- ICH GCP
- US Clinical Trials Registry
- Klinisk forsøg NCT01488227
A Prospective Trial on the Effects of Vitamin D Supplementation in Collegiate Swimmers and Divers
A Prospective Trial on the Effects of Vitamin D Supplementation on 25(OH)D, Body Composition and Injury in Collegiate Swimmers and Divers
Objective 1: Determine if Vitamin D supplementation can improve body composition, reduce injuries and illnesses, and improve performance in collegiate swimmers and divers.
Objective 2: Examine how baseline Vitamin D levels predict outcome variables over the course of the intervention period.
Studieoversigt
Status
Betingelser
Intervention / Behandling
Detaljeret beskrivelse
The investigators plan to recruit from approximately 45 male and female University of Kentucky Swimmers and Divers, at least 18 years of age in August 2011. Approximately equal numbers of men and women will be recruited. The entire athletic team(s) will be recruited. With a conservative dropout rate of 30%, the investigators final sample size should be approximately 22 participants (per group).Following baseline measures, participants will be randomized to one of two groups (Vitamin D 4000 IU or Placebo control) and monitored over the course of their athletic season. Measurements will be repeated at Midpoint (3 months) and Endpoint (6 months).
Participants will have no recent history of Vitamin D supplementation beyond what is normally found in a multivitamin (400 IUs).
Following the informed consent process a medical history and Vitamin D questionnaire (screenings), and urine pregnancy test (for female athletes) will be administered prior to more invasive baseline testing procedures (blood draw and DXA). A blood draw will then be conducted at baseline, midpoint and endpoint. Collected blood for the purposes of this study will assess Vitamin D status (25(OH)D), parathyroid hormone, ionized calcium, bone turnover markers, and inflammatory cytokines. A Vitamin D lifestyle questionnaire will be administered at all 3 time points and incidence of illness and injury will be documented over 6 months following randomization. DXA measures will only occur at Baseline and Endpoint.
Undersøgelsestype
Tilmelding (Faktiske)
Fase
- Fase 3
Kontakter og lokationer
Studiesteder
-
-
Kentucky
-
Lexington, Kentucky, Forenede Stater, 40506
- University Of Kentucky
-
-
Deltagelseskriterier
Berettigelseskriterier
Aldre berettiget til at studere
Tager imod sunde frivillige
Køn, der er berettiget til at studere
Beskrivelse
Inclusion Criteria:
- University of Kentucky Swimmers and Divers, at least 18 years old.
- No recent history of Vitamin D supplementation beyond 400IU
Exclusion Criteria:
- hormone replacement therapy,
- high dose Vitamin D supplementation,
- history of renal disease or kidney stones,
- organ transplantation,
- sarcoidosis,
- parathyroid disease,
- history of high blood calcium levels.
Studieplan
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Tildeling: Randomiseret
- Interventionel model: Parallel tildeling
- Maskning: Firedobbelt
Våben og indgreb
Deltagergruppe / Arm |
Intervention / Behandling |
|---|---|
|
Eksperimentel: Vitamin D
|
4000 IU of Vitamin D daily for 6 months
Andre navne:
|
|
Placebo komparator: Oil pill
Contains vegetable and soybean oil supplied by Nature Made by Pharmavite LLC located in Northridge, CA and is United States Pharmacopeia (USP) certified.
|
Acts as a control for the Vitamin D intervention
Andre navne:
|
Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
|
25(OH)D)
Tidsramme: 3 measurement periods over 6 months
|
Baseline, Midpoint, and Endpoint measures include a blood draw for 25(OH)D status.
|
3 measurement periods over 6 months
|
Sekundære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
|
Inflammatory Cytokines
Tidsramme: Baseline and Enpoint
|
Baselineand Endpoint measures include a blood draw inflammatory cytokines (TNF alpha, IL1-B, IL6)
|
Baseline and Enpoint
|
|
Bone Turnover Markers
Tidsramme: Baseline, Midpoint, Endpoint
|
Baseline, Midpoint, and Endpoint measures include a blood draw for bone turnover markers (BSAP, NTx).
|
Baseline, Midpoint, Endpoint
|
|
DXA Body Composition
Tidsramme: Baseline and Endpoint
|
Baseline and Endpoint measures include Body Composition measures (DXA) for fat, muscle and bone composition
|
Baseline and Endpoint
|
|
Vitamin D Lifestyle Survey
Tidsramme: Baseline, Midpoint, Endpoint
|
Baseline, Midpoint, and Endpoint measures include a behavioral survey for estimating 25(OH)D status (solar exposure, food and other supplemental intake)
|
Baseline, Midpoint, Endpoint
|
|
injury and illness incidence
Tidsramme: 6 months
|
We will track injury and illness type and incidence over the course of the 6 month intervention
|
6 months
|
Samarbejdspartnere og efterforskere
Sponsor
Efterforskere
- Studieleder: Maja Redzic, B.S., University Of Kentucky
- Studieleder: Regina M Lewis, B.S., University Of Kentucky
- Ledende efterforsker: David T Thomas, PhD, University Of Kentucky
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
Nøgleord
Yderligere relevante MeSH-vilkår
Andre undersøgelses-id-numre
- UL1RR033173 (U.S. NIH-bevilling/kontrakt)
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 Vitamin D
-
University of LahoreAktiv, ikke rekrutterendeD-vitamin mangel | Diabetes (DM)Pakistan
-
Wroclaw University of Health and Sport SciencesAfsluttetAtleter | Fodboldspillere | Træningsfysiologi | D-vitaminmangel (10 ng/ml til 30 ng/ml)Polen
-
Universidad Autónoma Benito Juárez de OaxacaNational Council of Science and Technology, MexicoAfsluttetFedme | Muskelsvaghed | D-vitamin mangel | Sarkopeni | Aldring | Sarkopenisk fedme | Fedme (lidelse) | Sarkopeni hos ældre | Muskelmasse | Funktionelt fald | Aldersrelateret tab af skeletmuskelmasse | Ældre voksne (65 år og ældre) | Muskelstyrke | Vitamin D 25-Hydroxylase mangelMexico
-
Nutrition Institute, SloveniaSlovenian Research Agency; Higher School of Applied Sciences (VIST); Valens...AfsluttetD-vitamin mangelSlovenien
-
Khon Kaen UniversityAfsluttetEndometriose | D-vitamin status | D-vitaminmangel/mangelThailand
-
Fundación Cardiovascular de ColombiaUniversidad Industrial de Santander; Farma de Colombia SAAfsluttetD-vitamin mangel | Overvægt og fedme | Overvægtige ungeColombia
-
USDA, Western Human Nutrition Research CenterAfsluttet
-
University of AarhusIkke rekrutterer endnuSygdomme i immunsystemet | Vækst | Børns udvikling | D-vitamintilskud
-
Karadeniz Technical UniversityAktiv, ikke rekrutterendeDe, der gav skriftligt informeret samtykke | Kvindeligt køn | Alder 18 år og ældre | Hypotyreose-sygdom | Serum vitamin D < 30 ng/dlTyrkiet (Türkiye)
-
National Nutrition and Food Technology InstituteAfsluttet