Why the study?
Does heavy cigarette smoking alter heart rate variability compared to nonsmokers?
Does heavy cigarette smoking alter heart rate variability compared to nonsmokers?
Heavy cigarette smoking is associated with blunted vagal modulation of the heart, as evidenced by reduced heart rate variability, particularly during parasympathetic maneuvers.
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Reduced HRV in heavy smokers may signal vagal withdrawal; leaves open whether cessation restores autonomic balance in prospective studies.
Barutçu et al. (2005) studied this question.
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