Orthogonal Polarisation Study in Young, Elderly and Type 2 Diabetics

Study Overview
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Brief Summary
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Aging is accompanied by a progressive loss of skeletal muscle mass and strength, leading to the loss of functional capacity and an increased risk of developing chronic metabolic disease. One of these metabolic diseases interacting with muscle mass is Diabetes Mellitus type 2. Diabetes Mellitus type 2 is characterized by high blood glucose in the context of insulin resistance and relative insulin deficiency. It has become clear that amongst its many actions, insulin is also a vasoactive hormone. Its effect to cause endothelial-nitric oxide dependent vasodilation is physiologic and dose dependent. Recent data suggest that insulin's metabolic and vascular actions are closely linked. This also means that an increase in microvascular perfusion following food intake is more resistant to postprandial insulin release. This physiological process is brought into prominence with increasing age, and even more in type 2 diabetics, and contributes to diminishing glycaemic control. In the present study the investigators will investigate the impact of postprandial insulin release on microvascular recruitment in the oral cavity.

Detailed Description
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To fulfil the increasing demand for real-time evaluation of micro vascular flow in muscle tissue, new techniques have been evaluated. The conventional systemic hemodynamic and oxygenation parameters are neither specific nor sensitive enough to detect regional perfusion. A more complete evaluation of tissue oxygenation can be achieved by adding noninvasive assessment of perfusion in peripheral tissues to global parameters. Noninvasive monitoring of peripheral perfusion could be a complementary approach that allows very early application throughout the hospital and interventional research. Orthogonal polarization spectral (OPS) is a non invasive technique that uses reflected light to produce real-time images of the microcirculation. The technology has been incorporated into a small hand-held videomicroscope which can be used in both research and clinical settings. OPS can assess tissue perfusion using the functional capillary density (FCD), i.e., the length of perfused capillaries per observation area (measured as cm/cm2). FCD is a very sensitive parameter for determining the status of nutritive perfusion to the tissue. So far, one of the most easily accessible sites in humans for peripheral perfusion monitoring is the mouth. OPS produces excellent images of the sublingual microcirculation by placing the probe under the tongue. Movement artifacts, semiquantitative measure of perfusion, the presence of various secretions such as saliva and blood, observer-related bias, and malfunction of the apparatus are some of the limitations of the technique. In the present study we will investigate the impact of postprandial insulin release on microvascular recruitment in the oral cavity.

Official Title
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Postprandial Insulin Release and the Impact on Muscle Perfusion

Conditions
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Type 2 Diabetes Mellitus

Intervention / Treatment
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* Dietary Supplement: Glucose
* Dietary Supplement: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Male Aged between 20-30 or 65-80 years BMI < 30 kg/m2 Non insulin-dependent Diabetes mellitus type 2 patients. Use of oral anti-diabetic agents (TZD's, Metformin and/or a sulfonylurea derivative) is allowed. Exclusion Criteria: Positive history for hypertension Smoking Hypertension (according to WHO criteria)18 Use of medication, except for oral blood glucose lowering medication All co morbidities interacting with mobility and muscle metabolism of the lower limbs (e.g. arthrosis, arthritis, spasticity/rigidity, all neurological disorders and paralysis). HbA1c > 10.0% Diagnosed impaired renal or liver function Obesity (BMI>30 kg/m2) Cardiac disease or cardiovascular problems in history Overt diabetic complications

Ages Eligible for Study
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Minimum Age: 20 Years

Sexes Eligible for Study
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Male

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: Crossover Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Glucose drink<br>75 gram glucose, dissolved in 250 ml water | Dietary Supplement: Glucose<br>* Glucose drink: 75 gram dextrose monohydrate, dissolved in 250 ml water<br>* Other names: GLU;|
| Placebo Comparator: Placebo<br>250 ml water | Dietary Supplement: Placebo<br>* 250 ml water<br>* Other names: PLA;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Glycocalyx permeability | Changes in glycocalyx permeability in young, elderly and type 2 diabetics after ingestion of a glucose or water (placebo) drink. The glycocalyx will be measured during 2 h after ingestion of the drink. | 30 minutes after ingestion of the drink | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Microvascular density | Determination of microvascular density in muscle tissue in young, elderly and type 2 diabetic patients. | 3 h after ingestion of glucose drink | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Glucose, insulin, Glycocalyx, Muscle, Vascularisation, young, elderly