Effects of Six Months of Moderate Resistance- Versus Endurance-Training on Muscle ATP Synthesis in First-Degree Relatives of Patients With Type 2 Diabetes (RECO2)

Effects of Six Months of Moderate Resistance- Versus Endurance-Training on Muscle ATP Synthesis in First-Degree Relatives of Patients With Type 2 Diabetes

Effects of Six Months of Moderate Resistance- Versus Endurance-Training on Muscle ATP Synthesis in First-Degree Relatives of Patients With Type 2 Diabetes

Mein Hanusch-Krankenhaus, Karl-Landsteiner Institute for Endocrinology and Metabolism, Medical University of Vienna, Lund University, Fondazione C.N.R./Regione Toscana "G. Monasterio", Pisa, Italy

Life style intervention including diet and exercise is the recommended strategy for prevention of type 2 diabetes mellitus (T2DM). First-degree relatives of patients with type 2 diabetes mellitus have an increased risk of insulin resistance and a lifetime risk of developing type 2 diabetes of 40%- 80%. Poor physical fitness is a strong indicator of an increased risk of developing diabetes. Long-term endurance exercise training has been shown to increase insulin sensitivity in sedentary young and elderly individuals, first degree relatives of patients with Type 2 diabetes, glucose intolerant obese, or Type 2 diabetic humans. In type 2 diabetic patients, non-diabetic individuals with IGT and sedentary adults after exercise training of different intensity, different duration and different frequency an increase of insulin sensitivity was found. However, despite the vast knowledge concerning beneficial effects physical activity for the prevention of T2DM (and many other chronic metabolic disorders) to date wide ranging strategies have not been realized satisfactory. Regardless of age, ethnicity, sex or health status the lack of time is the primary reason for the failure to exercise on a regular basis (or is stated as primary reason). Therefore the investigators aimed at investigating whether a controlled endurance/resistance training twice a week over 6 month might be beneficial for healthy, non obese, first degree relatives with T2DM. Therefore the investigators measure parameters associated with the prevention of T2DM like insulin sensitivity, flux through fATPase and fCK, intramyocellular and hepatocellular lipids.

type 2 diabetes, exercise training, ATP-synthesis, intramyocellular lipids, hepatocellular lipids, first degree relatives of T2DM patients

The endurance training group exercised on a cycle ergometer (90% of power output determined at the respiratory compensation point = RCP). The duration of each training unit was increased with time. The resistance group trained on 8 weight machines where the workload gradually increased every 2-3 weeks. At week 13 an additional physical examination, OGTT and spiro-ergometry for adjusting the training were performed.

incremental test power, oxygen uptake (VO2 in ml.kg-1.min-1), "aerobic threshold" (RCP= respiratory compensation point)

Inclusion Criteria: First degree relatives of type 2 diabetic patients Age: 18-50 years BMI <30 kg/m2 (due to limited MR diameter) Normal routine lab tests (blood cell count, kidney, liver, pancreas, thyroid and neuromuscular function) Availability within the local area throughout the study Ability to understand and sign the consent forms Exclusion Criteria: Current smoking Present drug treatment Regular exercise training Contraindications for MRS studies: claustrophobia and metalliferous implants Pregnancy HIV or Hepatitis Acute disease 2 weeks previous to the examination Heart disease Hypertension (RR>140/95) Liver disease Kidney disease Pulmonary disease Thyroid disease

Institute for Clinical Diabetology, German Diabetes Center (Leibniz Center for Diabetes Research), Department of Metabolic Diseases, Heinrich-Heine University and University Clinics Düsseldorf, Germany