Influence of Vitamin D Supplementation by Sunlight or Oral D3 on Exercise Performance.

What Was Tested

The paper reports a study of Vitamin D, K2, Magnesium and Zinc, published as a randomized controlled trial.

To determine the relationship between vitamin D status and exercise performance in a large, prospective cohort study of young men and women across seasons (study 1).

Who Took Part

The study group was 2, men.

The age groups tagged for this paper are young adults and adults, both men and women.

In study 1, the researchers determined 25(OH)D relationship with exercise performance in 967 military recruits.

How the Study Was Run

The researchers set it up as a randomized and placebo-controlled study.

Random assignment meant chance, not the researchers, decided who got Vitamin D, K2, Magnesium and Zinc and who got the comparison, which limits bias.

A placebo (an inactive look-alike) gave the Vitamin D, K2, Magnesium and Zinc group a baseline to be compared against.

The researchers measured serum 25(OH)D by high-pressure liquid chromatography tandem mass spectrometry and endurance, strength and power by 1.5-mile run, maximum dynamic lift and vertical jump, respectively.

What Was Measured

Topics PubMed links to this paper include Athletic Performance, Cholecalciferol, Dietary Supplements, Exercise, Military Personnel, Seasons and Sunlight.

What This Means in Plain Language

The paper is a randomized and placebo-controlled study of Vitamin D, K2, Magnesium and Zinc in 2, men.

With fewer than 40 people, it is a small study, so it is better read as an early signal for further research than as a settled answer.

Results are reported in around 6 sentences of the abstract; we leave them to the paper itself rather than summarise them.

The publication is from 2018 (Medicine and science in sports and exercise), a journal based in United States.

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