Article
An exploration of the genetic and environmental etiology of heart rate in infancy and middle childhood.
Twin research : the official journal of the International Society for Twin Studies - 1 Dec 2000
Van Hulle C A, Corley R, Zahn-Waxler C, Kagan J, Hewitt J K
Abstract excerpt
Heart rate was recorded on 210 MZ and 174 DZ same sex twin pairs participating in the MacArthur Longitudinal Twin Study (MALTS) at age 14, 20, 24, 36 months and 7 years. Heart rate was monitored in the laboratory at all ages. At ages 14 to 36 months, heart rate was monitored prior to a set of cognitive tasks. At age 7 years heart rate was recorded during a mood-eliciting videotaped presentation. At this age only...
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