ObesityNCT00355784
Growth Hormone as a Determinant of Weight Regulation
A study testing overfeeding and growth hormone treatment in people with Obesity, run by University of Michigan at 1 site in United States.
Trial 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. Read more about this study
- Who is it for?
- Ages 18 to 35 yearsHealthy volunteers can take part
- Conditions the study is for
- Obesity
- What is being tested?
- overfeeding and growth hormone treatment
- Type of treatment
- Injection or infusion
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 24 participants
- Where
- 1 siteUnited States
- Study dates
- Sep 2005to Dec 2015
- Phase
- Interventional
- Are there results?
- Yes, posted in the registrySummary in the doctors' view
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 35 years
- All sexes
- Healthy volunteers accepted
- Adult
Who may be able to join
- Age = 21-35 years Weight stable (< ± 5 pound over past 6 months) Premenopausal (women only) Body mass index 18 - 26 kg/m2 Must be willing to be randomized to receive GH infusion during 2 week Michigan Clinical Research Unit (MCRU) visit
Who cannot join
- Evidence of metabolic or cardiovascular disease Pregnancy (women only) Hyperlipidemia (fasting plasma triglyceride concentration > 150 mg/dl) Hematocrit < 34% Liver Function test abnormalities participating in a regular exercise program (> 2 h/week) taking any prescription medication (except birth control)
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Growth Hormone as a Determinant of Weight Regulation.
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.
Read the detailed description
The susceptibility to gain weight is highly variable even when caloric intake and physical activity are well controlled. Because basal metabolic rate (BMR) represents ~70% of total daily energy expenditure (TDEE), even a small difference in BMR can affect daily energy balance, thereby increasing the susceptibility for gaining weight. Our preliminary data indicate that high-normal growth hormone (GH) secretion is associated with resistance to weight-gain in rats when overfed and greater weight-loss in humans when underfed. Given that GH influences many of the key metabolic processes that contribute to BMR, the investigators hypothesize that persons with high-normal GH will be resistant to weight-gain because of a high BMR, resulting from accelerated rates of these processes. The investigators will measure basal 24h GH secretion and BMR in 106 non-obese men and women. The investigators will also measure protein synthesis, proteolysis, triglyceride/fatty acid cycling (all measured using stable isotope tracer methods) to determine the relationships among these processes, BMR, and GH [Specific Aim 1]. Subjects identified as having "low-normal" (<1.5 ug/L) and "high-normal" (>3 ug/L) 24h GH will then be admitted to the hospital for a 2 wk overfeeding protocol (~2000 kcal/d >TDEE - with restricted physical activity), immediately followed by a 4 wk caloric restriction protocol (~750 kcal/d <TDEE) to compare changes in weight, body composition and intra-abdominal adiposity between these groups that differ markedly in their GH secretion (GH measured before the diet) [Specific Aim 2]. A subset of subjects with low-normal GH will receive intravenous GH throughout the 2 wk overfeeding period at either: 1. a constant rate or 2. as a pulsatile infusion (to mimic endogenous secretion). BMR will be assessed daily and protein synthesis, proteolysis, and triglyceride/fatty acid cycling will be measured at the end of the 2 wks [Specific Aim 3]. The investigators anticipate that a higher GH pulsatility (peak amplitude), rather than elevated GH concentration, per se, will increase protein synthesis, proteolysis, and triglyceride/fatty acid cycling with a resultant increase in BMR and resistance to weight-gain. Identifying factors responsible for predisposing individuals to weight-gain will help combat the alarming rise in the prevalence of obesity.
- Conditions
- Obesity
- Being tested
- overfeeding, growth hormone treatment
- Keywords
- growth hormone, overfeeding, energy expenditure, protein metabolism, lipid metabolism
- Medical subject headings
- Obesity
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
overfeedingOther
overfeeding 2000kcals/day above energy requirements for 14d
growth hormone treatmentDrug
growth hormone administrated for 2 weeks (dose = 1.0 mg/m2/d)
| Study group | Role | What they receive |
|---|---|---|
| Control | Other | 9 non-obese (initial body mass index 23.5 +/- 0.3 kg/m2), weight stable, relatively sedentary (physical activity </- 2h/week), healthy adults not taking any medications were admitted to the hospital for 2 weeks during which time they ate ~4000 kcal/day and their plasma growth hormone concentration was allowed to decline naturally. Receives: Other: overfeeding |
| Growth Hormone Treatment | Experimental | 8 non-obese (initial body mass index 23.5 +/- 0.3 kg/m2), weight stable, relatively sedentary (physical activity </- 2h/week), healthy adults not taking any medications were admitted to the hospital for 2 weeks during which time they ate ~4000 kcal/day and received exogenous growth hormone treatment administered in 4 daily injections to mimic physiological growth hormone secretion throughout the 2-week overeating period. Receives: Other: overfeeding; Drug: growth hormone treatment |
| High Growth Hormone Treatment | Experimental | 5 non-obese (initial body mass index 23.5 +/- 0.3 kg/m2), weight stable, relatively sedentary (physical activity </- 2h/week), healthy adults not taking any medications were admitted to the hospital for 2 weeks during which time they ate ~4000 kcal/day and received a relatively high daily dose of growth hormone. Receives: Other: overfeeding; Drug: growth hormone treatment |
What is being measured
The primary outcome is the main question the study is designed to answer.
