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Endothelial Dysfunction in Obese Children (EDOC)

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified October 2011 by Conraads Viviane, University Hospital, Antwerp.
Recruitment status was:  Recruiting
Information provided by (Responsible Party):
Conraads Viviane, University Hospital, Antwerp Identifier:
First received: October 24, 2011
Last updated: October 28, 2011
Last verified: October 2011
The purpose of this study is to objectify the effect of diet and exercise on early markers of atherosclerosis in obese children.

Condition Intervention Phase
Behavioral: Exercise training
Behavioral: Usual care
Phase 3

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Adolescent Obesity: What Determines Vascular Endothelial Dysfunction And Is The Process Reversible?

Resource links provided by NLM:

Further study details as provided by Conraads Viviane, University Hospital, Antwerp:

Primary Outcome Measures:
  • Change from baseline in Reactive Hyperemia Index at 5 and 10 months [ Time Frame: Baseline - 5 months - 10 months ]
    Reactive Hyperemia Index as assessed using endoPAT (R) is used as a marker for endothelial function

Secondary Outcome Measures:
  • Change from baseline in exercise capacity at 5 and 10 months [ Time Frame: Baseline - 5 months - 10 months ]
    Exercise capacity will be assessed using bicycle ergometry

  • Change from baseline in Body Mass Index and body composition at 5 and 10 months [ Time Frame: Baseline - 5 months - 10 months ]
    Weight and Length will be assessed to calculate Body Mass Index(BMI) and BMI-Z-score. Dual-X-Ray Absorptiometry will be used to estimate body composition

Estimated Enrollment: 60
Study Start Date: June 2011
Estimated Study Completion Date: September 2013
Estimated Primary Completion Date: July 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Exercise training Behavioral: Exercise training
Individualized and progressively increased supervised aerobic exercise program on a daily base (3-4hours per day, hypocaloric diet and psychological guidance
Usual Care Behavioral: Usual care
Nutritional assessment and dietary advice by general practitioner, promotion of sports activities

Detailed Description:

The favorable responses of combined treatment strategies, consisting of exercise training and proper diet change, for childhood and adolescent obesity on vascular health are poorly understood. The overall objective of this research project is to investigate the underlying pathophysiological mechanisms that mediate these beneficial effects.

Particularly, the following aims are set forth:

  1. To establish the effect of a combined lifestyle intervention, i.e. an individualized exercise training and caloric restriction program, on vascular function (primary endpoint) and structure in a substantial population of obese adolescents.
  2. To characterize causal pathways between obesity and endothelial dysfunction with focus on classical risk factors, oxidative and inflammatory stress, metabolic adaptations, bone marrow derived progenitor cells, and blood microparticles.

This research knowledge will be instrumental for risk stratification and clinical management aimed to improve endothelial function by limiting damage and reinforcing regenerative mechanisms in obese adolescents.


Ages Eligible for Study:   12 Years to 18 Years   (Child, Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria: Children with severe obesity

  • Younger than 16 yrs: BMI ≥97th sex and age specific BMI-percentile
  • Older than 16 yrs: BMI ≥35 kg/m²

Exclusion Criteria:

  • Acute or chronic inflammatory process, use of non-steroidal anti- inflammatory drugs or immunosuppressive drugs. (including inhalation corticosteroids).
  • Structural heart disease or other cardiac diseases.
  • Active malignant hematological disease
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01461226

Contact: Viviane M Conraads, M.D., PhD 38215672 ext 0032
Contact: Luc Bruyndonckx, M.D. 38215222 ext 0032

Zeepreventorium Recruiting
De Haan, Belgium, 8420
Contact: Hilde Franckx, M.D.    59233911 ext 0032   
Principal Investigator: Hilde Franckx, M.D.         
Dienst Cardiale Revalidatie, Cardiologie, Universitair Ziekenhuis Antwerpen Recruiting
Edegem, Belgium, 2650
Contact: Viviane M Conraads, M.D.,PhD    38214672 ext 0032   
Sub-Investigator: Luc Bruyndonckx, M.D.         
Dienst Pediatrie, Universitair Ziekenhuis Antwerpen Recruiting
Edegem, Belgium, 2650
Contact: José Ramet, M.D, PhD    38214115 ext 0032   
Principal Investigator: José Ramet, M.D., PhD         
Sub-Investigator: Luc Bruyndonckx, M.D.         
Sponsors and Collaborators
University Hospital, Antwerp
Principal Investigator: Viviane M Conraads, M.D., PhD Dienst Cardiale Revalidatie, Cardiologie, Universitair Ziekenhuis Antwerpen
  More Information

Responsible Party: Conraads Viviane, Principal Investigator, University Hospital, Antwerp Identifier: NCT01461226     History of Changes
Other Study ID Numbers: EC 11/11/100
Study First Received: October 24, 2011
Last Updated: October 28, 2011

Keywords provided by Conraads Viviane, University Hospital, Antwerp:
cardiovascular risk factors
exercise training
endothelial function
endothelial progenitor cells

Additional relevant MeSH terms:
Nutrition Disorders
Body Weight
Signs and Symptoms
Arterial Occlusive Diseases
Vascular Diseases
Cardiovascular Diseases processed this record on May 25, 2017