Results 221 to 230 of about 325,226 (263)
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Depression and heart rate variability
Biological Psychiatry, 1995Since there is evidence suggesting an increased incidence of cardiovascular morbidity in patients with major depression and phobic anxiety (Dalack et al 1990: Kawachi et al 1994), we have been conducting studies on cardiac autonomic function in these disorders using noninvasive techniques such as spectral analysis of heart rate (HR).
V K, Yeragani +3 more
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Heart Rate Variability and Swimming
Sports Medicine, 2014Professionals in the domain of swimming have a strong interest in implementing research methods in evaluating and improving training methods to maximize athletic performance and competitive outcome. Heart rate variability (HRV) has gained attention in research on sport and exercise to assess autonomic nervous system activity underlying physical ...
Julian, Koenig +4 more
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Heart rate variability: a review
Medical & Biological Engineering & Computing, 2006Heart rate variability (HRV) is a reliable reflection of the many physiological factors modulating the normal rhythm of the heart. In fact, they provide a powerful means of observing the interplay between the sympathetic and parasympathetic nervous systems.
U. Rajendra Acharya +4 more
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Heart rate variability in weightlifters
Human Physiology, 2009On the basis of the literature and original data, heart rate variability (HRV) in weightlifters has been studied. The results showed that the distribution mode (a parameter of mathematical analysis that is equal to the most frequent length of RR intervals) indicates the intensity of physical exercise.
E V, Oreshnikov +2 more
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An Analysis of Heart Rate Variability
Ergonomics, 1973Proceeding from a formal definition of heart rate variability, some mathematical and statistical techniques from sampling statistics and time series analysis for the analytical evaluation of heart rate variability for ergonomics purposes are presented and compared. The concept of sampling statistics gives a measure of heart rate variability, arrived at
H, Luczak, W, Laurig
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Heart rate variability in pheochromocytoma
The American Journal of Cardiology, 1995The results of our study show that parasympathetic tone was higher in patients with pheochromocytoma than in patients with primary hypertension. An unusual spectral form of vagal activity was seen during excessive beta-adrenergic stimulation, while persistent hypertension with an excessive alpha-adrenergic stimulation was responsible for low cardiac ...
B, Dabrowska +4 more
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Migraine and Heart Rate Variability
Archives of Internal Medicine, 2007We report preliminary data from our study showing the presence of cardiac autonomic dysfunction in subjects with migraine. A total of 28 subjects (18 women and 10 men; mean±SD age, 36±4.2 years) with active migraine with aura, diagnosed according to criteria of the International Headache Society, were enrolled.The data show that subjects with active ...
PERCIACCANTE A +4 more
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Heart Rate Variability in Athletes
Sports Medicine, 2003This review examines the influence on heart rate variability (HRV) indices in athletes from training status, different types of exercise training, sex and ageing, presented from both cross-sectional and longitudinal studies. The predictability of HRV in over-training, athletic condition and athletic performance is also included.
André E, Aubert +2 more
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Thermoregulation and Heart Rate Variability
Clinical Science, 19961. Heart rate variability is modulated by multiple control systems, including autonomic and hormonal systems. Long-term variability, i.e. the very low-frequency band of the power spectra, has been postulated to reflect thermoregulatory vasomotor control, based upon thermal entrainment experiments.
L A, Fleisher +5 more
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Multifractality and heart rate variability
Chaos: An Interdisciplinary Journal of Nonlinear Science, 2009In this paper, we participate to the discussion set forth by the editor of Chaos for the controversy, “Is the normal heart rate chaotic?” Our objective was to debate the question, “Is there some more appropriate term to characterize the heart rate variability (HRV) fluctuations?” We focused on the ≈24 h RR series prepared for this topic and tried to ...
Sassi R. +2 more
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