Tissue Partitioning in Early Childhood

This study has been completed.
Sponsor:
Information provided by (Responsible Party):
Krista Casazza, University of Alabama at Birmingham
ClinicalTrials.gov Identifier:
NCT01041794
First received: December 30, 2009
Last updated: April 18, 2012
Last verified: April 2012
  Purpose

Early childhood (~4-6 years of age) is an important window for determining body composition trajectory and may be a critical period for the development of tissue partitioning patterns that influence later disease risk, including obesity and type 2 diabetes. As adiposity accelerates during this critical period, deposition/ preservation of fat stores may be sustained at the 'expense' of other tissues; i.e. energy homeostasis may be inherently biased toward fat gain. The type and amount of tissue mass accrued in early childhood has implications for metabolic profile, glucose/insulin homeostasis, hormone profile and resting energy expenditure.

The interplay between fat and bone deposition represents a physiologic trait enabling the body to choose between shuttling 'energy' towards accrual of a particular tissue. Plausibly the phenotype underlying obesity and diabetes risk may be determined by the differentiation of cell type (adipocyte, osteocyte, etc.) during this early stage of growth and development. In vitro studies demonstrate transdifferentiation under the influence of specific external stimuli, which can switch phenotypes toward other cell lineages. Further, rodent models have demonstrated that exposure to stimuli (exercise) early in life may prevent excess fat mass accrual in adulthood, even when the stimulus is later removed (animals are no longer exercising). Children's early experiences (engagement in physical activity) may 'environmentally induce' alterations in body composition and predispose individuals to diabetes throughout life (Figure 1).

Hypotheses and Specific Aims: Early growth patterns and cell differentiation may induce long term effects on body composition by impacting biological and hormonal axes that regulate childhood body composition. Body composition comprises not only absolute mass, but also aspects of size, shape and location. To that end, the following specific aims will be evaluated:

  1. Quantify body composition, adipose tissue distribution, and relative tissue ratios using magnetic resonance imaging (MRI) and dual-energy x-ray absorptiometry (DXA).

    1. Hypothesis: Early partitioning of 'resources' toward fat mass accrual will lead to decreased gains in bone mass that may persist long-term.
    2. Hypothesis: Partitioning of tissue toward fat at the expense of bone mass (and indirectly, lean mass) will result in adverse effects on glucose/insulin metabolism, total energy expenditure, resting metabolic rate and hormone signaling.
    3. Hypothesis: Children with greater levels of physical activity (energy expenditure) will have greater partitioning towards bone (and lean) mass.
  2. Quantify adipose tissue distribution and adipocyte cell size and number using MRI and histological techniques.

    1. Hypothesis: A relatively greater amount of bone marrow adipose tissue will be apparent in those children with low levels of physical activity, resulting in the preferential differentiation of pluripotent stem cells towards adipocytes vs osteocytes in the bone marrow cavity.
    2. A relatively greater adipocyte cell number will be apparent in those children with low levels of physical activity indicating greater differentiation of MSC towards adipocytes vs osteocytes.

Condition
Changes in Bone Mineral Content
Changes in Bone Marrow Adipose Tissue

Study Type: Observational
Study Design: Observational Model: Cohort
Official Title: Tissue Partitioning in Early Childhood: A Critical Period for Obesity Risk?

Resource links provided by NLM:


Further study details as provided by University of Alabama at Birmingham:

Primary Outcome Measures:
  • To evaluate if early life experiences may induce long term effects on body composition by impacting biological and hormonal axes that regulate childhood body composition. [ Time Frame: 1 year ] [ Designated as safety issue: No ]

Biospecimen Retention:   Samples With DNA

Samples will be labeled with the study protocol number, a unique identifier, and the date of collection.

Blood specimens will be obtained by the nursing staff at the PCIR. The PCIR processing lab will process the samples, which will then be stored in a locked freezer at -80oC in the restricted access CNRU Metabolism Core lab (WEBB 337).


Enrollment: 24
Study Start Date: December 2009
Study Completion Date: June 2011
Primary Completion Date: December 2010 (Final data collection date for primary outcome measure)

  Eligibility

Ages Eligible for Study:   3 Years to 7 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population

Healthy children aged three to seven years

Criteria

Inclusion Criteria:

  • Healthy
  • Aged 3-7 years
  • Not taking medications known to affect body composition or metabolism

Exclusion Criteria:

  • Not meeting inclusion criteria
  Contacts and Locations
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Please refer to this study by its ClinicalTrials.gov identifier: NCT01041794

Locations
United States, Alabama
UAB
Birmingham, Alabama, United States, 35294
Sponsors and Collaborators
University of Alabama at Birmingham
  More Information

No publications provided

Responsible Party: Krista Casazza, Krista R. Casazza PhD, RD/Assistant Professor, UAB, University of Alabama at Birmingham
ClinicalTrials.gov Identifier: NCT01041794     History of Changes
Other Study ID Numbers: F091006004
Study First Received: December 30, 2009
Last Updated: April 18, 2012
Health Authority: United States: Institutional Review Board

Keywords provided by University of Alabama at Birmingham:
body composition
fat distribution
exercise
diet

ClinicalTrials.gov processed this record on August 28, 2014