AAU Student Projects - visit Aalborg University's student projects portal
A master's thesis from Aalborg University
Book cover


Efficacy of Vitamin D3 Supplementation on Physical Performance in Community-Dwelling Older Adults: A Randomized Parallel Double-Blinded Placebo-Controlled Pilot Study

Translated title

Effekten af D3-vitamintilskud på fysisk præstation hos ældre: Et randomiseret, parallelt, dobbeltblindet, placebokontrolleret pilotstudie

Authors

;

Term

4. term

Publication year

2014

Submitted on

Pages

31

Abstract

Baggrund: Svage benmuskler og nedsat mobilitet øger risikoen for fald hos ældre. Mangel på D‑vitamin er også koblet til flere fald og dårligere fysisk funktion. D‑vitaminreceptorer findes i muskelceller, hvilket tyder på direkte effekter via flere biologiske mekanismer og mulig dæmpning af muskelinflammation, som ofte ses hos ældre. Formål og design: Formålet var at undersøge, om daglig 50 µg (2000 IE) D3 i 12 uger kunne påvirke muskelstyrke og mobilitet hos danske ældre (gennemsnitsalder ca. 73 år). Studiet var planlagt som et randomiseret, dobbeltblindet, placebokontrolleret pilotstudie, hvor hverken deltagere eller forskere vidste, hvem der fik D‑vitamin eller placebo. Målinger: De primære mål var maksimal frivillig kontraktion (MVC, et mål for muskelstyrke) og Timed Up and Go (TUG, tid til at rejse sig fra en stol, gå en kort distance, vende og sætte sig igen). Sekundære mål omfattede tryksmertetærskel (PPT), Bergs Balance-skala, EQ‑5D‑5L (livskvalitet), Falls Efficacy Scale‑International (tryghed ved at undgå fald), falddagbøger samt blodets D‑vitaminniveau [25(OH)D]. Resultater: Alle fem deltagere blev ved en fejl tildelt placebo, så der kunne ikke laves sammenligning mellem D‑vitamin og placebo. Fra start til 12 uger sås statistisk signifikante ændringer i MVC og TUG. Blandt de sekundære mål var det kun 25(OH)D i blodet, der steg efter perioden. Efter behandlingsperioden var højere 25(OH)D desuden forbundet med højere tryksmertetærskel ved begge testtidspunkter. Konklusion: Fordi alle deltagere fik placebo, kan studiet ikke afgøre, om 50 µg D3 dagligt i 12 uger forbedrer muskelstyrke eller TUG hos ældre.

Background: Weak leg muscles and reduced mobility increase fall risk in older adults. Low vitamin D is also linked to more falls and poorer physical function. Vitamin D receptors are present in muscle cells, suggesting direct effects through several biological pathways and possibly by reducing muscle inflammation, which is common in aging. Aim and design: The aim was to test whether a daily dose of 50 µg (2000 IU) vitamin D3 for 12 weeks could affect muscle strength and mobility in Danish older adults (average age about 73 years). The study was planned as a randomized, double-blind, placebo-controlled pilot, meaning neither participants nor researchers knew who received vitamin D or placebo. Measures: Primary outcomes were maximal voluntary contraction (MVC, a measure of muscle strength) and the Timed Up and Go (TUG) test, which times standing up from a chair, walking a short distance, turning, and sitting down. Secondary outcomes included pressure pain threshold (PPT), the Berg Balance Scale, EQ‑5D‑5L (quality of life), the Falls Efficacy Scale‑International (confidence in avoiding falls), fall diaries, and blood vitamin D levels [25(OH)D]. Results: Due to an allocation error, all five participants received placebo, so no vitamin D versus placebo comparison was possible. From baseline to 12 weeks, there were statistically significant changes in MVC and TUG. Among secondary outcomes, only blood 25(OH)D increased after the period. Higher 25(OH)D after treatment was also associated with a higher pressure pain threshold at both test sessions. Conclusion: Because all participants received placebo, this study cannot determine whether 50 µg/day vitamin D3 improves muscle strength or TUG performance in older adults after 12 weeks.

[This abstract was generated with the help of AI]