Vitamin D and Vascular Health in Children
Vitamin D and Vascular Function in Obese Children
연구 개요
상세 설명
Our primary objective is to determine, in obese and overweight children aged 10 to 18 years with vitamin D deficiency (defined as serum 25-hydroxyvitamin D <20 ng/mL), the efficacy of enhanced vitamin D3 supplementation in improving vascular endothelial function, arterial stiffness, insulin sensitivity, and metabolic syndrome risk status; and to assess whether these effects are dose-dependent. As a secondary objective, we will examine the vitamin D supplementation-induced effect on adipokines and inflammatory markers relevant to CVD risk. In a double-masked, controlled trial, we will randomize 252 eligible children to receive either 600 IU (conventional supplementation), or 1000 IU or 2000 IU (enhanced supplementation) of vitamin D3 daily for 6 months.
In terms of reporting of results, the following pre-specified outcomes are included in the primary manuscript (PubMed PMID:31950134 -- see Reference section for citation details)
- Waist Circumference
- Serum High Density Lipoprotein (HDL) Cholesterol
- Serum Triglycerides
- Inflammatory markers (Plasma TNF-alpha, high-sensitivity C-reactive protein, and IL-6)
- Adiopkines (Plasma Leptin and Adiponectin)
Plasma nitric oxide metabolites were not measured.
연구 유형
등록 (실제)
단계
- 해당 없음
연락처 및 위치
연구 장소
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Pennsylvania
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Pittsburgh, Pennsylvania, 미국, 15213
- Primary Care Center, Children's Hospital of Pittsburgh of UPMC
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참여기준
자격 기준
공부할 수 있는 나이
건강한 자원 봉사자를 받아들입니다
연구 대상 성별
설명
Inclusion Criteria:
- Eligible subjects will be 10 to 18 years of age;
- obese or overweight (BMI ≥85th %tile);
- otherwise healthy, and
- have a serum 25(OH)D concentration <20 ng/mL
Children taking multivitamins should be able to hold off their multivitamins during the course of the study.
Exclusion Criteria:
Children will be excluded if they
- (a) have hepatic or renal disease, metabolic rickets, malabsorptive disorders, primary hyperparathyroidism, hyperthyroidism, or other chronic disorders that could affect vitamin D metabolism;
- (b) are receiving treatment with anticonvulsants, systemic glucocorticoids, pharmacologic doses of vitamin D (≥1000 IU of vitamin D2 or D3 daily), antihypertensives, vasoactive drugs, antilipidemics, metformin, antipsychotics, or other oral insulin regulators;
- (c) have cholelithiasis or urolithiasis;
- (d) have type 1 or type 2 diabetes; or
- (e) have a condition or underlying abnormality that could compromise the safety of the subject.
Post-menarchial girls with a positive pregnancy test at randomization, or subjects found during the screening phase to have hypercalcemia (serum calcium >10.8 mg/dL) or significant fasting hyperglycemia (fasting blood glucose ≥ 125 mg/dL) will also be excluded.
공부 계획
연구는 어떻게 설계됩니까?
디자인 세부사항
- 주 목적: 치료
- 할당: 무작위
- 중재 모델: 병렬 할당
- 마스킹: 네 배로
무기와 개입
참가자 그룹 / 팔 |
개입 / 치료 |
|---|---|
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활성 비교기: Vitamin D3 2000 IU
Vitamin D3 2000 IU tablet once daily by mouth for 6 months
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Tablet form
다른 이름들:
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활성 비교기: Vitamin D3 1000 IU
Vitamin D3 1000 IU tablet by mouth once daily for 6 months
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Tablet form
다른 이름들:
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위약 비교기: Vitamin D3 600 IU
Vitamin D3 600 IU tablet by mouth once daily for 6 months
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Tablet form
다른 이름들:
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연구는 무엇을 측정합니까?
주요 결과 측정
결과 측정 |
측정값 설명 |
기간 |
|---|---|---|
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Flow-mediated Dilation (FMD) Percentage
기간: 6 months
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Brachial artery flow-mediated dilation percentage is a measure of endothelial function.
FMD percentage calculation is based on baseline brachial artery diameter(brachialADbase) and change in brachial artery diameter (brachialADchange) during post-occlusive reactive hyperemia.
FMD% was determined using the formula (brachialADchange/brachialADbase) x 100.
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6 months
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2차 결과 측정
결과 측정 |
측정값 설명 |
기간 |
|---|---|---|
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Pulse-wave Velocity (PWV)
기간: 6 months
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PWV is a measure of arterial stiffness.
Higher values of PWV indicate greater degree of arterial stiffness.
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6 months
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Augmentation Index at Heart Rate of 75 Beats/Min (AIx-75)
기간: 6 months
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AIx-75 is a measure of arterial stiffness. AIx was measured through radial arterial tonometry using SphygmoCor. Radial pulse waveform are analyzed through an automatic software function to determine aortic pulse waveform and aortic or central systolic (cSBP) and diastolic blood pressure (cDBP), and these measurements are further analyzed automatically to calculate AIx. AIx is a composite measure of the magnitude of wave reflection and arterial stiffness in all conduit arteries which affect the timing of the wave reflection. AIx = P2-P1/cSBP-cDBP, where P1 is the height of the incident pressure wave form during systole, P2 is the height of the reflected wave added to the incident wave, cSBP is the aortic systolic BP, and cDBP is the aortic diastolic BP. AIx adjusted to heart rate of 75 beats/min (AIx-75) is a validated index of arterial stiffness, with higher values indicating higher degree of arterial stiffness. |
6 months
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Central Systolic Blood Pressure
기간: 6 months
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a measure of cardiometabolic health
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6 months
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Central Diastolic Blood Pressure
기간: 6 months
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a measure of cardiometabolic health
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6 months
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Systemic Systolic Blood Pressure
기간: 6 months
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a measure of cardiometabolic health
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6 months
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Systemic Diastolic Blood Pressure
기간: 6 months
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a measure of cardiometabolic health
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6 months
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Fasting Blood Glucose
기간: 6 months
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a measure of cardiometabolic health
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6 months
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1/Fasting Insulin Ratio
기간: 6 months
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1/fasting insulin ratio is a measure of insulin sensitivity.
Increases in 1/fasting insulin ratio indicate improvements in insulin sensitivity.
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6 months
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기타 결과 측정
결과 측정 |
측정값 설명 |
기간 |
|---|---|---|
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Body Mass Index (BMI)
기간: 6 months
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a surrogate measure of adiposity
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6 months
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공동 작업자 및 조사자
수사관
- 수석 연구원: Kumaravel Rajakumar, MD, MS, University of Pittsburgh, Children's Hospital of Pittsburgh of UPMC
간행물 및 유용한 링크
연구 기록 날짜
연구 주요 날짜
연구 시작 (실제)
기본 완료 (실제)
연구 완료 (실제)
연구 등록 날짜
최초 제출
QC 기준을 충족하는 최초 제출
처음 게시됨 (추정)
연구 기록 업데이트
마지막 업데이트 게시됨 (실제)
QC 기준을 충족하는 마지막 업데이트 제출
마지막으로 확인됨
추가 정보
이 정보는 변경 없이 clinicaltrials.gov 웹사이트에서 직접 가져온 것입니다. 귀하의 연구 세부 정보를 변경, 제거 또는 업데이트하도록 요청하는 경우 register@clinicaltrials.gov. 문의하십시오. 변경 사항이 clinicaltrials.gov에 구현되는 즉시 저희 웹사이트에도 자동으로 업데이트됩니다. .
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