The Effect of Vitamin D Statues on Endothelial Function (CVD Cookie)
In the United States, cardiovascular disease causes over one-third of all deaths and vitamin D deficiency is an epidemic. An increasing body of data suggests that low vitamin D status adversely impacts the cardiovascular system. It is our fundamental hypothesis that vitamin D deficiency is a risk factor for cardiovascular disease by causing endothelial dysfunction. Moreover, we hypothesize that vitamin D supplementation will restore endothelial function, thereby reducing cardiovascular disease risk.
This pilot research will be conducted in 64 post-menopausal women participating in an existing study of vitamin D supplementation (32 will receive vitamin D3 2,500 IU daily, the others matching placebo) and will explore the effects of vitamin D on endothelial function and arterial reactivity. Post-menopausal women aged 55-65 years are chosen due to their highest risk for development of a subsequent new cardiovascular disease diagnosis. All study participants will have fasting laboratory and noninvasive vascular ultrasound studies performed at baseline and four months later. The primary outcome measure of this pilot study is change in markers of endothelial function and arterial stiffness with vitamin D3 therapy. If our hypotheses are correct, our long-term goals include investigation of the effect of vitamin D repletion on subclinical atherosclerosis and subsequent cardiovascular events.
Panoramica dello studio
Stato
Condizioni
Intervento / Trattamento
Tipo di studio
Iscrizione (Anticipato)
Fase
- Prima fase 1
Contatti e Sedi
Luoghi di studio
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Wisconsin
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Madison, Wisconsin, Stati Uniti, 53705
- University of Wisconsin Osteoporosis Clinical and Research Program
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Criteri di partecipazione
Criteri di ammissibilità
Età idonea allo studio
Accetta volontari sani
Sessi ammissibili allo studio
Descrizione
Inclusion Criteria:
- Healthy, community-dwelling ambulatory post-menopausal women.
- Able and willing to sign informed consent.
- Ages: 55-65.
- Baseline serum 25OHD concentration > 10 ng/ml and < 60 ng/ml
- Not pregnant
- Willing to avoid use of cod-liver oil and non-study vitamin D supplementation; standard multiple vitamins containing ≤ 400 IU used no more than once daily will be allowed.
- Willing to utilize sunscreen of SPF-15 or higher when sun exposure for more than 15 minutes is expected.
- Willing to fast for 12 hours.
Exclusion Criteria:
- Current hypercalcemia (serum calcium > 10.5 mg/dl) or untreated primary hyperparathyroidism.
- History of nephrolithiasis
- Baseline 24-hour urine calcium > 250 mg
- Known risk factors for hypercalcemia, e.g., malignancy, tuberculosis, sarcoidosis, Paget's disease.
- History of any form of cancer within the past five years with the exception of adequately treated squamous cell or basal cell skin carcinoma.
- Known previous personal history of cardiovascular disease.
- Renal failure; defined as a calculated creatinine clearance (using the Cockroft-Gault approach) of ≤ 25 ml/minute.
- Severe end-organ disease, e.g., cardiovascular, hepatic, hematologic, pulmonary, etc., which might limit the ability to complete this study.
- Treatment with any drug known to interfere with vitamin D metabolism, e.g., phenytoin, phenobarbital.
- Known malabsorption syndromes, e.g., celiac disease, active inflammatory bowel disease, etc.
- Known allergy to chocolate.
- Use of medications known to alter bone turnover including bisphosphonates, estrogen, selective estrogen receptor modulators, parathyroid hormone, testosterone or calcitonin.
- Treatment with any active metabolites of vitamin D, e.g., calcitriol, within six months of screening.
- Use of tanning beds or salons or unwillingness to utilize sunscreen during periods of sun exposure of 15 minutes or longer.
Piano di studio
Come è strutturato lo studio?
Dettagli di progettazione
- Scopo principale: Prevenzione
- Assegnazione: Randomizzato
- Modello interventistico: Assegnazione di gruppo singolo
- Mascheramento: Doppio
Armi e interventi
Gruppo di partecipanti / Arm |
Intervento / Trattamento |
|---|---|
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Comparatore placebo: Control
This group receives placebo chocolate cookies with no vitamin D3 added.
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No (0 IU) vitamin D3 added to cookie.
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Sperimentale: Vitamin D3
This group receives 2500 IU of Vitamin D3 added to a chocolate cookie daily.
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2500 IU Vitamin D3
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Cosa sta misurando lo studio?
Misure di risultato primarie
Misura del risultato |
Lasso di tempo |
|---|---|
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The primary outcome measure of this pilot study is change in markers of endothelial function and arterial stiffness with vitamin D3 therapy.
Lasso di tempo: 17 months
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17 months
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Collaboratori e investigatori
Sponsor
Investigatori
- Investigatore principale: Rekha Ramamurthy, M.D., University of Wisconsin Osteoporosis Clinical Center and Research Program
- Direttore dello studio: Neil C Binkley, M.D., University of Wisconsin Osteoporosis Clinical Center and Research Program
Pubblicazioni e link utili
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Inizio studio
Completamento primario (Effettivo)
Completamento dello studio (Effettivo)
Date di iscrizione allo studio
Primo inviato
Primo inviato che soddisfa i criteri di controllo qualità
Primo Inserito (Stima)
Aggiornamenti dei record di studio
Ultimo aggiornamento pubblicato (Stima)
Ultimo aggiornamento inviato che soddisfa i criteri QC
Ultimo verificato
Maggiori informazioni
Termini relativi a questo studio
Parole chiave
Termini MeSH pertinenti aggiuntivi
Altri numeri di identificazione dello studio
- H-2008-0190
Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .