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Experimental observation of Arnold tongues in the analysis of the signal from contour of the autonomous regulation of heart rate and respiration

We proposed a method of experimental observation of the Arnold tongues in the study of the synchronization of the contours of autonomic regulation of the heart rate with a characteristic frequency of about 0.1 Hz and respiration. The formulation of a special active experiment made it possible to determine the boundaries of synchronization tongues in 3 subjects. The method allows noninvasive research. The basic idea is to influence the contours of heart rate regulation with a respiratory signal, which has respiratory frequency varying linearly about 0.1 Hz according to the sound signal generated by a special device. The amplitude of the breath is changed by the subjects at the command of the researcher. The study is important for understanding the features of complex multichannel systems of biological nature and their mathematical modeling.