Heart rate variability and heart rate in healthy volunteers. Is the female autonomic nervous system cardioprotective? (original) (raw)
Journal Article
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Department of Cardiology, Gasthuisberg University Hospital, Catholic University of Leuven, Leuven, Belgium
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Department of Cardiology, Gasthuisberg University Hospital, Catholic University of Leuven, Leuven, Belgium
Search for other works by this author on:
,
Department of Cardiology, Gasthuisberg University Hospital, Catholic University of Leuven, Leuven, Belgium
Search for other works by this author on:
,
Department of Cardiology, Gasthuisberg University Hospital, Catholic University of Leuven, Leuven, Belgium
Search for other works by this author on:
Department of Cardiology, Gasthuisberg University Hospital, Catholic University of Leuven, Leuven, Belgium
Search for other works by this author on:
Published:
01 September 1998
Cite
D. Ramaekers, H. Ector, A.E. Aubert, A. Rubens, F. Van de Werf, Heart rate variability and heart rate in healthy volunteers. Is the female autonomic nervous system cardioprotective?, European Heart Journal, Volume 19, Issue 9, 1 September 1998, Pages 1334–1341, https://doi.org/10.1053/euhj.1998.1084
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Abstract
Aims
Heart rate variability has been proposed as an indicator of cardiovascular health. Since women have a lower cardiovascular risk, we hypothesized that there are gender differences in autonomic modulation.
Methods and Results
In 276 healthy subjects (135 women, 141 men) between 18 and 71 years of age, 24h heart rate and heart rate variability were determined. All heart rate variability parameters, except for pNN50 and high frequency power, were higher in men. After adjustment for heart rate, we obtained gender differences for: the standard deviation (_P_=0·049), the standard deviation of the 5min average (_P_=0·047), low frequency power (absolute values,_P_=0·002; normalized units,P<0·001) and ratio low frequency/high frequency (P<0·001). There were no significant gender differences in heart rate variability parameters denoting vagal modulation. Gender differences were confined to age categories of less than 40 years of age. The majority of heart rate variability parameters decreased with age. Only in men, was a higher body mass index associated with a higher heart rate and with lower heart rate variability parameters (P<0·001).
Conclusion
Cardiac autonomic modulation as determined by heart rate variability, is significantly lower in healthy women compared to healthy men. We hypothesize that this apparently paradoxical finding may be explained by lower sympathetic activity (low frequency power) in women. This may provide protection against arrhythmias and against the development of coronary heart disease.
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Correspondence: H. Ector, Department of Cardiology, Gasthuisberg University Hospital, Herestraat 49, B-3000 Leuven, Belgium.
The European Society of Cardiology
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