Seven-month wintertime supplementation of vitamin D has no effect on hand grip strength in young, physically active males: A randomized, controlled study.

What Was Tested

Researchers studied Vitamin D, K2, Magnesium and Zinc in this randomized controlled trial publication.

There has been a growing interest in the role of vitamin D for the well-being and physical performance of humans under heavy training such as conscripts in military service; however, there is a lack of long-term supplementation studies performed on members of this type of young, physically active, male population.

Who Took Part

PubMed tags the participants as men only.

How the Study Was Run

The design is described as randomized and placebo-controlled.

Because people in this Vitamin D, K2, Magnesium and Zinc study were split into groups at random, differences between the groups are less likely to reflect who happened to join each one.

Some participants received a placebo instead of Vitamin D, K2, Magnesium and Zinc, giving a reference point.

Longitudinal, triple-blinded, randomized, placebo-controlled trial.

Fifty-three male conscripts from the Estonian Army were randomized into two groups: 27 to an intervention group and 26 to a placebo group.

The groups were comparable in terms of their demographics.

The length of the follow-up was 7 months, from October 2016 until April 2017.

Blood serum vitamin D (25(OH)D), parathyroid hormone (PTH), calcium (Ca), ionized calcium (Ca-i), testosterone and cortisol values, and hand grip strength were measured four times during the study period.

What Was Measured

PubMed files the paper under topics including Calcium, Calcium, Dietary, Cholecalciferol, Dietary Supplements, Hand Strength, Vitamin D and Vitamin D Deficiency.

Author keywords: Military training, hand grip and supplementation.

What This Means in Plain Language

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

Its findings take up roughly 7 sentences of the abstract and are left out here on purpose; the source paper is the place to read them.

The publication is from 2022 (Journal of the International Society of Sports Nutrition), a journal based in United States.

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