Role of Microvascular Insulin Resistance and Cardiorespiratory Fitness Diabetes

Обзор

The goal of this two-site grant proposal is to determine the role of the decreased insulin-mediated muscle perfusion found in type 2 diabetes in contributing to the development of cardiac and skeletal muscle dysfunction and subsequent functional exercise impairment. In addition, it is also our goal to determine whether exercise training attenuates insulin resistance and restores insulin-mediated perfusion to the heart and to skeletal muscle, leading to improved cardiac function and exercise performance.

Подробное описание

It is our goal to determine whether exercise training attenuates insulin resistance and restores insulin-mediated perfusion to the heart and to skeletal muscle, leading to improved cardiac function and exercise performance. Data from our two research teams suggest that the cardiac and skeletal muscle microvascular dysfunction present in people with type 2 diabetes contributes to limitations in cardiac and skeletal muscle function associated with impaired functional exercise capacity (a major predictor of CV and all-cause mortality). Insulin action is a potent predictor of the functional exercise capacity impairment in type 2 diabetes. The exact relationship between insulin action, cardiac and muscle dysfunction, cardiac and skeletal muscle perfusion and decreased functional exercise capacity in type 2 diabetes remains unclear.

Вмешательства

• Поведенческое Cardiovascular exercise
  15 weeks of cardiovascular exercise 3x/week for 50 minutes/session

Первичные конечные точки

• Change in peak oxygen consumption (VO2) [Срок оценки: Through study completion, approximately 4 months]
• Change in insulin sensitivity [Срок оценки: Through study completion, approximately 4 months]

Критерии участия

Критерии включения

• Sedentary (defined as less than 1 hour per week of physical activity)
• BMI: 25-40
• Men and women with and without type 2 diabetes

Критерии исключения

• Documented cardiovascular disease
• Uncontrolled hypertension: disease systolic blood pressure (SBP) > 150, diastolic blood pressure (DBP)> 110
• Obstructive pulmonary disease or asthma
• Peripheral neuropathy
• Physical impairment that would limit exercise ability
• Subjects taking beta blockers, calcium channel blockers, insulin, or Thiazolidinediones (TZD)
• Current or past smoking within the last 1 years
• Current tobacco use
• Anemia
• Control HbA1c > 5.7, T2DM HbA1c > 9
• Pregnant, nursing or hormonal therapy (other than contraceptives)
• Peri or post-menopausal women
• Type 1 diabetes
• Hepatic or renal disease.

Критерии приведены из реестра в оригинале (на английском). Окончательную оценку соответствия проводит исследовательский центр.

Здоровые добровольцы: Да

Дизайн исследования

Распределение

Нерандомизированное

Модель

Параллельные группы

Маскирование

Открытое

Основная цель

Лечение

Центры проведения

США · 2 центра

• University of Colorado — Aurora
• University of Virginia — Charlottesville

Публикации

• Park S, Englund EK, Fujiwara T, Enge D, Schafer M, Gerstner Saucedo J, Clark EW, Abushamat LA, Scalzo RL, Fonseca B, Hunter KS, Sammel MD, Regensteiner JG, Reusch JEB, Barker AJ. Comprehensive CMR evaluation including 4D flow-derived E/A vorticity ratio in overweight adults with and without type 2 diabetes mellitus. Cardiovasc Diabetol. 2025 Dec 8;25(1):7. doi: 10.1186/s12933-025-02999-9. PMID 41361416

Идентификаторы

NCT: NCT04791371 · 20-2723 · R01DK124344

Первоисточники (государственные реестры)

• ClinicalTrials.gov (NIH, США)

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