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Vitamin D Deficiency in Obese Adolescent Girls and Influence of Vitamin D on Insulin Secretion and Sensitivity

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ClinicalTrials.gov Identifier: NCT00850694
Recruitment Status : Completed
First Posted : February 25, 2009
Last Update Posted : April 10, 2017
Information provided by (Responsible Party):

Study Description
Brief Summary:
Sub-clinical vitamin D deficiency is a commonly unrecognized disorder in obese adolescents. The investigators hypothesize vitamin D deficiency will be highly prevalent in obese adolescents and those who are vitamin D deficient will be more insulin resistant.

Condition or disease
Vitamin D Deficiency Obesity Insulin Resistance

Detailed Description:
This is a cross-sectional study of obese female adolescents matched for age, sex and pubertal staging. Serum 25-OH vitamin D, intact PTH , lipid profile, serum CRP measurements and oral glucose tolerance tests (with glucose and insulin level measurements) will be done to assess the prevalence of vitamin D deficiency and to assess the insulin sensitivity- resistance indices.

Study Design

Study Type : Observational
Actual Enrollment : 114 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: Assessment of Prevalence of Vitamin D Deficiency in Obese Adolescent Girls and Influence of Vitamin D on Insulin Secretion and Sensitivity
Study Start Date : February 2007
Primary Completion Date : October 2010
Study Completion Date : October 2010

Resource links provided by the National Library of Medicine

Drug Information available for: Vitamin D
U.S. FDA Resources

Groups and Cohorts

Obese female adolescents

Outcome Measures

Primary Outcome Measures :
  1. To determine the prevalence of subclinical vitamin D deficiency in obese female adolescents. [ Time Frame: At study entry ]

Secondary Outcome Measures :
  1. To assess the relationship of serum 25 (OH) D statuses to insulin and glucose concentrations during an OGTT and to serum transaminases and CRP. [ Time Frame: At study entry ]

Eligibility Criteria

Information from the National Library of Medicine

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Ages Eligible for Study:   10 Years to 18 Years   (Child, Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Obese female adolescents

Inclusion Criteria:

  • Female adolescents
  • Obese: BMI > 95th percentile
  • Menarchal
  • Tanner stage ≥ 4

Exclusion Criteria:

  • Children with diabetes, other endocrine or acute or chronic medical illnesses, children on oral contraceptive pills, diuretics and anticonvulsant medications
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): NCT00850694

United States, Alabama
Children's Hospital, Universiy of Alabama at Birmingham
Birmingham, Alabama, United States, 35233
Sponsors and Collaborators
University of Alabama at Birmingham
Principal Investigator: Ambika Ashraf University of Alabama at Birmingham
More Information

Responsible Party: Ambika Ashraf, M.D., Assistant Professor, Pediatrics, University of Alabama at Birmingham
ClinicalTrials.gov Identifier: NCT00850694     History of Changes
Other Study ID Numbers: F061228001
First Posted: February 25, 2009    Key Record Dates
Last Update Posted: April 10, 2017
Last Verified: September 2011

Keywords provided by Ambika Ashraf, M.D., University of Alabama at Birmingham:
Vitamin D deficiency
Insulin resistance
Glucose tolerance

Additional relevant MeSH terms:
Insulin Resistance
Vitamin D Deficiency
Glucose Metabolism Disorders
Metabolic Diseases
Deficiency Diseases
Nutrition Disorders
Vitamin D
Hypoglycemic Agents
Physiological Effects of Drugs
Growth Substances
Bone Density Conservation Agents