N/A
N=24
Growth Hormone as a Determinant of Weight Regulation
Obesity
Bottom Line
View on ClinicalTrials.gov: NCT00355784 ↗Enrolled (actual)
24
Serious AEs
0.0%
Results posted
Jul 2013
Primary outcome: Primary: 24 Hour Average Plasma Growth Hormone Concentration — 0.4; 1.2; 4.1 ng/mL
Study Design & Population
- Study type
- Interventional
- Phase
- N/A
- Interventions
- overfeeding (Other); growth hormone treatment (Drug)
- Age
- Adult · 18+ yrs
- Sex
- All
- Sponsor
- University of Michigan
- Primary completion
- Dec 2011
Outcome Measures
| Outcome | Result | p-value |
|---|---|---|
| PRIMARY 24 Hour Average Plasma Growth Hormone Concentration |
0.4; 1.2; 4.1 | — |
| PRIMARY Changes in Body Weight |
2.4; 3.6; 3.1 | — |
| PRIMARY Baseline Whole Body Protein Turnover |
2.1; 1.9; 1.6 | — |
| PRIMARY Baseline Skeletal Muscle Protein Synthesis |
0.043; 0.047; 0.033 | — |
| PRIMARY Lipolytic Rate |
180; 200; 195 | — |
| PRIMARY Whole Body Protein Turnover After 2 Week Intervention |
2.8; 2.3; 1.9 | — |
| PRIMARY 2 Week Skeletal Muscle Protein Synthesis |
0.063; 0.062; 0.082 | — |
| PRIMARY Changes in Fat Mass |
1.6; 1.7; 1.1 | — |
| PRIMARY Changes in Fat-free Mass |
0.7; 2.2; 2.3 | — |
Summary
With the alarming increase in the prevalence of obesity, identifying factors that predispose individuals to weight-gain is of critical importance. Even when caloric intake and physical activity levels are well controlled, susceptibility for weight-gain is heterogeneous. Basal metabolic rate (BMR) represents the largest portion of daily energy expenditure in normal adults, and as such, variability in BMR among individuals can be a major factor in determining the susceptibility for gaining weight. However, factors responsible for this variability in BMR and resistance to weight-gain remain unclear. Our preliminary data indicate that high-normal growth hormone (GH) concentration is associated with resistance to weight-gain in rats when overfed and greater weight-loss in humans when underfed. In addition, the investigators have found that the pulsatility of GH secretion has profound effects on several metabolic processes. Therefore, together these findings suggest that endogenous GH secretion is associated with body weight regulation, and the pulsatility (peak amplitude) of GH secretion, rather than the absolute GH concentration, per se, may be responsible for this effect. Because GH influences many of the key metabolic processes that contribute to BMR (e.g.; protein synthesis, proteolysis, substrate cycling), the investigators anticipate that the resistance to weight-gain in persons with elevated GH concentrations will be associated with an increase in BMR due to acceleration of some or all of these processes. Our overall hypothesis is that increased GH secretion can protect against weight-gain due to an augmentation of major metabolic processes that contribute to BMR. Identifying factors responsible for predisposing individuals to weight-gain will lead to establishing improved methods for reducing the prevalence of obesity.
Eligibility Criteria
Inclusion Criteria
Age = 21-35 years Weight stable ( 150 mg/dl) Hematocrit 2 h/week) taking any prescription medication (except birth control)
Data sourced from ClinicalTrials.gov (NCT00355784). Outcome figures and adverse-event rates are extracted automatically from the registry's posted results and are provided for clinician reference, not as a substitute for the primary publication.