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Healthy lifestyle and heart rate variability in young adults
Stefanie Aeschbacher1, Matthias Bossard2, Francisco Javier Ruperti Repilado1
1Division of Internal Medicine, University Hospital Basel, Switzerland Cardiovascular Research Institute Basel, University Hospital Basel, Switzerland.
Background:
We aimed to determine the association of a comprehensive healthy lifestyle with heart rate variability (HRV), a validated measure of autonomic function.
Design:
This was a prospective cohort study.
Methods:
A population-based sample of 2079 individuals aged 25-41 years without prevalent cardiovascular disease was investigated. The standard deviation of all normal RR intervals (SDNN) during 24-hour electrocardiography was used as main HRV marker. Healthy lifestyle metrics were summed to a validated lifestyle-score ranging from 0 = most unhealthy to 7 = most healthy. One point was given for each of the following items: never smoking cigarettes; consuming a healthy diet; performing moderate (≥150 min/week) or vigorous (≥75 min/week) physical activity; body mass index (BMI)<25 kg/m(2); total cholesterol<200 mg/dl; glycated haemoglobin A1c<5.7%; and blood pressure<120 (systolic) and <80 mm Hg (diastolic).
Results:
Median age of the participants (47% males) was 37 years. Mean SDNN was 153 ms and median lifestyle-score was four. A score of 0/1 or 6/7 was found in 5.2% and 11.0%, respectively. In multivariable linear regression analysis with SDNN as the outcome variable, the β-estimate (95% confidence interval (CI)) for a one-point increase of the lifestyle-score was 0.14 (0.11-0.17), p < 0.0001. This relationship was attenuated but remained significant after additional adjustment for resting heart rate (HR) (β-estimate (95% CI) 0.07 (0.07-0.10), p < 0.0001) or 24-hour HR (0.04 (0.01-0.07), p = 0.003).
Conclusions:
Few individuals adopted a healthy lifestyle in this large contemporary cohort of young adults from the general population. Adopting a healthy lifestyle has an important effect on autonomic function.
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