Kathrine Knai

Norwegian University of Science and Technology | NTNU · Department of Circulation and Medical Imaging

The circulatory system is oscillatory in its nature. Oscillatory components linked to physiological processes and underlying regulatory mechanisms are identifiable in circulatory signals. Autonomic regulation is essential for the system's ability to deal with external exposure, and the integrity of oscillations may be considered a hallmark of a hea...

It is well-known that blood glucose oscillates with a period of approximately 15 min (900 s) and exhibits an overall complex behaviour in intact organisms. This complexity is not thoroughly studied, and thus, we aimed to decipher the frequency bands entailed in blood glucose regulation. We explored high-resolution blood glucose time-series sampled...

A table of time (sec) in column 1 and blood glucose values (mmol/l) in column 2 from the entire recording in Pig 3. (TXT)

A table of time (sec) in column 1 and blood glucose values (mmol/l) in column 2 from the entire recording in Pig 1. (TXT)

A table of time (sec) in column 1 and blood glucose values (mmol/l) in column 2 from the entire recording in Pig 4. (TXT)

A table of time (sec) in column 1 and blood glucose values (mmol/l) in column 2 from the entire recording in Pig 2. (TXT)

Continuous biological signals, like blood pressure recordings, exhibit non-linear and non-stationary properties which must be considered when analyzing them. Heart rate variability analyses have identified several frequency components and their autonomic origin. There is need for more knowledge on the time-changing properties of these frequencies....

Background: The aim of this study was to construct a non-invasive model for acute right ventricular afterload increase by hypoxic pulmonary vasoconstriction. Intact animal models are vital to improving our understanding of the pathophysiology of acute right ventricular failure. Acute right ventricular failure is caused by increased afterload of th...