- ICH GCP
- US Clinical Trials Registry
- Klinisk forsøg NCT01215682
Vitamin D Supplementation and Upper Respiratory Tract Infections in Adolescent Swimmers
Vitamin D Supplementation, Upper Respiratory Tract Infections, Immune and Physical Functions in Adolescent Swimmers
Background: The medical and economic burden of upper respiratory tract infections (URTIs) is extremely high, while prevention and treatment options are limited. Therefore, there is a constant need for new methods in order to significantly decrease such morbidity. Extensive evidence shows that vitamin D is associated with respiratory health, including in the prevention and treatment of URTIs. Competitive swimmers have a high prevalence of URTIs, and can serve as a model for research in this field.
The study hypothesis is that vitamin D supplementation to young swimmers with low vitamin D levels will reduce the frequency, length, and severity of URTIs and their accompanying functional impairment, while improving cellular immune function and physical function.
Methods: After screening 100 competitive adolescent swimmers to obtain ~60 with low serum levels of vitamin D, this study group will be randomized to receive either vitamin D supplementation (2000 IU/d) or placebo, given in a double blinded fashion for three months. Participants will fill a daily questionnaire regarding frequency, length and severity of URTIs symptoms and functional impairment. Blood will be drawn to evaluate changes in vitamin D status (25(OH)D) and immune function among study participants at the beginning of the study and after supplementation. Physical function on land and in water will also be assessed.
Expected results: Increase in serum 25(OH)D levels following supplementation will significantly decrease the frequency, length and severity of URTI's and their functional impairment, while enhancing the cellular immune system function and physical capacity.
Studieoversigt
Status
Betingelser
Intervention / Behandling
Undersøgelsestype
Tilmelding (Faktiske)
Fase
- Ikke anvendelig
Kontakter og lokationer
Studiesteder
-
-
-
Haifa, Israel
- Maccabi Haifa Swimming Club
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Herzlyia, Israel
- Bnei Herzlyia Swimming Club
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Hod Hasharon, Israel
- Hod Hasharon Swimming Club
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Maccabim, Israel
- Maccabim-Reut Swimming Club
-
-
Deltagelseskriterier
Berettigelseskriterier
Aldre berettiget til at studere
Tager imod sunde frivillige
Køn, der er berettiget til at studere
Beskrivelse
Inclusion Criteria:
- members of swimming team
- training at least 15 hours/week
- low vitamin D plasma levels (<30 ng/ml)
- signed consent forms
Exclusion Criteria:
- chronic health conditions
- taking prescription medications
- taking diet supplementations
Studieplan
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Primært formål: Forebyggelse
- Tildeling: Randomiseret
- Interventionel model: Parallel tildeling
- Maskning: Firedobbelt
Våben og indgreb
Deltagergruppe / Arm |
Intervention / Behandling |
---|---|
Placebo komparator: placebo
|
sweetened water
|
Aktiv komparator: vit D
|
2000 IU/day of vitamin D3 as a once-daily dose
|
Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
---|---|---|
URI frequency
Tidsramme: 3 months
|
URI frequency will be measured in both groups, starting 4 weeks after initiating the suplementation.
Analysis will also assess differences by sex or initial vitamin D levels, as well as by immune function changes.
|
3 months
|
URI duration
Tidsramme: 3 months
|
URI duration will be measured in both groups, starting 4 weeks after initiating the suplementation.
Analysis will also assess differences by sex or initial vitamin D levels, as well as by immune function changes.
|
3 months
|
UTI severity
Tidsramme: 3 months
|
URI severity will be measured in both groups, starting 4 weeks after initiating the suplementation.
Analysis will also assess differences by sex or initial vitamin D levels, as well as by immune function changes.
|
3 months
|
Sekundære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
---|---|---|
plasma vitamin D levels
Tidsramme: 3 months
|
3 months
|
|
immune system function
Tidsramme: 3 months
|
T-cell receptor excision circles (TREC), T cell receptor repertoire, B-cell receptor excision circles (BREC).
Comparison will be made with changes in vitamin D levels and with URI characteristics.
|
3 months
|
physical function
Tidsramme: 3 months
|
absence from school or training, land and swimming fitness tests.
Comparison will be made with changes in vitamin D levels.
|
3 months
|
Samarbejdspartnere og efterforskere
Sponsor
Efterforskere
- Ledende efterforsker: Gal Dubnov-Raz, MD MSc, Sheba Medical Center
- Ledende efterforsker: Naama W Constantini, MD, Hadassah Medical Organziation
- Ledende efterforsker: Avner Cohen, MD, Clalit Health Services
- Ledende efterforsker: Raz Somech, MD PhD, Sheba Medical Center
Publikationer og nyttige 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
Nøgleord
Yderligere relevante MeSH-vilkår
Andre undersøgelses-id-numre
- SHEBA-10-7762-GDR-CTIL
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