24 Hour Average Plasma Growth Hormone Concentration
Measured: 2 weeks
Changes in Body Weight
Measured: 2 weeks
Baseline Whole Body Protein Turnover
Whole body proteolytic rate (Leucine Ra)
Measured: baseline
Baseline Skeletal Muscle Protein Synthesis
after an overnight fast
Measured: baseline
Lipolytic Rate
Measured: 2 weeks
Whole Body Protein Turnover After 2 Week Intervention
whole body proteolytic rate (leucine Ra)
Measured: 2 weeks
2 Week Skeletal Muscle Protein Synthesis
after an overnight fast
Measured: 2 weeks
Changes in Fat Mass
Measured: 2 weeks
Changes in Fat-free Mass
Measured: 2 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted25 Jul 2006 (estimated)
- Study startSep 2005
- Primary completionDec 2011
- Study completionDec 2015
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Posted resultsParticipant flow, outcome measures and adverse events reported by the sponsor.
- Other trials for ObesityStudies of the same condition, open and under way.
- More trials run by University of MichiganThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Diagnosis
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 24 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of Michigan
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, JEFFREY F HOROWITZ, University of Michigan
- Investigators
- Jeffrey F. Horowitz, PhD, Principal investigator, University of Michigan
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00355784
- Sponsor's protocol ID
- R01DK071955-01
- Other IDs
- R01DK071955
- Status last verified
- Dec 2015
- First submitted
- 24 Jul 2006
- Last updated
- 1 Jan 2016
- Results posted
- Yes, on ClinicalTrials.gov
Study at a glance
From the registry record, last updated by the sponsor on 1 Jan 2016. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Growth Hormone as a Determinant of Weight Regulation.
- ClinicalTrials.gov ID
- NCT00355784
- Acronym / sponsor ID
- R01DK071955-01
- Conditions
- Obesity
- Keywords
- growth hormone, overfeeding, energy expenditure, protein metabolism, lipid metabolism
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 24 participants (actual)
- Lead sponsor
- University of MichiganUniversity, hospital or other
- Collaborators
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
- Study start
- Sep 2005
- Primary completion
- Dec 2011 (actual)
- Study completion
- Dec 2015 (actual)
- First posted
- 25 Jul 2006 (estimated)
- Results
- Posted 22 Jul 2013
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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.
Detailed description
The susceptibility to gain weight is highly variable even when caloric intake and physical activity are well controlled. Because basal metabolic rate (BMR) represents ~70% of total daily energy expenditure (TDEE), even a small difference in BMR can affect daily energy balance, thereby increasing the susceptibility for gaining weight. Our preliminary data indicate that high-normal growth hormone (GH) secretion is associated with resistance to weight-gain in rats when overfed and greater weight-loss in humans when underfed. Given that GH influences many of the key metabolic processes that contribute to BMR, the investigators hypothesize that persons with high-normal GH will be resistant to weight-gain because of a high BMR, resulting from accelerated rates of these processes. The investigators will measure basal 24h GH secretion and BMR in 106 non-obese men and women. The investigators will also measure protein synthesis, proteolysis, triglyceride/fatty acid cycling (all measured using stable isotope tracer methods) to determine the relationships among these processes, BMR, and GH [Specific Aim 1]. Subjects identified as having "low-normal" (<1.5 ug/L) and "high-normal" (>3 ug/L) 24h GH will then be admitted to the hospital for a 2 wk overfeeding protocol (~2000 kcal/d >TDEE - with restricted physical activity), immediately followed by a 4 wk caloric restriction protocol (~750 kcal/d <TDEE) to compare changes in weight, body composition and intra-abdominal adiposity between these groups that differ markedly in their GH secretion (GH measured before the diet) [Specific Aim 2]. A subset of subjects with low-normal GH will receive intravenous GH throughout the 2 wk overfeeding period at either: 1. a constant rate or 2. as a pulsatile infusion (to mimic endogenous secretion). BMR will be assessed daily and protein synthesis, proteolysis, and triglyceride/fatty acid cycling will be measured at the end of the 2 wks [Specific Aim 3]. The investigators anticipate that a higher GH pulsatility (peak amplitude), rather than elevated GH concentration, per se, will increase protein synthesis, proteolysis, and triglyceride/fatty acid cycling with a resultant increase in BMR and resistance to weight-gain. Identifying factors responsible for predisposing individuals to weight-gain will help combat the alarming rise in the prevalence of obesity.
