Abstract
Searching for potential relations between changes in 25(OH)D concentration and in physical fitness is an interesting scientific topic. Thus, the main purpose of this study was to investigate the changes in serum concentrations of 25(OH)D in young football players in conjunction with indicators determining bone resorption and physical fitness. A total of 35 young soccer players were tested during the autumn competition period. Biochemical analysis of blood, aerobic capacity, running speed and power tests (Wingate test, squat jump, counter movement jump) were carried out at the beginning and at the end of the competition period. Significant decrements in concentration of 25(OH)D from 33.9 ± 5.87 to 23.7 ± 5.58 ng/mL were noted after the analyzed competition period. There were no significant changes in aerobic capacity along the competition period. Significant improvements were observed in 10 m sprint, 30 m sprint (p < 0.001), maximal power (p = 0.011) and total work capacity (p = 0.024). We found that the effect of changes in the players’ physical fitness does not occur in relation to 25 OH(D) concentration but occurs when these changes are analyzed as a function of the duration of the observation period. Changes in physical fitness of soccer players are determined by other factors then 25(OH)D concentration.
Highlights
The multidirectional impact of vitamin D on the human body has been widely investigated
By analyzing the initial 25(OH)D concentration in the test subjects before the research project and its greater or lesser drop after the project, we found that the effect of changes in the physical fitness of players does not occur in relation to subgroups but occurs when these changes are analyzed as a function of the duration of observation
Seasonal changes in vitamin D concentrations are linked to its endogenous production and depend on many factors related to the time of day, time of year, latitude and the large amount of melanin in the skin, since it binds UV rays [32]
Summary
The multidirectional impact of vitamin D on the human body has been widely investigated. The need to maintain an optimal level of 25(OH)D in athletes, including professional footballers and people with little physical activity during and immediately after winter in Northern European countries was suggested by Kopeć et al [2], Solarz et al [3] and Bezuglow et al [4] in their studies. These authors diagnosed a significantly lower concentration of 25(OH)D in athletes at that time compared to the summer period.
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