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The Impact of Fitness on Vascular Dysfunction in Adolescents With Type 1 Diabetes

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. Identifier: NCT01337947
Recruitment Status : Completed
First Posted : April 19, 2011
Last Update Posted : September 29, 2014
Information provided by (Responsible Party):
Eugene Barrett, University of Virginia

Brief Summary:
The principal hypothesis of this study is that the micro and macro vasculature of young diabetes mellitus type 1 (DM1) patients is particularly susceptible to atherogenic factors which cause vascular dysfunction at multiple levels of the arterial vasculature and that this dysfunction is demonstrable using state-of-the-art ultrasound methods. The investigators further hypothesize that interventions, such as exercise, that are readily integrated into the daily life of individuals with DM1 can mitigate or reverse these early vascular changes and thereby diminish the otherwise predictable longer-term development of cardiovascular disease (CVD) in type 1 DM

Condition or disease Intervention/treatment
Type 1 Diabetes Drug: Definity microbubbles

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Study Type : Observational
Actual Enrollment : 32 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: The Impact of Fitness on Vascular Dysfunction in Adolescents With Type 1 Diabetes
Study Start Date : April 2011
Actual Primary Completion Date : November 2013
Actual Study Completion Date : November 2013

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Diabetes Type 1
Drug Information available for: Perflutren

Group/Cohort Intervention/treatment
exercise training
12 weeks of exercise treatment/program for DM1 subjects
Drug: Definity microbubbles
Definity microbubbles are used as a contrast agent to image blood flow in skeletal muscle
Other Name: Definity

Primary Outcome Measures :
  1. arterial vascular stiffness [ Time Frame: 2 years ]

    Arterial Stiffness will be measured as follows:

    1. Pulse wave velocity (m/sec)
    2. Augmentation index ( %)

Secondary Outcome Measures :
  1. nitric oxide dependent vasodilation [ Time Frame: 2 years ]

    NO dependent vasodilation will be measured by:

    1. Flow Mediated dilation of brachial artery (% of brachial artery diameter change)
    2. Post ischemic flow velocity in brachial artery ( m/sec)
    3. Forearm microvascular perfusion using contrast ultrasound ( video intensity)

Information from the National Library of Medicine

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Ages Eligible for Study:   12 Years to 18 Years   (Child, Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
DM1 and healthy controls

Inclusion Criteria: You may be eligible if you are:

  • Male or female, 12-18 years of age
  • Healthy, no chronic illness other than DM1
  • No medications that would affect the blood vessels
  • Non-smoker
  • Normal height and weight

Requirements for both groups (study 1)

  • Two outpatient visits lasting ~1 to 1 ½ hours
  • 1 outpatient admission lasting ~ 10 hrs
  • Most visits require blood draws Requirements for second part of study for DM1 group (study 2)
  • Two additional outpatient visits (one requires blood draw)
  • 12 weeks of an exercise program (5 days per week, 3 of them here at UVA)
  • Maintain healthy diet for those 12 weeks-you will have diet instruction
  • Repeat outpatient admission as described above

Exclusion Criteria:

  • under 12 or over 18 years of age
  • medication that could affect the blood vessels
  • smoker
  • above average BMI
  • chronic illness other than DM1

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 identifier (NCT number): NCT01337947

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United States, Virginia
University of Virginia
Charlottesville, Virginia, United States, 22903
Sponsors and Collaborators
University of Virginia
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Principal Investigator: Eugene Barrett, MD University of Virginia
Additional Information:

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Responsible Party: Eugene Barrett, Eugene Barrett, MD, PhD, University of Virginia Identifier: NCT01337947    
Other Study ID Numbers: IRB- HSR #15312
First Posted: April 19, 2011    Key Record Dates
Last Update Posted: September 29, 2014
Last Verified: April 2011
Keywords provided by Eugene Barrett, University of Virginia:
Type 1 diabetes
vascular function
Additional relevant MeSH terms:
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Diabetes Mellitus
Diabetes Mellitus, Type 1
Glucose Metabolism Disorders
Metabolic Diseases
Endocrine System Diseases
Autoimmune Diseases
Immune System Diseases