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Vitamin D Supplementation and Physical Function in Older Adults

15. august 2018 opdateret af: Wake Forest University Health Sciences

Vitamin D Supplementation, Skeletal Muscle Gene Expression, and Physical Performance in Older Adults

A growing body of evidence suggests that vitamin D status is important in biologic processes involved in the maintenance of physical function. To advance the investigators understanding of the role of vitamin D in physical function, the investigators will conduct a feasibility pilot study to collect key information to help design a full-scale randomized trial to determine whether vitamin D supplementation will delay declines in physical function. The primary goals of the pilot study are to determine cost-effective strategies for identifying persons at high risk for functional decline with insufficient vitamin D levels, determine the serum vitamin D response to a vitamin D supplementation regimen designed to attain sufficient vitamin D levels, and provide preliminary data of key functional measures (balance, physical performance and muscle power) for the future larger study design. A secondary goal is to begin to examine potential mechanisms by which vitamin D supplementation may enhance physical performance by exploring the effects of vitamin D supplementation on changes in skeletal muscle gene expression.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

A growing body of evidence suggests that vitamin D status is important in biologic processes involved in the maintenance of physical function. However, whether remediation of vitamin D insufficiency will improve physical function and the potential mechanisms involved are unclear. Previous vitamin D supplementation trials have produced mixed results with respect to physical function; however, most trials did not specifically recruit individuals who were vitamin D insufficient nor is the potential mechanism of action understood well enough to appropriately select those individuals most likely to benefit. To advance our understanding of the role of vitamin D in physical function, the investigators will conduct a feasibility pilot study to collect key information to help design a full-scale randomized trial to determine whether vitamin D supplementation will delay declines in physical function. The primary goals of the pilot study are to determine cost-effective strategies for identifying persons at high risk for functional decline with insufficient vitamin D levels, determine the serum vitamin D response to a vitamin D supplementation regimen designed to attain sufficient vitamin D levels, and provide preliminary data of key functional measures (balance, short physical performance battery (SBBP) and muscle power) for the future larger study design. A secondary goal is to begin to examine potential mechanisms by which vitamin D supplementation may enhance physical performance and muscle contractility by exploring the effects of vitamin D supplementation on changes in skeletal muscle gene expression using microarrays.

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

16

Fase

  • Tidlig fase 1

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

  • Forenede Stater
    • North Carolina
      • Winston-Salem, North Carolina, Forenede Stater, 27157
        • Wake Forest University

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

70 år til 89 år (Ældre voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

  • Short Physical Performance Battery (SPPB) score of ≥ 4 to < 10
  • Vitamin D insufficient (serum 25(OH)D ≥ 10 to < 25 ng/mL)

Exclusion Criteria:

  • Serious or uncontrolled chronic disease including: insulin-dependent or uncontrolled diabetes; cancer requiring treatment in past year, except non-melanoma skin cancers; past or current ischemic heart disease, uncontrolled angina, heart failure, peripheral artery disease (PAD), or stroke; chronic respiratory disease; uncontrolled endocrine/metabolic disease; neurological or hematological disease; liver or renal dysfunction; and severe musculoskeletal impairment
  • Impaired cognitive function (MMSE ≤ 24)
  • Dependent on a cane or walker
  • Use of anti-coagulants
  • Unwillingness to undergo a muscle biopsy
  • Taking prescription vitamin D2 or OCT vitamin D3 supplements of > 1000 IU/d
  • Inability or contraindications to consume daily vitamin D and calcium supplements
  • Weight loss of ≥ 5% or more in the past 6 months
  • Involved in any other intervention

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Behandling
  • Tildeling: Randomiseret
  • Interventionel model: Parallel tildeling
  • Maskning: Enkelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Aktiv komparator: Calcium only
1200 mg Calcium per day
Kosttilskud: calcium
600 mg calcium carbonate twice daily (total of 1200 mg/day) for 4 months
Eksperimentel: Vitamin D plus calcium
2000 IU vitamin D plus 1200 mg calcium per day
Kosttilskud: Vitamin D plus calcium
1000 IU of vitamin D3 twice daily (for a total of 2000 IU/day) plus 600 mg calcium carbonate twice daily (for a total of 1200 mg/day)

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Change in Physical performance
Tidsramme: 4 months
Change in the expanded Short Physical Performance Battery (SPPB) score (composite score including the following: timed 4m walk; time to stand from a chair 5 times without the use of arms; and time to hold side-by-side, semi-tandem, tandem, and one legged stands for the testing of balance)
4 months

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Skeletal muscle gene expression
Tidsramme: 4 months
Muscle will be obtained from the vastus lateralis using the percutaneous needle biopsy technique. Five µg of RNA will be supplied for each experimental condition to be analyzed. The WFUHS MicroArray Core Facility further purifies the provided RNA over an RNAeasy column and performs all subsequent steps of the GeneChip protocol (cDNA generation, generation of biotinylated cRNA, chip hybridization, and generation of .CEL files).
4 months
Change in expanded SPPB balance task time
Tidsramme: 4 months
Change in expanded SPPB balance task time (time to hold side-by-side, semi-tandem, tandem, and one legged stands; max of 30 sec)
4 months
Change in narrow 4m walk test of balance time
Tidsramme: 4 months
Change in time to complete narrow 4m walk test of balance (usual pace over 4m while staying between lines of colored tape placed 20cm apart)
4 months
Change in 400m walk test time
Tidsramme: 4 months
Change in 400m walk test time (usual pace)
4 months
Change in knee extensor power
Tidsramme: 4 months
Change in knee extensor power measured by the Nottingham Power Rig
4 months

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Wake Forest University Health Sciences

Samarbejdspartnere

National Institute on Aging (NIA)

Efterforskere

  • Studieleder: Denise K Houston, PhD, Wake Forest University

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart

1. januar 2010

Primær færdiggørelse (Faktiske)

1. maj 2011

Studieafslutning (Faktiske)

1. maj 2011

Datoer for studieregistrering

Først indsendt

10. august 2010

Først indsendt, der opfyldte QC-kriterier

10. august 2010

Først opslået (Skøn)

11. august 2010

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

17. august 2018

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

15. august 2018

Sidst verificeret

1. august 2018

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • IRB00011371
  • R01AG029364-03S1 (U.S. NIH-bevilling/kontrakt)

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

Studerer et amerikansk FDA-reguleret lægemiddelprodukt

Ja

Studerer et amerikansk FDA-reguleret enhedsprodukt

Ingen

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 Fysisk funktion

Kliniske forsøg med calcium

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