- ICH GCP
- US Clinical Trials Registry
- Klinisk forsøg NCT00589498
Fat Gain and Cardiovascular Disease Mechanisms
Understanding the mechanisms of obesity-induced hypertension is important both for prevention and therapy. Studies of patients with established obesity have provided valuable information on pathophysiologic links between obesity and both blood pressure and cardiovascular risk. However, these studies are necessarily limited by the heterogeneity of obesity-associated disease so that the relative contribution of obesity or hypertension or other co-existing diseases to specific regulatory abnormalities is often not clear. Clarification of whether any abnormalities associated with increased cardiovascular risk were present before or after the development of obesity has also been problematic.
We therefore propose a series of novel studies directed at establishing the effects of increased body fat in otherwise healthy individuals. We will determine the distribution patterns of increased body fat and how both increased body fat and fat distribution relate to changes in blood pressure, and in neural, endothelial and inflammatory mechanisms which have been implicated in the development and progression of cardiac and vascular disease.
We will study non-obese subjects with and without a family history of hypertension. These subjects will undergo an eight-week program of overfeeding with the objective of inducing a 4 kg fat gain. We will determine the nature of fat distribution in these individuals after the fat gain program and subsequently after an eight-week period of weight loss and restoration of normal body weight. Measurements will be compared to those obtained in a matched control group with and without a family history of hypertension, who will continue their normal diets. We will test the following hypotheses:
- Individuals with a family history of hypertension will gain more visceral fat and upper body subcutaneous fat and will have greater blood pressure increases with overfeeding- compared with those without such a family history.
- For all overfed subjects, increases in blood pressure and insulin resistance with fat gain will be most marked in those individuals with a predominantly upper body and visceral fat accumulation.
- Upper body and visceral fat gain will also be associated with greater impairment in cardiovascular function, higher nocturnal blood pressures and an increased likelihood of sleep disordered breathing.
Studieoversigt
Status
Betingelser
Intervention / Behandling
Undersøgelsestype
Tilmelding (Faktiske)
Fase
- Fase 3
Kontakter og lokationer
Studiesteder
-
-
Minnesota
-
Rochester, Minnesota, Forenede Stater, 55905
- Mayo Clinic
-
-
Deltagelseskriterier
Berettigelseskriterier
Aldre berettiget til at studere
Tager imod sunde frivillige
Køn, der er berettiget til at studere
Beskrivelse
Inclusion Criteria:
- We will enroll up to 180 subject in order to fulfill screening requirements and have complete studies in 120 total (60 with and 60 without family history hypertension).
- Gender: Male and female.
- Ages: 18 to 40 (inclusive).
Exclusion Criteria:
- Body-mass index > 33 kg/m2
- Tobacco smoking or chewing
- Shift worker
- Any diseases
- Any prescription medications (except, oral contraceptives are permitted)
Studieplan
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Primært formål: Forebyggelse
- Tildeling: Randomiseret
- Interventionel model: Parallel tildeling
- Maskning: Enkelt
Våben og indgreb
Deltagergruppe / Arm |
Intervention / Behandling |
---|---|
Eksperimentel: 1
Subjects who are randomized to overfeed will visit with the General Clinical Research Center dieticians as often as necessary to gain 2 kg of fat (about 4 kg overall) over a period of 8 weeks.
|
Each subject received 1000 kcal/d in addition to weight maintenance requirements.
The diet composition throughout the study was 40% carbohydrate, 40% fat, and 20% protein.
|
Ingen indgriben: 2
Subjects who are randomized to non-overfeeding will continue with their normal diet and activity levels for a period of 8 weeks.
|
Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
Tidsramme |
---|---|
Individuals with a family history of hypertension will gain more visceral fat and upper body subcutaneous fat and will have greater blood pressure increases with overfeeding- compared with those without such a family history.
Tidsramme: conclude the 180 patients recruited
|
conclude the 180 patients recruited
|
Sekundære resultatmål
Resultatmål |
Tidsramme |
---|---|
* For all overfed subjects, increases in blood pressure and insulin resistance with fat gain will be most marked in those individuals with a predominantly upper body and visceral fat accumulation.
