Why the study?
Do task-induced stress conditions alter the genetic and environmental variance of respiratory sinus arrhythmia in adolescent twins compared to rest?
Population
160 adolescent twin pairs (n=320 individuals, ages 14-20 years) living in Amsterdam and neighboring cities.
Comparison
Mental arithmetic and reaction time tasks vs Resting conditions
Design
Cross-sectional
Authors
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Task conditions may better isolate genetic vagal influences in adolescents; extends twin heritability research by showing reduced environmental variance under stress.
Do task-induced stress conditions alter the genetic and environmental variance of respiratory sinus arrhythmia in adolescent twins compared to rest?
Individual differences in vagal tone that are genotype-dependent are better assessed during task conditions than during resting conditions due to decreased environmental variance.
Boomsma et al. (1990) studied this question.
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