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Orthogonal Polarisation Study in Young, Elderly and Type 2 Diabetics

This study has been completed.
ClinicalTrials.gov Identifier:
First Posted: November 22, 2011
Last Update Posted: April 11, 2014
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by (Responsible Party):
Maastricht University Medical Center
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.

Condition Intervention
Type 2 Diabetes Mellitus Dietary Supplement: Glucose Dietary Supplement: Placebo

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double (Participant, Investigator)
Primary Purpose: Basic Science
Official Title: Postprandial Insulin Release and the Impact on Muscle Perfusion

Resource links provided by NLM:

Further study details as provided by Maastricht University Medical Center:

Primary Outcome Measures:
  • Glycocalyx permeability [ Time Frame: 30 minutes after ingestion of the drink ]
    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.

Secondary Outcome Measures:
  • Microvascular density [ Time Frame: 3 h after ingestion of glucose drink ]
    Determination of microvascular density in muscle tissue in young, elderly and type 2 diabetic patients.

Enrollment: 45
Study Start Date: October 2010
Study Completion Date: March 2014
Primary Completion Date: January 2014 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Glucose drink
75 gram glucose, dissolved in 250 ml water
Dietary Supplement: Glucose
Glucose drink: 75 gram dextrose monohydrate, dissolved in 250 ml water
Other Name: GLU
Placebo Comparator: Placebo
250 ml water
Dietary Supplement: Placebo
250 ml water
Other Name: PLA

Detailed Description:

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.


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Ages Eligible for Study:   20 Years and older   (Adult, Senior)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   Yes

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
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01476384

Maastricht University Medical Center+
Maastricht, Limburg, Netherlands, 6229ER
Sponsors and Collaborators
Maastricht University Medical Center
Principal Investigator: LJC van Loon, Professor Maastricht University
  More Information

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: Maastricht University Medical Center
ClinicalTrials.gov Identifier: NCT01476384     History of Changes
Other Study ID Numbers: MEC 10-3-050
MET 10-3-050 ( Registry Identifier: MET 10-3-050 )
First Submitted: November 14, 2011
First Posted: November 22, 2011
Last Update Posted: April 11, 2014
Last Verified: April 2014

Keywords provided by Maastricht University Medical Center:

Additional relevant MeSH terms:
Diabetes Mellitus
Diabetes Mellitus, Type 2
Glucose Metabolism Disorders
Metabolic Diseases
Endocrine System Diseases