Journal ArticleDOI
Quantification of scaling exponents and crossover phenomena in nonstationary heartbeat time series
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TLDR
A new method--detrended fluctuation analysis (DFA)--for quantifying this correlation property in non-stationary physiological time series is described and application of this technique shows evidence for a crossover phenomenon associated with a change in short and long-range scaling exponents.Abstract:
The healthy heartbeat is traditionally thought to be regulated according to the classical principle of homeostasis whereby physiologic systems operate to reduce variability and achieve an equilibrium-like state [Physiol. Rev. 9, 399-431 (1929)]. However, recent studies [Phys. Rev. Lett. 70, 1343-1346 (1993); Fractals in Biology and Medicine (Birkhauser-Verlag, Basel, 1994), pp. 55-65] reveal that under normal conditions, beat-to-beat fluctuations in heart rate display the kind of long-range correlations typically exhibited by dynamical systems far from equilibrium [Phys. Rev. Lett. 59, 381-384 (1987)]. In contrast, heart rate time series from patients with severe congestive heart failure show a breakdown of this long-range correlation behavior. We describe a new method--detrended fluctuation analysis (DFA)--for quantifying this correlation property in non-stationary physiological time series. Application of this technique shows evidence for a crossover phenomenon associated with a change in short and long-range scaling exponents. This method may be of use in distinguishing healthy from pathologic data sets based on differences in these scaling properties.read more
Citations
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Reproductive performance and diving behaviour share a common sea-ice concentration optimum in Adélie penguins (Pygoscelis adeliae).
Camille Le Guen,Akiko Kato,Ben Raymond,Christophe Barbraud,Michaël Beaulieu,Charles-André Bost,Karine Delord,Andrew J. J. MacIntosh,Xavier Meyer,Thierry Raclot,Michael D. Sumner,Akinori Takahashi,Akinori Takahashi,Jean-Baptiste Thiebot,Yan Ropert-Coudert +14 more
TL;DR: It is suggested that sea-ice cover is likely to affect the reproductive performance of Adélie penguins through its effects on foraging behaviour, as breeding success and most diving parameters share a common optimum.
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Impact of sedation and organ failure on continuous heart and respiratory rate variability monitoring in critically ill patients: a pilot study.
TL;DR: The results suggest that both heart rate variability and respiratory rate variability increased during sedation interruption, and the further reduction in respiratory variability during the elimination of sedation in patients with high multiple organ dysfunction syndrome suggests a differential response and benefit from sedation interrupted, and merits further investigation.
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Heart and soul: heart rate variability and major depression.
TL;DR: The direct relationship between HRV alterations and psychiatric symptoms, rather than its relationship with CVD, is focused on, as this has been reviewed elsewhere.
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Fractal gait patterns are retained after entrainment to a fractal stimulus.
Christopher K. Rhea,Adam W. Kiefer,Adam W. Kiefer,Matthew W. Wittstein,Kelsey B. Leonard,Ryan MacPherson,W. Geoffrey Wright,F. Jay Haran +7 more
TL;DR: Fractal gait patterns were strengthened during the synchronization phase and were retained in the post-synchronization phase and it was shown that a discrete visual stimulus is a better method to influence retention.
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Long-range correlation in cosmic microwave background radiation.
TL;DR: It is concluded that the multifractality nature of the temperature fluctuation of CMB radiation is mainly due to the long-range correlations, and the map is consistent with a gaussian distribution.
References
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Long-range correlations in nucleotide sequences
Chung-Kang Peng,Sergey V. Buldyrev,Ary L. Goldberger,Shlomo Havlin,Shlomo Havlin,Francesco Sciortino,Michael Simons,Michael Simons,H. E. Stanley +8 more
TL;DR: This work proposes a method for studying the stochastic properties of nucleotide sequences by constructing a 1:1 map of the nucleotide sequence onto a walk, which it refers to as a 'DNA walk', and uncovers a remarkably long-range power law correlation.
Journal ArticleDOI
Long-range anticorrelations and non-Gaussian behavior of the heartbeat
Chung-Kang Peng,Chung-Kang Peng,Chung-Kang Peng,J. Mietus,J. Mietus,J. Mietus,Jeffrey M. Hausdorff,Jeffrey M. Hausdorff,Jeffrey M. Hausdorff,Shlomo Havlin,Shlomo Havlin,Shlomo Havlin,H. E. Stanley,H. E. Stanley,H. E. Stanley,Ary L. Goldberger,Ary L. Goldberger,Ary L. Goldberger +17 more
TL;DR: It is found that the successive increments in the cardiac beat-to-beat intervals of healthy subjects display scale-invariant, long-range anticorrelations (up to 10(4) heart beats), and the different scaling behavior in health and disease must relate to the underlying dynamics of the heartbeat.