Results of research of bioelectric brain activity and heart rate activity of patients with eye nystagmus with simultaneous registration of nystagmograms, electroencephalograms and electrocardiograms are given. It is shown that at periodic influence of light on the eyes of patients the interconnected reduction of amplitudes of spectral components of electrocardiograms and electrocardiograms power spectra are observed
Usanova Т.В., Nikolenko V.N., Skripal A.V. Study of bioelectric brain activity and characteristics of heart activity in nystagmus suppressing by periodic light action // Saratov Journal of Medical Scientific Research, Vol. 7, Issue 1, 2011, pp. 97-102

We investigate synchronization between the low-frequency oscillations of heart rate and blood pressure having in humans a basic frequency close to 0.1 Hz. A method is proposed for quantitative estimation of synchronization between these oscillating processes based on calculation of relative time of phase synchronization of oscillations. It is shown that healthy subjects exhibit on average substantially longer epochs of internal synchronization between the low-frequency oscillations in heart rate and blood pressure than patients after acute myocardial infarction.
Chaos, 2009; 19: 033112