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Sponsors and Collaborators: |
Seattle Institute for Biomedical and Clinical Research American Diabetes Association |
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Information provided by: | Seattle Institute for Biomedical and Clinical Research |
ClinicalTrials.gov Identifier: | NCT00220441 |
The specific aims for the study will be to determine if aerobic exercise enhances cognition for older adults who are at risk for developing type II diabetes mellitus (T2DM), and to evaluate whether change in insulin sensitivity predicts cognitive performance for subjects randomized to the aerobic exercise group. Sedentary older adults diagnosed with impaired glucose tolerance using an oral glucose tolerance test will participate in a 6-month supervised protocol of either aerobic exercise or stretching. Cognitive testing and blood collection will occur at baseline, and months 3 and 6. Before and after the 6-month intervention, insulin sensitivity, maximum aerobic capacity, and body fat composition and distribution (via CT scan) will be assessed for all subjects. The results of this study may provide support for a relatively simple and inexpensive treatment strategy that specifically targets many of the health factors that directly influence risk of cognitive decline associated with T2DM for older adults.
Condition | Intervention | Phase |
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Impaired Glucose Tolerance |
Behavioral: Aerobic exercise |
Phase II |
Study Type: | Interventional |
Study Design: | Treatment, Randomized, Single Blind, Active Control, Parallel Assignment, Efficacy Study |
Official Title: | Cognitive Effects of Aerobic Exercise for Adults With Impaired Glucose Tolerance: A Controlled Trial |
Estimated Enrollment: | 40 |
Study Start Date: | July 2004 |
Study Completion Date: | April 2008 |
Primary Completion Date: | December 2007 (Final data collection date for primary outcome measure) |
The benefits of exercise on cognition have been demonstrated both in animals and humans. Exercise has salutary effects on glucoregulation and visceral adiposity, an important link for adults with impaired glucose tolerance (IGT) and type 2 diabetes mellitus (T2DM). Exercise also upregulates neurotrophic activity, an effect that serves to increase neuronal viability in the same brain regions that support complex cognitive functions affected by metabolic disease. In this proposed controlled intervention trial, the hypothesis is that aerobic exercise will have a beneficial effect on cognition and several biomarkers that index disease progression for older adults with IGT. 40 older subjects (age: >55 yrs) with IGT, confirmed by OGTT, will be randomized to an aerobic fitness or stretching program for 6 months. Cognitive measures and fasting blood samples will be obtained at baseline, month 3, and month 6. Cognitive tests will evaluate abilities affected by age and by significant glucoregulatory dysregulation. In addition, all subjects will undergo a hyperinsulinemic-euglycemic clamp protocol, a cardiopulmonary fitness assessment, and body fat quantification procedures, immediately before and after the intervention. The specific aims of the study will be to determine if aerobic exercise enhances cognition for older adults with IGT, to evaluate whether exercise-induced change in insulin sensitivity predicts cognitive performance, and to relate exercise effects on insulin sensitivity and cognition to changes in specified biomarkers. The results of this study may provide support for a relatively simple and inexpensive treatment strategy that targets many of the health factors that influence risk of cognitive decline.
Ages Eligible for Study: | 55 Years to 90 Years |
Genders Eligible for Study: | Both |
Accepts Healthy Volunteers: | Yes |
Inclusion Criteria:
Exclusion Criteria:
United States, Washington | |
Veterans Affairs Puget Sound Health Care System | |
Tacoma, Washington, United States, 98493 | |
Veterans Affairs Puget Sound Health Care System | |
Seattle, Washington, United States, 98108 |
Principal Investigator: | Laura D. Baker, PhD | VA Puget Sound Health Care System; University of Washington |
Study ID Numbers: | RDIS 0009, ADA BL19 (SIBCR) |
Study First Received: | September 21, 2005 |
Last Updated: | July 29, 2008 |
ClinicalTrials.gov Identifier: | NCT00220441 History of Changes |
Health Authority: | United States: Food and Drug Administration |
IGT exercise cognition |
insulin aging aerobic |
Metabolic Diseases Hyperglycemia Glucose Intolerance |
Glucose Metabolism Disorders Metabolic Disorder Insulin |
Metabolic Diseases Hyperglycemia Glucose Intolerance Glucose Metabolism Disorders |