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Weight Set-Point and HDL Concentration in Runners

This study has been completed.
Sponsor:
ClinicalTrials.gov Identifier:
NCT00005342
First Posted: May 26, 2000
Last Update Posted: February 29, 2016
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI)
  Purpose
To investigate the differences in diet, fat cell morphology and lipoprotein metabolism in previously- overweight and naturally lean men and women who ran and who lived sedentary lifestyles in order to better understand the relationship between lipoprotein metabolism and weight set-point.

Condition
Cardiovascular Diseases Heart Diseases Obesity

Study Type: Observational

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

Study Start Date: May 1993
Study Completion Date: April 1997
Detailed Description:

BACKGROUND:

The elevated high-density lipoprotein (HDL) cholesterol concentrations of long distance runners has been ascribed almost exclusively to increased muscle lipoprotein lipase. Based on data collected in cross-sectional and longitudinal studies, the investigators proposed an alternative theory: long-distance runners had the HDL-cholesterol metabolism of men who were below their sedentary weight rather than the HDL-cholesterol metabolism of lean sedentary men who were at their usual sedentary weight. In other analyses, they found that the most significant determinant of male runners' plasma HDL-cholesterol concentrations was the difference between the runners' greatest weight and their current weight. HDL- cholesterol levels were highest in runners who had lost the most weight, i.e., highest in those who were presumed to be the furthest below their weight set-point

The study was a result of a Program Announcement (PA) released in October, 1994 on Physical Activity and Cardiopulmonary Health. The PA was jointly sponsored by the NHLBI, the National Institute of Diabetes and Digestive and Kidney Diseases, and the National Institute of Nursing Research.

DESIGN NARRATIVE:

In this cross-sectional study, runners and sedentary men and women were measured for lipoprotein cholesterol, triglycerides, polyacrylamide gel electrophoresis of HDL and low-density lipoprotein subclasses, apolipoproteins A-I and B, intravenous fat clearance rate, post-heparin lipoprotein lipase and hepatic lipase, adipose tissue lipoprotein lipase, cholesteryl ester transfer activity, diet, percent body fat, and regional adiposity. It was hoped that the survey would confirm or reject the weight set-point hypothesis, provide a possible explanation of the lipoprotein differences between male and female runners, and elucidate the mechanism for the lipoprotein changes that occur during exercise-induced weight loss.

The study completion date listed in this record was obtained from the "End Date" entered in the Protocol Registration and Results System (PRS) record.

  Eligibility

Information from the National Library of Medicine

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Ages Eligible for Study:   up to 100 Years   (Child, Adult, Senior)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   No
Criteria
No eligibility criteria
  Contacts and Locations
No Contacts or Locations Provided