Aging and Cellular Mechanism for Insulin Action After Exercise Training

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. Identifier: NCT00018239
Recruitment Status : Completed
First Posted : July 5, 2001
Last Update Posted : January 21, 2009
Information provided by:
VA Office of Research and Development

Brief Summary:
This study will determine whether the metabolic and cellular mechanisms contributing to improved insulin action after aerobic or resistive exercise are different in older, obese, insulin resistant veterans. The hypothesis is that regular exercise, whether aerobic or resistive, will improve whole body insulin action, but the nature and magnitude of changes in skeletal muscle will differ between the two types of exercise.

Condition or disease Intervention/treatment Phase
Diabetes Mellitus Procedure: Exercise Not Applicable

Detailed Description:
Veterans will be of comparable body composition and age, and randomly assigned to either aerobic or resistive exercise. They will be instructed in a weight maintenance diet prior to beginning the exercise program, and maintain this diet throughout the study. Metabolic testing will be performed at baseline and after 6 months of exercise training. Testing will include measurement of body composition (anthropometry, dual-energy Xray absorptiometry, computed tomograph scan), maximal oxygen consumption, and muscle strength, glucose tolerance (oral glucose tolerance test), insulin sensitivity (euglycemic-hyperinsulinemic clamp), and muscle biopsies to examine skeletal muscle metabolic characteristics (fiber type distribution, capillary density, oxidative and glycolytic enzyme activities, and levels of key proteins important in insulin signaling and glucose transport). Data will be analyzed using analysis of variance to determine differences between the two exercise groups, and multiple regression analysis to determine the primary adaptations that are associated with the improvements in whole body insulin action.

Study Type : Interventional  (Clinical Trial)
Allocation: Randomized
Intervention Model: Single Group Assignment
Primary Purpose: Treatment
Official Title: Aging and Cellular Mechanism for Insulin Action After Exercise Training
Study Start Date : October 1999
Study Completion Date : September 2002

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Ages Eligible for Study:   50 Years to 80 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Males between 50 years and 80 years



Sedentary (no regular exercise for one year)

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To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00018239

United States, Maryland
VA Maryland Health Care System
Baltimore, Maryland, United States, 21201
Sponsors and Collaborators
VA Office of Research and Development
OverallOfficial: Andrew P Goldberg, M.D. Identifier: NCT00018239     History of Changes
Other Study ID Numbers: AGCG-001-99S
First Posted: July 5, 2001    Key Record Dates
Last Update Posted: January 21, 2009
Last Verified: December 2004

Additional relevant MeSH terms:
Diabetes Mellitus
Glucose Metabolism Disorders
Metabolic Diseases
Endocrine System Diseases