Muscle Lipid and Insulin Resistance in the Elderly (MIRA)
Recruitment status was Recruiting
This project will provide novel information concerning the ability of exercise to enhance the capacity for oxidative metabolism of fatty acids and improve insulin resistance in older adults who are at high risk for the development of type 2 diabetes. Ultimately this may help identify mechanisms and therapeutic targets implicated in skeletal muscle metabolic dysregulation. The proposed study is to conduct a randomized controlled exercise training intervention trial in older men and women. In addition, the response to exercise in these subjects will be compared to those of highly endurance-trained, age-matched athletes.
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Treatment
|Official Title:||Muscle Lipid and Insulin Resistance in the Elderly|
- Insulin sensitivity and muscle fat content will be measured at the beginning and the end of the intervention to determine the effects of exercise on these measures. [ Time Frame: 16 weeks ] [ Designated as safety issue: No ]
- Examine if exercise-induced improvements in insulin sensitivity are similar in normal weight and in obese older subjects. [ Time Frame: 16 weeks ] [ Designated as safety issue: No ]
|Study Start Date:||July 2004|
|Estimated Study Completion Date:||December 2009|
|Estimated Primary Completion Date:||October 2009 (Final data collection date for primary outcome measure)|
Behavioral: Exercise Group
Sixteen week intervention where subjects will be progressed to four days per week for 45 minutes per session, 180 minutes minimum per week, of moderate intensity supervised exercise.
|Experimental: Health Education Group||
Behavioral: Health Education Group
Sixteen week intervention. This group will not receive specific exercise education or prescription but will be asked to participate in biweekly health education sessions
Hypothesis and Specific Aims:
To determine whether aerobic exercise improves both skeletal muscle fat distribution and insulin sensitivity of older men and women. We will test two hypotheses.
i. Physical exercise in older adults will decrease the amount of fat interspersed within muscle, specifically the fat between muscle groups (intermuscular adipose tissue) as well as decrease specific lipid metabolites within muscle cells, compared to controls.
ii. Exercise-induced improvements in insulin sensitivity of older men and women will be related to the changes in muscle fat content independent of changes in total body fat or visceral abdominal adipose tissue.
To determine whether increased capacity for oxidative fatty acid metabolism within muscle results in improved insulin sensitivity in older adults. We will test two hypotheses.
i. Exercise training will increase the capacity of muscle to oxidize fatty acids assessed both in vitro and in vivo.
ii. Improved capacity for oxidative fatty acid metabolism will predict improvements in insulin sensitivity.
|Contact: Jennifer Gabany, CRNP-C, CCRCfirstname.lastname@example.org|
|United States, Pennsylvania|
|University of Pittsburgh||Recruiting|
|Pittsburgh, Pennsylvania, United States, 15213|
|Principal Investigator:||Bret H. Goodpaster, PhD||University of Pittsburgh|