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Variations of heart cycles reflect complex dynamic cardiocirculatory regulatory systems in humans. Exposure to tobacco from cigarettes has been shown to elicit specific alterations of heart rate variability parameters leading to predominance of sympathetic and decreasing parameters of parasympathetic measures of cardiac autonomic nervous system tone.

Linear Short-Term Heart Rate Variability Parameters of Subjects Tobacco Cigarette Smokers and Subjects Nonsmokers in Preoperative Period