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Familial and Individual Influences on Blood Pressure

Published online by Cambridge University Press:  01 August 2014

J. Sims*
Affiliation:
Department of Psychology, University of Birmingham, U.K.
J.K. Hewitt
Affiliation:
Department of Psychology, University of Birmingham, U.K.
K.A. Kelly
Affiliation:
Department of Medicine, University of Birmingham, U.K.
D. Carroll
Affiliation:
Department of Psychology, University of Birmingham, U.K.
J.R. Turner
Affiliation:
Department of Psychology, University of Birmingham, U.K.
*
Department of Psychology, University of Birmingham, P.O. Box 363, Birmingham B15 2TT, U.K.

Abstract

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Although familial aggregation of blood pressure is well documented, few studies have considered the changing contribution of genetic and environmental influences during adulthood. Applying maximum likelihood model fitting to blood pressure covariation in balanced pedigrees including both parents and their young adult twin offsprings (25 MZ, 32 DZ, aged between 16 and 24 years), it is shown that the increased variation in parents is explained by such developmental changes. For DBP, an apparent reduction in heritability from 68% to 38% from young adulthood to middle age results from the increasing impact of individual environmental experience (E1), with little or no influence from shared family environmental (E2). For SBP, shared environmental effects may play a part. Given the relatively small size of the present sample, the conclusions are to be seen as tentative. An augmented family study, incorporating middle aged twins and their young adult offspring, will clarify the causation of these developmental changes.

Type
Research Article
Copyright
Copyright © The International Society for Twin Studies 1986

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