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This article presents a method of extracting repeating sequences belonging to an ε-tube for a given ε from the impulse signals generated by heart of man. The method was developed by the authors in 1970s and enables us to identify repeating pieces, words (or patterns or matrices), in the rows of RRintervals of electrocardiograms. There are 15 types of Poincare plot of the heart rhythm, constructed at the same time, using 342 sequences of RR intervals of 309 patients. Using night data (at rest) of the 24 hour records of RR-intervals 216 patients are installed repeatability of these15 types of Poincaré plot. The authors also identified 15 types of Poincare plot for the heart rate, the analysis of which allowed authors to see geometric figures that look like letters and other symbols used in written language, as well as parts of circles or ellipses. For one of these 15 types of Poincaré plot rhythm of the heart, which was found in 29 patients, a high one was detected up to hundred times, the frequency of triads and quadruples of RR-intervals.

Linguistic Analysis of Human Heart Rate and 15 Types of its Poincaré Plots