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Sleep Apnea in Elderly Male Twins

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

To conduct a genetic analysis of anatomic risk factors for sleep apnea in a well-characterized United States population-based registry of elderly male twins who have been successfully followed for the past 30 years.

Lung Diseases
Sleep Apnea Syndromes

Study Type: Observational
Study Design: Observational Model: Defined Population

Resource links provided by NLM:

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

Study Start Date: August 1998
Estimated Study Completion Date: July 2002
Detailed Description:


The contribution of genetic factors to sleep disorders has been demonstrated in twin and family studies, and further understanding of the genetic underpinning of sleep disorders is considered an important area of research. Many of the suggested risk factors for sleep apnea (e.g.,craniofacial morphology, obesity) have genetic determinants. However, a formal genetic analysis of these anatomical risk factors with sleep-recorded physiological measurements has not so far been conducted.


The investigators recruited a subsample of pairs from the NAS-NRC World War II Twin Registry in which at least one of the twin brothers reported sleep apnea symptoms and a subsample of control pairs in which both twins reported no symptoms. They monitoring the subgroup of twin pairs with overnight sleep recording. They also collected anthropometric measurements of weight, height, neck circumference, and craniofacial morphology and blood samples for determination of zygosity and DNA extraction for future molecular studies.

The twin design is most powerful for estimating the genetic and/or environmental overlap between physiological measurements such as sleep-recorded disordered breathing, obesity, and craniofacial morphology. The investigators chose to focus on an elderly male twin sample for which a wealth of data relevant to this study had been previously collected. Twin pair concordance or discordance for monitored sleep-disordered breathing allowed the full characterization of genetic/familial and individual environmental factors associated with the expression and severity of this condition.


Genders Eligible for Study:   Male
Accepts Healthy Volunteers:   No

No eligibility criteria

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Please refer to this study by its identifier: NCT00005525

Sponsors and Collaborators
Investigator: Dorit Carmelli SRI International
  More Information

Publications: Identifier: NCT00005525     History of Changes
Other Study ID Numbers: 5053
Study First Received: May 25, 2000
Last Updated: June 23, 2005
Health Authority: United States: Federal Government

Additional relevant MeSH terms:
Lung Diseases
Sleep Apnea Syndromes
Nervous System Diseases
Respiration Disorders
Respiratory Tract Diseases
Signs and Symptoms
Signs and Symptoms, Respiratory
Sleep Disorders
Sleep Disorders, Intrinsic processed this record on November 25, 2014