Detection and significance of a discrete very low frequency rhythm in RR interval variability in chronic congestive heart failure
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Comparison of frequency domain measures based on spectral decomposition for spontaneous baroreflex sensitivity assessment after Acute Myocardial Infarction
2021, Biomedical Signal Processing and ControlCitation Excerpt :This behavior is expected in response to tilt, as the sympathetic activation induced by the orthostatic stress is known to reduce the variability of RR in the VLF and especially HF bands and thus to isolate the power content in the LF band [48,51]. Moreover, the effect may be emphasized in AMI patients where confounding effects may arise also from the VLF band; in fact, the presence of important VLF rhythms has been put in relation to the markedly impaired autonomic control of cardiovascular system, down-regulation of baroreceptor function and enhancement of chemosensitivity, especially in subjects presenting a more augmented sympathetic tone and attenuated baroreflex activity [49]. The other differences observed between the global and local approaches mostly concern comparisons involving the Old group; these may be explained also by the small size of this group (see Section 4.4).
Behavioural and cardiac responses towards different novel objects in juvenile female and male pigs (Sus scrofa)
2019, Applied Animal Behaviour ScienceCitation Excerpt :While the HF component is exclusively associated with the parasympathetic branch of the ANS, the LF component encompasses both parasympathetic and sympathetic elements. Therefore the physiological meaning of the LF component is much debated, as it can easily be influenced by other physiological measures such as thermoregulation and myogenic activity of vessels (Ponikowski et al., 1996; Von Borell et al., 2007). A rise in RMSSD is commonly associated with activation of the parasympathic nervous system (Boissy et al., 2007; Zebunke et al., 2013) found that pigs reacted with an elevated RMSSD value to being called for feeding and explained their finding with a positively valenced anticipation of the food.
Chemo- and ergoreflexes in health, disease and ageing
2005, International Journal of CardiologyRedistribution of power spectrum of heart rate variability during acute umbilical artery embolism and hypoxemia in late-gestation fetal sheep
2004, European Journal of Obstetrics and Gynecology and Reproductive BiologyPrognostic Value of Heart Rate Variability in Patients with Hypertrophic Cardiomyopathy
2003, Journal of Electrocardiology