TY - JOUR
T1 - Fractal fluctuations in cardiac time series
AU - West, B. J.
AU - Zhang, R.
AU - Sanders, A. W.
AU - Miniyar, S.
AU - Zuckerman, J. H.
AU - Levine, B. D.
N1 - Funding Information:
The authors would like to thank the Office of Naval Research and NIH Neurolab Grant HL53206-03 for partial support of this work.
PY - 1999/8/15
Y1 - 1999/8/15
N2 - Human heart rate, controlled by complex feedback mechanisms, is a vital index of systematic circulation. However, it has been shown that beat-to-beat values of heart rate fluctuate continually over a wide range of time scales. Herein we use the relative dispersion, the ratio of the standard deviation to the mean, to show, by systematically aggregating the data, that the correlation in the beat-to-beat cardiac time series is a modulated inverse power law. This scaling property indicates the existence of long-time memory in the underlying cardiac control process and supports the conclusion that heart rate variability is a temporal fractal. We argue that the cardiac control system has allometric properties that enable it to respond to a dynamical environment through scaling.
AB - Human heart rate, controlled by complex feedback mechanisms, is a vital index of systematic circulation. However, it has been shown that beat-to-beat values of heart rate fluctuate continually over a wide range of time scales. Herein we use the relative dispersion, the ratio of the standard deviation to the mean, to show, by systematically aggregating the data, that the correlation in the beat-to-beat cardiac time series is a modulated inverse power law. This scaling property indicates the existence of long-time memory in the underlying cardiac control process and supports the conclusion that heart rate variability is a temporal fractal. We argue that the cardiac control system has allometric properties that enable it to respond to a dynamical environment through scaling.
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U2 - 10.1016/S0378-4371(99)00175-2
DO - 10.1016/S0378-4371(99)00175-2
M3 - Article
C2 - 11542384
AN - SCOPUS:0033566475
SN - 0378-4371
VL - 270
SP - 552
EP - 566
JO - Physica A: Statistical Mechanics and its Applications
JF - Physica A: Statistical Mechanics and its Applications
IS - 3
ER -