Exercise Dose Response for Improving Insulin Sensitivity

Study Overview
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Brief Summary
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Many of the beneficial metabolic effects of endurance exercise training are not due to adaptations to weeks, months, or even years of training, but rather much is due to the response to the most recent exercise session(s). Therefore, the investigators contend that lifestyle interventions for obese individuals should be tailored to optimize the metabolic effects of the most recent exercise session(s). But the dose of exercise necessary to evoke these beneficial responses is not known, and the mechanisms responsible for these improvements are poorly understood. The findings from these studies will: 1) establish the minimum dose of a single exercise session necessary to improve insulin sensitivity the next day in obese adults, 2) characterize the underlying metabolic factors responsible for the improvement in insulin sensitivity, and 3) assess the cumulative metabolic adaptations that occur over days, weeks, and months of a low-intensity/low-volume lifestyle exercise program. Findings from these studies will provide valuable information for the development of lifestyle programs aimed at maximizing the key metabolic health benefits of each exercise session in obese patients.

Official Title
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Comparing the Effects Exercise Intensity and Energy Expended During a Single Exercise Session on Insulin Sensitivity and Fatty Acid Partitioning Within Skeletal Muscle the Next Day in Obese Adults.

Conditions
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Obesity

Intervention / Treatment
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* Other: Exercise


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Body Mass Index [BMI] = 30-45 kg/m2, weight stable (± 5 lbs in the past month), fasting blood glucose concentration must be <125 mg/dl. Exclusion Criteria: pregnancy, evidence of cardiovascular or metabolic disease, taking medications know to influence metabolism.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 45 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Allocation: Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Exercise<br> | Other: Exercise<br>* single session of exercise<br>|
| No Intervention: Sedentary Control<br> | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Insulin Sensitivity | A hyperinsulinemic-euglycemic clamp will be used to assess peripheral insulin sensitivity and will be performed using a primed 2h insulin infusion at a rate of 100 mU/m2/min. | 2-3 hours | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Resting Metabolic Rate |  | 40-60 min | 
| Meal Tolerance Test |  | 2-3h | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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insulin sensitivity, fatty acid metabolism, exercise