N/A
N=90
Exercise Training and Glucose Metabolism in Aging
Type 2 Diabetes Mellitus · Impaired Glucose Tolerance (Prediabetes)
Bottom Line
View on ClinicalTrials.gov: NCT00701051 ↗Enrolled (actual)
90
Serious AEs
0.0%
Results posted
Apr 2015
Primary outcome: Primary: Baseline Glucose Utilization — 0.0062; 0.0035 µmol/kgFFM/pmol insulin/min
Study Design & Population
- Study type
- Interventional
- Phase
- N/A
- Interventions
- Aerobic exercise training (Behavioral); Detraining (cessation of exercise) (Behavioral)
- Age
- Adult, Older Adult · 50+ yrs
- Sex
- All
- Sponsor
- US Department of Veterans Affairs
- Primary completion
- Jun 2012
Outcome Measures
| Outcome | Result | p-value |
|---|---|---|
| PRIMARY Baseline Glucose Utilization |
0.0062; 0.0035 | — |
| PRIMARY Glucose Utilization (Pre/Post Intervention) |
0.041; 0.052; 0.048 | — |
| PRIMARY Baseline Skeletal Muscle Capillarization |
313; 246 | — |
| PRIMARY Skeletal Muscle Capillarization (Pre/Post Intervention) |
289; 341; 361 | — |
| SECONDARY Baseline 2-hour Postprandial Glucose |
107; 160 | — |
| SECONDARY 2-hr Post-prandial Plasma Glucose Level |
173; 153; 142 | — |
| SECONDARY Baseline Cardiorespiratory Fitness |
2.2; 1.7 | — |
| SECONDARY Cardiorespiratory Fitness |
1.8; 2.3; 2.2 | — |
| SECONDARY Body Composition (%Fat) |
35; 33 | — |
Summary
Diabetes and its associated complications affect more than 20 million Americans, and the prevalence of type 2 diabetes and impaired glucose tolerance rises dramatically with age such that 40% of Americans over age 60 are affected. In older adults, glucose metabolism may be affected by reduced skeletal muscle capillary supply, which limits insulin, glucose, and oxygen delivery to skeletal muscle. Reduced capillary supply to skeletal muscle is found in older individuals with impaired glucose tolerance and we hypothesize that this is due to reduced vascular growth factor expression, and chronic inflammation. Further, we hypothesize that reversal of a sedentary lifestyle through aerobic exercise training will increase insulin signaling and vascular growth factor expression, as well as decrease inflammation, to increase capillary supply to skeletal muscle, which contributes to improved glucose metabolism in older adults. This study will: 1) Determine the mechanisms underlying reduced skeletal muscle capillarization in older adults with impaired glucose tolerance; and 2) Determine the effect of aerobic exercise training-induced increases in skeletal muscle capillarization on glucose metabolism in older adults.
Eligibility Criteria
Inclusion Criteria
- Age 50-75 years
- Non-smoker >2 years
- Body mass index = 18-35 kg/m2
Exclusion Criteria
- History of CAD or cerebrovascular disease that would preclude exercise
- Implantable defibrillator
- Active cancer
- Chronic pulmonary, thyroid, renal, liver, or hematological disease
- HIV positive or prone to malnutrition
- Sickle cell anemia
- Type 1 diabetes, or currently on medication to treat type 2 diabetes
- Poorly-controlled type 2 diabetes
- Poorly-controlled hypertension
- Taking medications including: beta-blockers, oral steroids, warfarin, certain statins, hormone replacement therapy (HRT), oral contraceptives (OCP), thiazolidinediones (TZD), or chronic steroids or nonsteroidal analgesics (NSAIDS) that may not be safely discontinued temporarily for specific procedures (i.e. for 72 hours prior)
- Allergic to lidocaine or heparin
- Recent weight change (>5kg in 3 months)
- Currently pregnant or nursing
- Physical impairment limiting exercise
- Dementia or unstable clinical depression
Data sourced from ClinicalTrials.gov (NCT00701051). Outcome figures and adverse-event rates are extracted automatically from the registry's posted results and are provided for clinician reference, not as a substitute for the primary publication.