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Spectral decomposition of the heart rate variability during whole night recordings was obtained, in order to assess the characteristic fluctuations in the heart rate and their spectral parameters during REM and NREM sleep stages. A time-varying autoregressive model was used in the analysis since it allows both real time and transitory episodes evaluation of spectral parameters of the heart rate variability...
Beyond the fundamental pathogenetic importance of Helicobacter Pylori a possible additional role of vagal innervation in favouring or modulating the clinical history of duodenal ulcer (DU) has been suggested by old studies employing invasive methodologies. Aim of this study was to assess whether vagal prevalence in autonomic modulation was present in healed DU patients (n=20) as compared to controls,(n=50),...
An automatic procedure is presented for processing heart rate variability (HRV, taken from the ECG) and respiration of diabetic subjects with or without neuropathy. Spectral analysis is carried out using autospectra, cross-spectra, and coherence parametric methods (based on autoregressive modeling). Spectral parameters, and in particular the power associated with low-frequency and high-frequency bands,...
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