Study design
- Primary purpose
- Diagnosis
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 3
| Arm | Type | Receives |
|---|---|---|
| Control | Other | Other: overfeeding9 non-obese (initial body mass index 23.5 +/- 0.3 kg/m2), weight stable, relatively sedentary (physical activity </- 2h/week), healthy adults not taking any medications were admitted to the hospital for 2 weeks during which time they ate ~4000 kcal/day and their plasma growth hormone concentration was allowed to decline naturally. |
| Growth Hormone Treatment | Experimental | Other: overfeeding, Drug: growth hormone treatment8 non-obese (initial body mass index 23.5 +/- 0.3 kg/m2), weight stable, relatively sedentary (physical activity </- 2h/week), healthy adults not taking any medications were admitted to the hospital for 2 weeks during which time they ate ~4000 kcal/day and received exogenous growth hormone treatment administered in 4 daily injections to mimic physiological growth hormone secretion throughout the 2-week overeating period. |
| High Growth Hormone Treatment | Experimental | Other: overfeeding, Drug: growth hormone treatment5 non-obese (initial body mass index 23.5 +/- 0.3 kg/m2), weight stable, relatively sedentary (physical activity </- 2h/week), healthy adults not taking any medications were admitted to the hospital for 2 weeks during which time they ate ~4000 kcal/day and received a relatively high daily dose of growth hormone. |
Who may qualify
- Ages
- 18 to 35 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult
Key inclusion criteria (1 listed)
- Age = 21-35 years Weight stable (< ± 5 pound over past 6 months) Premenopausal (women only) Body mass index 18 - 26 kg/m2 Must be willing to be randomized to receive GH infusion during 2 week Michigan Clinical Research Unit (MCRU) visit
Key exclusion criteria (1 listed)
- Evidence of metabolic or cardiovascular disease Pregnancy (women only) Hyperlipidemia (fasting plasma triglyceride concentration > 150 mg/dl) Hematocrit < 34% Liver Function test abnormalities participating in a regular exercise program (> 2 h/week) taking any prescription medication (except birth control)
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| overfeedingoverfeeding 2000kcals/day above energy requirements for 14d | Other | Control, Growth Hormone Treatment, High Growth Hormone Treatment |
| growth hormone treatmentgrowth hormone administrated for 2 weeks (dose = 1.0 mg/m2/d) | Drug | Growth Hormone Treatment, High Growth Hormone Treatment |
Primary outcome
24 Hour Average Plasma Growth Hormone Concentration
Time frame: 2 weeks
Changes in Body Weight
Time frame: 2 weeks
Baseline Whole Body Protein Turnover
Time frame: baseline
Whole body proteolytic rate (Leucine Ra)
Baseline Skeletal Muscle Protein Synthesis
Time frame: baseline
after an overnight fast
Lipolytic Rate
Time frame: 2 weeks
Whole Body Protein Turnover After 2 Week Intervention
Time frame: 2 weeks
whole body proteolytic rate (leucine Ra)
2 Week Skeletal Muscle Protein Synthesis
Time frame: 2 weeks
after an overnight fast
Changes in Fat Mass
Time frame: 2 weeks
Changes in Fat-free Mass
Time frame: 2 weeks
Results and safety
Loading the posted results from ClinicalTrials.gov…
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 1 Jan 2016.
- Posted resultsParticipant flow, baseline, all outcome measures and adverse events.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Jeffrey F. Horowitz, PhD principal investigator
University of Michigan
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing overfeeding and growth hormone treatment in people with Obesity, run by University of Michigan at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 1 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 1 Jan 2016. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
Yes. Results are posted in the registry (first posted 22 Jul 2013). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
24 Hour Average Plasma Growth Hormone Concentration (time frame: 2 weeks). The study lists 9 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 1 Jan 2016.