Comparison of RR-interval scaling exponents derived from long and short segments at different wake periods

Physiological Measurement
J C EcheverriaR González-Camarena

Abstract

Heartbeat fluctuations show fractal-like correlations that are associated with highly adaptive cardiovascular regulatory systems. Moreover, the short-range fractal or scaling exponent alpha(1) extracted from these correlations has been found to be a predictor of mortality for subjects with an impaired left ventricular function. In general, the RR-interval data required for this analysis are derived from long-term ECG recordings during free-running conditions. Yet short-term recordings are more likely to be obtained in some practical circumstances, so becoming relevant to assess the possibility of obtaining representative alpha(1) exponents from these recordings. Here, we compare the alpha(1) exponents extracted from the RR-interval series (9:00 AM-6:00 PM) of 51 healthy adults in normal sinus rhythm and the alpha(1) calculated from three shorted segments of only 700 beats obtained from the same series at 9:00 AM, 1:30 PM and 5:00 PM. We found no significant differences between the scaling exponents derived from the whole 9 h series and the short segments at 9:00 AM and 5:00 PM, but did find significant differences when comparing the whole series with the short segment at 1:30 PM. Thus, only if the time of day is taken into cons...Continue Reading

References

Jan 14, 1999·The American Journal of Physiology·B Pilgram, D T Kaplan
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Dec 22, 2004·Proceedings of the National Academy of Sciences of the United States of America·Kun HuSteven A Shea

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Citations

Feb 3, 2009·Medical & Biological Engineering & Computing·M A PeñaR González-Camarena
Dec 18, 2012·Medical & Biological Engineering & Computing·M R OrtizR González-Camarena
Feb 11, 2009·IEEE Transactions on Bio-medical Engineering·Daniel T SchmittPlamen Ch Ivanov
Apr 6, 2016·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Aijing LinPlamen Ch Ivanov
Dec 2, 2006·Prenatal Diagnosis·M R OrtizJ C Echeverría
Aug 27, 2009·Physiological Measurement·J C EcheverríaR González-Camarena
Aug 3, 2007·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Daniel T Schmitt, Plamen Ch Ivanov

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