AI Article Synopsis
- The study examines cardiac dynamics during sleep and wakefulness for healthy individuals, cosmonauts in space, and those with severe heart disease.
- During sleep, all groups showed increased anticorrelation in heartbeat fluctuations compared to wakefulness.
- Differences in scaling exponents between sleep and wake periods are similar to those found between healthy and diseased individuals, indicating that changes in heartbeat regulation are linked to neuroautonomic control rather than just activity levels.
Article Abstract
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.
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| http://dx.doi.org/10.1209/epl/i1999-00525-0 | DOI Listing |
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