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    Effects of sympathetic activation and regular periodic breathing on complexity of heart period variability

    Background. Heart rate exhibits different levels of complexity which are probably related to the neural autonomic modulation. Aim of the study. The aim is to analyze the effect of the sympathetic activation and ...

    A. Porta, R. Magatelli, E. Borroni in Herzschrittmachertherapie und Elektrophysi… (2000)