The Effects of Vitamin D on Skeletal Muscle Strength, Muscle Mass, and Muscle Power: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

CONTEXT: There is growing evidence that vitamin D plays a role on several tissues including skeletal muscle. OBJECTIVE: The aim was to summarize with a meta-analysis, the effects of vitamin D supplementation on muscle function. DATA SOURCES: A systematic research of randomized controlled trials, performed between 1966 and January 2014 has been conducted on Medline, Cochrane Database of Systematics Reviews, Cochrane Central Register of Controlled and completed by a manual review of the literature and congressional abstracts. STUDY SELECTION: All forms and doses of vitamin D supplementation, with or without calcium supplementation, compared with placebo or control were included. Out of the 225 potentially…