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Cardiac parasympathic function

Jean Marsac
Heart rate variability (HRV) is a noninvasive, practical and reproducible measure of autonomic nervous system function. Although the heart is reasonably stable, the time between two beats (R-R) can be very different. HRV is the time variation between two consecutive heartbeats. HRV is believed to correspond to the balance between the sympathic and parasympathic influences on the intrinsic rhythm of the sinoatrial node. HRV is influenced by lifestyle factors, including physical activity, eating habits, sleep pattern, and smoking...
January 2013: Bulletin de L'Académie Nationale de Médecine
E K Grasser, N Goswami, H Hinghofer-Szalkay
We investigated non-invasively cardiac contractility and autonomic nervous activity during presyncopal orthostatic stress induced in healthy humans. A graded orthostatic stress (GOS) paradigm, consisting of head-up tilt (HUT) combined with lower body negative pressure (LBNP) of increasing magnitude, was used to reach a presyncopal end-point in 15 healthy adults. Continuous beat-to-beat hemodynamic and autonomic parameters were recorded. From supine control (C1) to presyncope (PS), total peripheral resistance index (TPRI) decreased from 2300+/-500 to 1910+/-320 dyne*s*m(2)/cm(5) (p=0...
2009: Physiological Research
V I Fedorova
The paper presents the results of the investigation of psychoautonomic correlations in 15 patients with psychogenic asthenia. Spilberg's and Beck's tests as well as autonomic questionnaire were used for the psychologic testing. Sympathic-parasympathic correlations were investigated by means of cardiovascular tests, by evoked skin sympathetic potentials, variability of cardiac rhythm under conditions of different functional states. The patients had mild anxious-depressive and pronounced autonomic disorders with prevalence of cerebral sympathic-adrenal impacts, elevation of vagal influences in cardiovascular system, mediatory insufficiency of the sympathic sweating nerves and a decrease of the adaptive abilities of the regulatory systems...
2000: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
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