Blood Flow Responses to an Oral Glucose Tolerance Test in Type 2 Diabetes

2014-08-27 03:19:31 | BioPortfolio


The investigators wish to determine whether a short period of exercise training (5-10 days) improves the metabolic and cardiovascular response of people with or at risk of developing type 2 diabetes to eating a meal. In healthy people, blood flow to skeletal muscles increases after eating a meal, and this helps to regulate blood sugar levels by delivering blood sugar to muscles where it can be stored or metabolized. In people with or at risk of type 2 diabetes, blood flow does not increase as much after eating a meal, and this may contribute to elevated blood sugar concentrations observed in these individuals. The investigators wish to determine whether exercise can improve this response.


Insulin resistance is characterized by decreased sensitivity to the metabolic actions of insulin (glucose disposal) and is a hallmark of obesity and type 2 diabetes (T2D). Insulin resistance is also a prominent component of cardiovascular diseases (CVD), including hypertension, coronary artery disease, and atherosclerosis, which are characterized by endothelial dysfunction. Insulin stimulates two distinct signaling pathways in the endothelium. One produces the vasodilator nitric oxide (NO) through the insulin receptor substrate-1(IRS-1)/endothelial NO synthase (eNOS) pathway while the other stimulates production of endothelin-1 (ET-1), a vasoconstrictor, through the mitogen activated protein kinase (MAPK) pathway. Insulin-mediated glucose disposal is largely dependent upon the vasodilatory effects of insulin; however, in T2D, insulin-stimulated dilation is impaired as a result of an imbalance in NO and ET-1 production, leading to diminished microvascular perfusion and skeletal muscle glucose delivery in response to insulin. The effects of exercise on insulin signaling/action in the endothelium are not fully understood. The purpose of this study is determine the acute effects of aerobic exercise training on cardiometabolic responses to meal ingestion in individuals with insulin resistance or T2D. We will recruit 30 previously sedentary (<60 minutes of planned exercise/week) men and women with insulin resistance (pre-diabetes) or T2D for participation in this study. Participants will undergo a screening procedure, including telephone screening and physical examination, as well as determination of body composition and fitness. Participants will be asked to complete 5-10 days of supervised exercise training and will undergo testing to assess cardiovascular and metabolic responses to an oral glucose tolerance test, including muscle sympathetic nerve activity, blood flow, and circulating glucose and insulin concentrations at baseline and following training. In addition, participants will use continuous glucose monitoring systems for 3 days at baseline and during 3 days of exercise training to assess the effects of acute exercise on postprandial glucose responses to mixed meals in free-living individuals. The overall aim of the project is to determine whether or not acute exercise training influences postprandial metabolic, vascular or autonomic nervous system responses in individuals with insulin resistance or T2D.

Study Design

Allocation: Randomized, Control: Uncontrolled, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Prevention


Type 2 Diabetes




University of Missouri
United States




University of Missouri-Columbia

Results (where available)

View Results


Published on BioPortfolio: 2014-08-27T03:19:31-0400

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Medical and Biotech [MESH] Definitions

The time period before the development of symptomatic diabetes. For example, certain risk factors can be observed in subjects who subsequently develop INSULIN RESISTANCE as in type 2 diabetes (DIABETES MELLITUS, TYPE 2).

A subclass of DIABETES MELLITUS that is not INSULIN-responsive or dependent (NIDDM). It is characterized initially by INSULIN RESISTANCE and HYPERINSULINEMIA; and eventually by GLUCOSE INTOLERANCE; HYPERGLYCEMIA; and overt diabetes. Type II diabetes mellitus is no longer considered a disease exclusively found in adults. Patients seldom develop KETOSIS but often exhibit OBESITY.

The exercise capacity of an individual as measured by endurance (maximal exercise duration and/or maximal attained work load) during an EXERCISE TEST.

Controlled physical activity, more strenuous than at rest, which is performed in order to allow assessment of physiological functions, particularly cardiovascular and pulmonary, but also aerobic capacity. Maximal (most intense) exercise is usually required but submaximal exercise is also used. The intensity of exercise is often graded, using criteria such as rate of work done, oxygen consumption, and heart rate.

A type of strength-building exercise program that requires the body muscle to exert a force against some form of resistance, such as weight, stretch bands, water, or immovable objects. Resistance exercise is a combination of static and dynamic contractions involving shortening and lengthening of skeletal muscles.

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