Longitudinal Twin Study - Cohort Study of Blood Pressure

This study has been completed.
Sponsor:
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI)
ClinicalTrials.gov Identifier:
NCT00005161
First received: May 25, 2000
Last updated: June 23, 2005
Last verified: June 2000
  Purpose

To analyze the genetic and environmental contributions of juvenile hemodynamic determinants of blood pressure, including cardiac output and systemic vascular pressure, to adult cardiovascular risk.


Condition
Cardiovascular Diseases
Heart Diseases
Hypertension

Study Type: Observational

Resource links provided by NLM:


Further study details as provided by National Heart, Lung, and Blood Institute (NHLBI):

Study Start Date: August 1983
Estimated Study Completion Date: July 1993
Detailed Description:

BACKGROUND:

Identifying individuals at a young age who are at risk for future development of hypertension in adult life is a public health issue of great importance. The imperfect nature of blood pressure tracking throughout childhood and adolescence, and the fact that the genes which determine blood pressure in childhood may not be the same ones which operate in adulthood make it clear that improved predicting models are needed. The twin-parent study design allowed testing more subtle genetic and environmental hypotheses than was possible with nuclear families or twins alone. The longitudinal component permitted an analysis of developmental changes in the genetic expression of the hemodynamic determinants of blood pressure. The inclusion of unlike sex twins permitted an analysis of the consistency of genetic and environmental effects across the sexes.

DESIGN NARRATIVE:

The longitudinal comparison of the cardiovascular responses of adolescent twins and their parents was initialed in 1983. Three cohorts of twin families were enrolled, each cohort beginning 18 months apart. Both monozygotic and dizygotic twins were included. Variables measured included demographics, family history, personality, blood pressure, anthropometry, stage of puberty, dynamic exercise, isometric exercise, psychological stress, echocardiography, genotyping, and lipid profiles. Each cohort revisited every 18 months.

A fourth cohort of 330 preadolescent twin pairs stratified by sex and zygosity was recruited from an established population-based twin registry. The hemodynamic determinants of blood pressure were assessed by non-invasive measurements of cardiac function including echocardiography and response to isometric and dynamic exercise. Zygosity was determined by questionnaire and confirmed by dermatoglyphic analysis and blood group tests. Anthropometric and hemodynamic measurements in the parents were compared to those in the children. The study included up to five sets of longitudinal measurements, thereby permitting an evaluation of whether the same or different genes operated at different ages encompassing pre-puberty, puberty, and post-puberty.

  Eligibility

Genders Eligible for Study:   Male
Accepts Healthy Volunteers:   No
Criteria

No eligibility criteria

  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

No Contacts or Locations Provided
  More Information

Publications:
Schieken RM: Exercise Study of Blood Pressure: A Predictor of Future Hypertension? In: NHLBI Workshop on Juvenile Hypertension, Loggie JHM, Horan M, Gruskin AB, et al (Eds.), Biomedical Information Corporation, NY, NY, 1984
Schieken RM: Children's Blood Pressure. Report of 8th Ross Conference on Pediatric Research, Columbus Ohio: Ross Laboratories, 1985
Eaves LJ, Hewitt JK, Heath AC: The Quantitative Study of Human Developmental Change: A Model and its Limitations. 2nd International Conference on Quantitative Genetics, Sinauer Associates, 1988

ClinicalTrials.gov Identifier: NCT00005161     History of Changes
Other Study ID Numbers: 1033
Study First Received: May 25, 2000
Last Updated: June 23, 2005
Health Authority: United States: Federal Government

Additional relevant MeSH terms:
Cardiovascular Diseases
Heart Diseases
Hypertension
Vascular Diseases

ClinicalTrials.gov processed this record on October 23, 2014