Use of a Test That Evaluates How the Body Handles Insulin and Glucose

August 6, 2008 updated by: National Institute of Allergy and Infectious Diseases (NIAID)

AACTG Modified Frequently Sampled Intravenous Glucose Tolerance Test (FSIVGTT) for the Assessment of Insulin Sensitivity: A Substudy of A5079

The purpose of this study is to find out if testosterone gel affects how the body handles insulin and glucose.

Specific anti-HIV treatments may increase a patient's risk of certain diseases by causing metabolic problems such as reduced sensitivity to insulin. This substudy will examine how testosterone affects insulin sensitivity. If testosterone increases insulin sensitivity in the patients, then giving testosterone to HIV-infected patients may allow the continuation of anti-HIV treatments without increasing the patients' risk of disease. The test used to determine insulin sensitivity will be a modified frequently sampled intravenous glucose tolerance test (FSIVGTT), which can accurately measure insulin sensitivity.

Study Overview

Status

Completed

Conditions

Detailed Description

Assessment of insulin sensitivity is an important objective of this substudy. Extrapolation from earlier studies suggests that insulin resistance will be associated with low testosterone levels at baseline in HIV-infected men with visceral obesity and that physiologic testosterone replacement in these individuals is likely to increase insulin sensitivity. However, direct assessment of insulin sensitivity under carefully controlled conditions is crucial to understanding the full metabolic impact of physiologic testosterone replacement in the context of A5079. The FSIVGTT, using the Bergman minimal model, has become a widely used method for the assessment of insulin sensitivity in epidemiological and intervention studies. Based on these considerations, the modified FSIVGTT was chosen as the optimal modality to assess insulin sensitivity in A5112s.

This study is a substudy of A5079. Patients enrolled in A5079 are eligible for this substudy but receive no study treatment other than that which they receive on A5079. Insulin sensitivity is measured by FSIVGTT performed at entry and at Weeks 24 and 48. In the modified FSIVGTT, 15 serial blood specimens for glucose are drawn over a 245-minute interval. The FSIVGTT assesses whether patients given testosterone supplements have more sensitivity to insulin than patients given a placebo.

Study Type

Observational

Enrollment

50

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • California
      • Los Angeles, California, United States, 900331079
        • Univ of Southern California / LA County USC Med Ctr
      • San Francisco, California, United States, 94110
        • Univ of California San Francisco
    • Hawaii
      • Honolulu, Hawaii, United States, 96816
        • Univ of Hawaii
    • Illinois
      • Chicago, Illinois, United States, 60612
        • Rush Presbyterian - Saint Luke's Med Ctr
    • Indiana
      • Indianapolis, Indiana, United States, 462025250
        • Indiana Univ Hosp
      • Indianapolis, Indiana, United States, 46202
        • Methodist Hosp of Indiana / Life Care Clinic
      • Indianapolis, Indiana, United States, 46202
        • Wishard Hosp
    • New York
      • New York, New York, United States, 10016
        • Bellevue Hosp / New York Univ Med Ctr

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

Male

Description

Inclusion Criteria

Patients may be eligible for this study if they:

  • Are enrolled in A5079.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

National Institute of Allergy and Infectious Diseases (NIAID)

Investigators

  • Study Chair: Shalender Bhasin

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Registration Dates

First Submitted

November 20, 2001

First Submitted That Met QC Criteria

November 20, 2001

First Posted (Estimate)

November 21, 2001

Study Record Updates

Last Update Posted (Estimate)

August 7, 2008

Last Update Submitted That Met QC Criteria

August 6, 2008

Last Verified

February 1, 2004

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • ACTG A5112s
  • AACTG A5112s

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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