Search Results - subject:"Heart rate"

Yulmetyev, Renat M.; Demin, Sergey A.; Panischev, Oleg Yu. - In: Physica A: Statistical Mechanics and its Applications 353 (2005) C, pp. 336-352

In this paper, we consider the age-related alterations of heart rate variability on the basis of the study of non … about the reduction of relaxation rate with ageing and the higher degree of the Markovity of heart rate variability of …

Persistent link: https://www.econbiz.de/10011062018

Influence of the loss of time-constants repertoire in pathologic heartbeat dynamics

Guzmán-Vargas, L.; Muñoz-Diosdado, A.; Angulo-Brown, F. - In: Physica A: Statistical Mechanics and its Applications 348 (2005) C, pp. 304-316

We present a fractal analysis of diurnal heart interbeat time series from healthy young subjects and patients with congestive heart failure. We describe some differences between these groups by means of the calculation of some scale-invariant exponents. A previous simple model to reproduce the...

Persistent link: https://www.econbiz.de/10011063846

Sleep and wake phase of heart beat dynamics by artificial insymmetrised patterns

Dudkowska, A.; Makowiec, D. - In: Physica A: Statistical Mechanics and its Applications 336 (2004) 1, pp. 174-180

symmetries in a dot pattern, serves a tool for qualitative discrimination of heart rate states. …

Persistent link: https://www.econbiz.de/10010588858

A Bayesian classification of heart rate variability data

Muirhead, R.J; Puff, R.D - In: Physica A: Statistical Mechanics and its Applications 336 (2004) 3, pp. 503-513

sources. In particular, the method is used to address the question of whether a 24-h recording of human heart rate data is …

Persistent link: https://www.econbiz.de/10010591548

Type I intermittency in nonstationary systems—models and human heart rate variability

Żebrowski, J.J.; Baranowski, R. - In: Physica A: Statistical Mechanics and its Applications 336 (2004) 1, pp. 74-83

distribution characteristic for type I intermittency may be obtained in human heart rate variability data. The heart and its … features seen in the intermittency in human heart rate variability. Some technical problems with measuring laminar phase …

Persistent link: https://www.econbiz.de/10011064148

Model for the heart beat-to-beat time series during meditation

Capurro, A; Diambra, L; Malta, C.P - In: Physica A: Statistical Mechanics and its Applications 327 (2003) 1, pp. 168-173

We present a model for the respiratory modulation of the heart beat-to-beat interval series. The model consists of a pacemaker, that simulates the membrane potential of the sinoatrial node, modulated by a periodic input signal plus correlated noise that simulates the respiratory input. The model...

Persistent link: https://www.econbiz.de/10010591193

Description of complex time series by multipoles

Lewkowicz, M.; Levitan, J.; Puzanov, N.; Shnerb, N.; … - In: Physica A: Statistical Mechanics and its Applications 311 (2002) 1, pp. 260-274

We present a new method to describe time series with a highly complex time evolution. The time series is projected onto a two-dimensional phase–space plot which is quantified in terms of a multipole expansion where every data point is assigned a unit mass. The multipoles provide an efficient...

Persistent link: https://www.econbiz.de/10010590886

Geophysical Hazard for Human Health in the Circumpolar Auroral Belt: Evidence of a Relationship between Heart Rate Variation and Electromagnetic Disturbances

Chernouss, Sergey; Vinogradov, Antoly; Vlassova, Elvira - In: Natural Hazards 23 (2001) 2, pp. 121-135

disturbance of nervous and cardiovascular systems in the human body. The Heart Rate Variability (HRV) method providesa momentary … inhabitants and the variations of natural geomagnetic fields.A correlation between geomagnetic disturbances and heart rate was …

Persistent link: https://www.econbiz.de/10010759090

Relative complexity changes in time series using information measures

Torres, M.E.; Gamero, L.G. - In: Physica A: Statistical Mechanics and its Applications 286 (2000) 3, pp. 457-473

models. An example with heart rate variability signals is presented. The results obtained show that the entropic and the …

Persistent link: https://www.econbiz.de/10011059837

Fractal fluctuations in cardiac time series

West, B.J.; Zhang, R.; Sanders, A.W.; Miniyar, S.; … - In: Physica A: Statistical Mechanics and its Applications 270 (1999) 3, pp. 552-566

Human heart rate, controlled by complex feedback mechanisms, is a vital index of systematic circulation. However, it … has been shown that beat-to-beat values of heart rate fluctuate continually over a wide range of time scales. Herein we … indicates the existence of long-time memory in the underlying cardiac control process and supports the conclusion that heart …

Persistent link: https://www.econbiz.de/10010871999