Volume 48, Number 5, December 1999
|Page(s)||594 - 600|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 September 2002|
Sleep-wake differences in scaling behavior of the human heartbeat: Analysis of terrestrial and long-term space flight data
Center for Polymer Studies and Department of Physics, Boston University, Boston, MA 02215, USA
2 Cardiovascular Division, Harvard Medical School, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA
3 Institute für Theoretische Physik III, Justus-Liebig-Universität - Giessen, Germany
4 Gonda Goldschmid Center and Department of Physics, Bar-Ilan University, Ramat Gan, Israel
5 Life Sciences Research Laboratories, Lyndon B. Johnson Space Center, Houston, TX 77058, USA
6 Institute of Biomedical Problems - Moscow, Russia
Accepted: 23 September 1999
We compare scaling properties of the cardiac dynamics during sleep and wake periods for healthy individuals, cosmonauts during orbital flight, and subjects with severe heart disease. For all three groups, we find a greater degree of anticorrelation in the heartbeat fluctuations during sleep compared to wake periods. The sleep-wake difference in the scaling exponents for the three groups is comparable to the difference between healthy and diseased individuals. The observed scaling differences are not accounted for simply by different levels of activity, but appear related to intrinsic changes in the neuroautonomic control of the heartbeat.
PACS: 87.19.Hh – Cardiac dynamics / 87.19.Jj – Circadian rhythms / 87.10.+e – Biological and medical physics: General theory and mathematical aspects
© EDP Sciences, 1999
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