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. 2009 Aug 13;8:17. doi: 10.1186/1475-925X-8-17

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Copyright © 2009 Karmakar et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Underlying temporal dynamics of a Poincaré plot. Poincaré plots with similar SD1 and SD2 values with different temporal structure are shown. Top panel (A and B) shows the Poincaré plots (lag-m = 2) of two different RR intervals series of length N (N = 1000) with SD1 (0.0424 and 0.0425) and SD2 (0.1185 and 0.1185) values. The underlying temporal dynamics of first 20 points of the same RR intervals are shown in the bottom panel (C and D), which shows the visible difference among them.