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ORIGINAL RESEARCH article

Front. Nutr.
Sec. Sport and Exercise Nutrition
Volume 11 - 2024 | doi: 10.3389/fnut.2024.1501643

The Relationships of Serum Vitamin D Concentration with Linear Speed and Change of Direction (COD) Performance in Soccer Players

Provisionally accepted
Małgorzata M. Michalczyk Małgorzata M. Michalczyk *Martyna Kałuża Martyna Kałuża Grzegorz Zydek Grzegorz Zydek Robert Roczniok Robert Roczniok Artur Gołaś Artur Gołaś
  • Institute of Sport Sciences, Jerzy Kukuczka Academy of Physical Education in Katowice, Katowice, Poland

The final, formatted version of the article will be published soon.

    The aim of the study was to establish whether the level of 25 hydroxyvitamin D (25(OH)D) in serum has an influence on speed (m/s) and change of direction (COD, s) performance. Twenty male soccer players from the top league participated in the study. All subjects were evaluated for the serum concentration of 25(OH)D at the beginning of the preseason. The linear sprint test was performed at 5m and 30m, and COD (time and deficit) at the beginning (BPP) and after (APP) 6 weeks of the preparatory period. The results revealed that 20% of soccer players had a significant deficiency of 25(OH)D (<20 ng/ml) and 30% had insufficient 25(OH)D levels (between 20-30 ng/ml). Positive correlations were found between the training effect for the ∆COD (BPP -APP) (p=0.003) and ∆deficit (BPP-APP) (p=0.039). Significant differences were noticed for the ∆COD (m=0.60 [s]) and ∆deficit (m=0.56[s]) in the soccer players whose 25(OH)D concentration was <=30 ng/ml, and for the ∆COD (p=0.002) and ∆deficit (p=0.017) in the soccer players whose 25(OH)D concentration was >30 ng/ml. The training effect was significantly higher for the soccer players whose 25(OH)D concentration was above 30 ng/ml. Soccer players with higher 25(OH)D levels achieved superior results in the COD test and demonstrated better deficit outcomes, affirming the positive influence of 25(OH)D on muscle metabolism

    Keywords: Vitamin D, Soccer (football), Speed - strength qualities, Change of direction ability, Muscle

    Received: 25 Sep 2024; Accepted: 04 Nov 2024.

    Copyright: © 2024 Michalczyk, Kałuża, Zydek, Roczniok and Gołaś. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Małgorzata M. Michalczyk, Institute of Sport Sciences, Jerzy Kukuczka Academy of Physical Education in Katowice, Katowice, Poland

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.