Effects of vitamin D supplementation on upper and lower body muscle strength levels in healthy individuals. A systematic review with meta-analysis.

What It Covers

Researchers studied Vitamin D, K2, Magnesium and Zinc in this meta-analysis publication.

To investigate the effects of vitamin D supplementation on muscle strength in healthy individuals.

Who the Included Studies Covered

By PubMed's age tags, the people studied were teenagers, young adults and adults, both men and women.

Included in the review were controlled and randomised controlled trials, published in English, which measured muscle strength and serum vitamin D concentration in participants 18-40 years old.

How the Review Was Done

A systematic review with meta-analysis.

In October 2013 a computerised literature search of three databases (PubMed, Web of Knowledge and Scopus) was performed.

References of identified articles were then cross-checked and citations scanned for additional articles.

Quality was assessed using the PEDro scale.

Muscle strength and vitamin D levels were extracted for a meta-analysis on upper and lower limb strength with standardised mean differences calculated to analyse effect.

What Was Measured

PubMed files the paper under topics including Dietary Supplements, Lower Extremity, Muscle Strength, Randomized Controlled Trials as Topic, Vitamin D and Vitamins.

The authors tagged it with the keywords Dietary supplementations, Muscle function, Muscle performance and Randomised controlled trial.

What This Means in Plain Language

This is a meta-analysis of Vitamin D, K2, Magnesium and Zinc.

The abstract goes on to report its results in about 6 sentences; this page does not restate them, so read the paper for the findings and their limits.

The publication is from 2015 (Journal of science and medicine in sport), a journal based in Australia.

More context: the Vitamin D, K2, Magnesium and Zinc compound page, all human trials.