Tidsramme: after recruiting at least 70 patients
|
after recruiting at least 70 patients
|
Upper body and visceral fat gain will also be associated with greater impairment in cardiovascular function, higher nocturnal blood pressures and an increased likelihood of sleep disordered breathing
Tidsramme: Recruit at least 70 subjects
|
Recruit at least 70 subjects
|
Increased weight gain, particularly in the upper body and visceral regions, will be accompanied by enhanced production of inflammatory mediators linked to cardiovascular risk, including adhesion molecules and C-reactive protein.
Tidsramme: Recruit at least 70 patients
|
Recruit at least 70 patients
|
These changes will resolve with subsequent loss of weight at the end of the overfeeding program and restoration of normal body fat and fat distribution.
Tidsramme: Recruit at least 70 patients
|
Recruit at least 70 patients
|
Samarbejdspartnere og efterforskere
Sponsor
Samarbejdspartnere
Publikationer og nyttige links
Hjælpsomme links
Datoer for undersøgelser
Studer store datoer
Studiestart
Primær færdiggørelse (Faktiske)
Studieafslutning (Faktiske)
Datoer for studieregistrering
Først indsendt
Først indsendt, der opfyldte QC-kriterier
Først opslået (Skøn)
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Skøn)
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidst verificeret
Mere information
Begreber relateret til denne undersøgelse
Yderligere relevante MeSH-vilkår
Andre undersøgelses-id-numre
- 652-03
- NIH HL-073211
Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .
Kliniske forsøg med Søvnapnø syndromer
-
University of Wisconsin, MadisonPhilips HealthcareAfsluttetSøvn, Slow-wave Sleep, Sleep Enhancement, Sleep Optimization
-
Aventure ABAktiv, ikke rekrutterende
-
National Taiwan University HospitalUkendt
-
National University of SingaporeRekrutteringReduktion af skærmbrug + Sleep Extension | Frit levendeSingapore
-
The First Affiliated Hospital of Shanxi Medical...Shanxi Medical UniversityAfsluttetSøvnkvalitet | Søvnvarighed | Sleep Onset LatencyKina
-
Maastricht University Medical CenterEpilepsiecentrum KempenhaegheAfsluttetRolandsk Epilepsi | Landau-Kleffners syndrom | Natlig frontallappens epilepsi | Elektrisk status Epilepticus under Slow Wave SleepHolland
-
Northwell HealthJazz PharmaceuticalsRekrutteringElektrisk status Epilepticus af Slow-Wave SleepForenede Stater
-
Tyco Healthcare GroupUkendt
-
University of Geneva, SwitzerlandAfsluttetNatlige benkramper | Sleep Wake Transition DisordersSchweiz
-
Riphah International UniversityAfsluttet
Kliniske forsøg med 1000 extra calories
-
Vårdcentralen ÅbyUniversity Hospital, Linkoeping; Vinnova; The Swedish Research Council for... og andre samarbejdspartnereAfsluttet
-
Mahidol UniversityRekrutteringSvært akut respiratorisk distress syndrom | Refraktær hypoxæmiThailand
-
B.P. Koirala Institute of Health SciencesAfsluttet
-
Centre Hospitalier Universitaire de NiceAfsluttet
-
Aultman Health FoundationAfsluttet
-
Vyaire MedicalIkke rekrutterer endnuVentilationsterapi; Komplikationer
-
Ablon Skin Institute Research CenterIrish Response t/a Lifes2goodAfsluttet
-
Centre Hospitalier Universitaire de NiceAfsluttet
-
University of California, IrvineAfsluttetCerebral iskæmiForenede Stater
-
NeuroEM Therapeutics, Inc.University of South Florida Health / Byrd Alzheimer's InstituteUkendtAlzheimers sygdom | Alzheimers sygdom, sent indtrædenForenede Stater