Why the study?
What is the relative contribution of genetic versus environmental factors to heart rate variability in middle-aged men?
Population
504 middle-aged male twins (208 monozygotic [104 healthy] and 296 dizygotic [173 healthy])
Design
Cross-sectional
Authors
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Predominant genetic influence on HRV warrants caution in attributing changes to modifiable factors; leaves open prospective confirmation in diverse cohorts.
What is the relative contribution of genetic versus environmental factors to heart rate variability in middle-aged men?
Genetic factors account for a major portion of interindividual differences in heart rate variability, with environmental and behavioral determinants having a minimal influence.
Uusitalo et al. (2007) studied this question.
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