title: Ethnic differences in heart rate variability: does ultralow-frequency heart rate variability really measure autonomic tone?
authors.forename: Julian F
authors.initials: JF
authors.lastname: Thayer
authors.forename: Xiaoling
authors.initials: X
authors.lastname: Wang
authors.forename: Harold
authors.initials: H
authors.lastname: Snieder
mesh_terms: D001741:Black or African American / Q000208:ethnology; D001341:Autonomic Nervous System / Q000502:physiology*; D005006:Ethnicity / Q000208:ethnology*; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D012107:Research Design; D044465:White People / Q000208:ethnology