- ICH GCP
- US Clinical Trials Registry
- Klinisk forsøg NCT01990872
Inter-relationship Between Vitamin D Requirements and Calcium Intake in Older Adults (VitD-Ca)
Randomized Controlled Trial to Explore the Inter-relationship Between Vitamin D Requirements and Calcium Intake
Studieoversigt
Status
Betingelser
Intervention / Behandling
Detaljeret beskrivelse
The aim of this study is to perform a randomised controlled vitamin D3 intervention study in apparently healthy, free-living adults (aged 50+ y) to investigate whether different levels of habitual calcium intake, ranging from low-moderate to high, influence serum 25(OH)D concentrations and indices of vitamin D activation and catabolism during winter, when vitamin D intake is adequate versus inadequate.
This research will provide new data and scientific understanding in relation to the impact of different levels of dietary calcium intake on vitamin D requirements in the older adult population. As such, this new data will inform dietary reference values for vitamin D.
Undersøgelsestype
Tilmelding (Faktiske)
Fase
- Ikke anvendelig
Kontakter og lokationer
Studiesteder
-
-
-
Cork, Irland
- Human Dietary Studies Facility, School of Food and Nutritional Sciences, University College Cork, Cork, Ireland
-
-
Deltagelseskriterier
Berettigelseskriterier
Aldre berettiget til at studere
Tager imod sunde frivillige
Køn, der er berettiget til at studere
Beskrivelse
Inclusion Criteria:
Consenting white men and women aged ≥ 50 y
Exclusion Criteria:
- Unwilling to discontinue consumption of vitamin D-containing supplements 4 wks before the initiation of the study and throughout the study.
- Planning to take a winter vacation (during the course of the 15-wk intervention) to a location at which either the altitude or the latitude was predicted to result in significant cutaneous vitamin D synthesis from solar radiation (e.g., a winter sun coastal resort or a mountain ski resort)
- Use of tanning facilities of any type.
- Pregnancy or planning to become pregnant during the study
- A severe medical illness,
- hypercalcaemia,
- Known intestinal malabsorption syndrome,
- Excessive alcohol use,
- Taking medications known to interfere with vitamin D metabolism
Studieplan
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Primært formål: Forebyggelse
- Tildeling: Randomiseret
- Interventionel model: Parallel tildeling
- Maskning: Dobbelt
Våben og indgreb
Deltagergruppe / Arm |
Intervention / Behandling |
|---|---|
|
Placebo komparator: Placebo in high calcium group
Placebo + habitual dietary calcium intake (>1000 mg/d)
|
Placebo (0 micrograms vitamin D3/day)
|
|
Aktiv komparator: Vitamin D3 in low/moderate calcium group
Vitamin D3 (20 microgram/day) + habitual calcium intake <700 mg/d
|
Vitamin D3 (20 micrograms/day)
|
|
Placebo komparator: Placebo in low/moderate calcium group
Placebo + habitual calcium intake <700 mg/d
|
Placebo (0 micrograms vitamin D3/day)
|
|
Aktiv komparator: Vitamin D3 in high calcium group
Vitamin D3 (20 microgram/day) + habitual calcium intake (>1000 mg/d)
|
Vitamin D3 (20 micrograms/day)
|
Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
Tidsramme |
|---|---|
|
Response of serum 25(OH)D concentration over winter in subjects stratified by calcium intake
Tidsramme: 0, 8, 15 weeks
|
0, 8, 15 weeks
|
Sekundære resultatmål
Resultatmål |
Tidsramme |
|---|---|
|
Serum albumin-adjusted calcium
Tidsramme: 0, 8, 15 weeks
|
0, 8, 15 weeks
|
|
serum parathyroid hormone
Tidsramme: 0, 8, 15 weeks
|
0, 8, 15 weeks
|
|
Serum 24,25(OH)2D
Tidsramme: 0 and 15 weeks
|
0 and 15 weeks
|
|
Serum 1,25(OH)2D
Tidsramme: 0 and 15 weeks
|
0 and 15 weeks
|
|
Serum free 25(OH)D
Tidsramme: 0 and 15 weeks
|
0 and 15 weeks
|
|
Serum vitamin D binding protein
Tidsramme: 0 and 15 weeks
|
0 and 15 weeks
|
Samarbejdspartnere og efterforskere
Sponsor
Efterforskere
- Ledende efterforsker: Kevin D Cashman, BSc. PhD, University College Cork
Publikationer og nyttige links
Generelle publikationer
- Cashman KD, Kinsella M, Walton J, Flynn A, Hayes A, Lucey AJ, Seamans KM, Kiely M. The 3 epimer of 25-hydroxycholecalciferol is present in the circulation of the majority of adults in a nationally representative sample and has endogenous origins. J Nutr. 2014 Jul;144(7):1050-7. doi: 10.3945/jn.114.192419. Epub 2014 May 14.
- Cashman KD, Hayes A, O'Donovan SM, Zhang JY, Kinsella M, Galvin K, Kiely M, Seamans KM. Dietary calcium does not interact with vitamin D(3) in terms of determining the response and catabolism of serum 25-hydroxyvitamin D during winter in older adults. Am J Clin Nutr. 2014 Jun;99(6):1414-23. doi: 10.3945/ajcn.113.080358. Epub 2014 Apr 2.
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
- PR-IC-1111-10005
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