Dynamic in Vivo PET Imaging and ex Vivo Biopsies From Skeletal Muscle and Adipose Tissue to Investigate the Effects of Exercise on Insulin Resistance and Mitochondrial Energetics in Type 2 Diabetes

Inclusion Criteria: 1. Age 30-65 years 2. Men and women 3. Body mass index (BMI) between 25 and 45 kg/m2 4. Sedentary (1 day or less per week of structured exercise) 5. Type 2 diabetes mellitus determined by self-report or by a fasting glucose \>126mg/dl 6. Weight stable (± 2 kg) for prior 3 months 7. Willing to commit to the schedule of assessment visits, including the exercise intervention Exclusion Criteria: 1. Currently taking insulin, injectable incretin mimetics and thiazolidinediones 2. Taking more than two glucose-lowering medications 3. Resting blood pressure ≥ 160/100 mm Hg 4. Triglycerides ≥ 500 mg/dL 5. Any renal, cardiac, liver, lung, or neurological disease that in the opinion of the principal investigator would compromise participant safety or the participants' ability to complete the exercise training protocol 6. Any significant disease or unstable medical condition (i.e., coronary heart disease, chronic renal failure, chronic hepatic disease, severe pulmonary disease) 7. Presence of clinically significant abnormalities on electrocardiogram (ECG) that is a contra-indication to exercise training 8. Pulse check ("Allen test") indicates participant has poor blood flow in the hands 9. Cancer (active malignancy with or without concurrent chemotherapy; except for basal cell carcinoma) 10. Pregnancy during the previous 6 months, lactating, or planned pregnancy in the next year 11. Use of drugs known to affect energy metabolism or body weight: including, but not limited to orlistat, sibutramine, ephedrine, phenylpropanolamine, corticosterone, etc 12. Current treatment with blood thinners or anti-platelet medications that cannot be safely stopped for testing procedures 13. Participant is currently taking anti-inflammatory medication or has had inflammatory medication within 1 week prior to screening (including over the counter formulations: e.g. Aleve, Motrin, Ibuprofen, Naproxen, low dose ASA. 14. New onset (\<3 months on a stable regime) hormone replacement therapy 15. Current use of beta-adrenergic blocking agents 16. Major surgery on the abdomen, pelvis, or lower extremities within previous 3 months 17. Increased liver function tests (AST/ALT/GGT/or alkaline phosphatase greater than 2.5 times the upper limit of normal) 18. Abnormal blood count/anemia, blood transfusion or blood donation within the last 2 months 19. Current smokers (smoking within the past 3 months prior to screening visit, including any/all tobacco products) 20. Current drug or alcohol abuse/dependence 21. Metal implants (pace-maker, aneurysm clips) based on investigator's judgment at screening 22. Not physically capable of performing the exercise required of the study protocols 23. Plans to be away \>2 weeks in the next 3 months 24. Unable to participate in Magnetic Resonance Imaging (MRI) assessments due to physical limitations of equipment tolerances (e.g. MRI bore size) based on investigator's judgment at screening. 25. Unable to tolerate MRI or claustrophobia. 26. Nickel allergy 27. Lidocaine allergy 28. Unable or unwilling to communicate with staff or to provide written informed consent