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Effects of guided breath exercise on complex behaviour of heart rate dynamics
Author(s) -
Tavares Bruna S.,
Paula Vidigal Giovanna,
Garner David M.,
Raimundo Rodrigo D.,
Abreu Luiz Carlos,
Valenti Vitor E.
Publication year - 2017
Publication title -
clinical physiology and functional imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.608
H-Index - 67
eISSN - 1475-097X
pISSN - 1475-0961
DOI - 10.1111/cpf.12347
Subject(s) - heart rate variability , medicine , fractal dimension , correlation dimension , heart rate , cardiology , fractal analysis , autonomic nervous system , poincaré plot , fractal , mathematics , blood pressure , mathematical analysis
Summary Introduction Cardiac autonomic regulation is influenced by changes in respiratory rate, which has been demonstrated by linear analysis of heart rate variability ( HRV ). Conversely, the complex behaviour is not well defined for HRV during this physiological state. In this sense, Higuchi Fractal Dimension is applied directly to the time series. It analyses the fractal dimension of discrete time sequences and is simpler and faster than correlation dimension and many other classical measures derived from chaos theory. We investigated chaotic behaviour of heart rate dynamics during guided breath exercises. Method We investigated 21 healthy male volunteers aged between 18 and 30 years. HRV was analysed 10 min before and 10 min during guided breath exercises. HRV was analysed in the time and frequency domain for linear analysis and through HFD for non‐linear analysis. Results Linear analysis indicated that SDNN , pNN 50, RMSSD , LF , HF and LF / HF increased during guided breath exercises. HFD analysis illustrated that between K max 20 to K max 120 intervals, was enhanced during guided breath exercises. Conclusion Guided breath exercises acutely increased chaotic behaviour of HRV measured by HFD .