Integrative and Comparative Physiology
    Publisher: American Physiological Society
    Refereed: Yes
    URI:

    Repository Staff Only(login required)

    View Item Item control page

    Downloads

    Downloads per month over past year