Correcting Vitamin D Insufficiency Improves Some But Not All Aspects of Physical Performance During Winter Training in Taekwondo Athletes.

What Was Tested

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

The researchers investigated the effects of vitamin D3 supplementation on physical performance during winter training in vitamin D insufficient taekwondo athletes.

Blood samples were collected for analyzing serum 25(OH)D concentration.

Who Took Part

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

How the Study Was Run

In design terms this was a randomized, double-blind and placebo-controlled study.

The participants were allocated by chance, so the Vitamin D, K2, Magnesium and Zinc group and the comparison group should start out alike.

As a double-blind Vitamin D, K2, Magnesium and Zinc study, the assignments were hidden from both participants and investigators until the end.

The comparison arm used a placebo, so changes seen with Vitamin D, K2, Magnesium and Zinc could be set against what happens without it.

What Was Measured

Physical performance tests included Wingate anaerobic test, isokinetic muscle strength and endurance, a countermovement jump test, sit-ups, agility test, and 20-m pacer.

The subject headings attached to it are Athletes, Cholecalciferol, Dietary Supplements, Exercise Test, Hydroxycholecalciferols, Martial Arts and Muscle Strength.

Author keywords: anaerobic power, isokinetic muscle strength, physical fitness and vitamin D supplementation.

What This Means in Plain Language

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

The publication is from 2018 (International journal of sport nutrition and exercise metabolism), a journal based in United States.

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