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Analysis of right ventricular function in the exercising horse: use of the Fourier Transform
Author(s) -
Weigle G. E.,
Langsetmo I.,
Gallagher R. R.,
Dyer R. A.,
Erickson H. H.,
Fedde M. R.
Publication year - 2000
Publication title -
equine veterinary journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.82
H-Index - 87
eISSN - 2042-3306
pISSN - 0425-1644
DOI - 10.2746/042516400777591633
Subject(s) - stride , frequency domain , fourier transform , horse , waveform , signal (programming language) , mathematics , time domain , fourier analysis , medicine , cardiology , computer science , mathematical analysis , physical medicine and rehabilitation , biology , telecommunications , paleontology , radar , computer vision , programming language
Summary The objective of this study was to develop and test a technique to allow dynamic cardiac function to be studied during exercise in the horse. Blood pressure waveforms in the exercising horse are difficult to interpret because of the large influence of stride and respiration. A method has been devised to study dynamic right ventricular variables during high‐speed exercise in the horse. A Fast Fourier Transform was performed on the digitised pressure waveforms and the frequency components associated with stride and respiration were removed. An inverse Fourier Transform was then performed to generate a time‐domain pressure signal. Several dynamic right ventricular variables were calculated using the derived signal. Various parameters associated with removing frequencies from the frequency‐domain pressure signal were changed to determine their influence on the variables. Most of the variables were not sensitive to these parameters. When compared during separate exercise bouts, some variables differed among runs, while others were not significantly different. Using the signal separation technique described here, right ventricular function of an exercising horse can be critically analysed.