Respiratory sinus arrhythmia as a second order system |
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Authors: | Dejan
iki |
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Affiliation: | a Institute of Biophysics, Faculty of Medicine, University of Belgrade, Belgrade, Serbia & Montenegro |
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Abstract: | The presented study describes the influence of respiration on heart rate, under controlled respiration conditions. In addition, this study makes a comparison of a simple physical model, the spring-mass system, with the biophysics of respiration. It is possible to use the equations describing the behaviour of the respiratory system, under certain conditions, and analyse them in a way similar to the equations that describe the physical spring-mass system. The results of the heart rate and respiration measurements effected on 10 subjects at various respiration frequencies show us that the heart rate behaves as a second order system within the boundary conditions during a longer period of constant respiration. The results also show that the heart rate behaves as a second order system within the intermediate mode during short time intervals when there is no respiration. |
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Keywords: | Respiration heart rate second order system physical model ECG |
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