Proceedings of the 12th International Conference on Kinanthropology. Sport and Quality of Life. 7. – 9. 11. 2019


Vitamin D status among youth soccer players; association with chronological age, maturity status, jumping and sprinting performance

Rok vydání: 2020


Purpose: Vitamin D is known to have a significant role in numerous body-system processes. Specifically, it has an impact on muscle functioning and, therefore sports performance. Chil-dren and adolescents have increased need for vitamin D because of its importance in growth and development, and it is evident that they are more susceptible to have vitamin D deficien-cy. Consequently, vitamin D status is particularly important issue in youth competitive sport. The aim of this study was to determine the prevalence of vitamin D deficiency/insuficiency (measured as 25(OH)D concentration), and the possible associations between vitamin D, with age, maturity status, sprinting- and jumping-performance among youth soccer players. Methods: The sample of participants in this research comprised 62 youth soccer players (age: 15.7 ± 2.2 years). They were divided into two categories according to 25(OH)D levels measured at the end of the winter season: group with inadequate levels of 25(OH)D (vitamin D deficiency/insuficiency [ 75 nmol/L]). Biological maturity status (maturity offset) was calculated from participants age and height by the following equation:<br />Maturity offset = −7.999994 + (0.0036124 × (age(yrs.) × height(cm)). Performance variables were 10 meters sprint test (S10m) and countermovement jump test (CMJ).<br />Results: Results showed relatively good 25(OH)D concentrations (78.32 ± 23.39 nmol/L), with prevalence of deficiency (< 50 nmol/L) in 8.06%, and insuficiency (50–75 nmol/L) in 46.77% athletes. Significant correlations were evidenced between the CMJ and 25(OH)D level (R = 0.27, p < 0.05), but chronological age was also correlated with CMJ (R = 0.64, p < 0.05). Further, higher chronological age was found in participants with suficient vitamin D levels (15.1 ± 2.4 vs. 16.4 ± 1.6 years; t-test = 2.43, p < 0.05). However, no significant as-sociation was evidenced between vitamin D and maturity status.<br />Conclusion: Vitamin D groups significantly differed by chronological age but not by maturity status, which collectively with correlation between CMJ and vitamin D status indicates that both vitamin D status and performance in youth soccer players is actually influenced by chronological age. Meanwhile, biological age doesn’t have a significant physiological influ-ence on vitamin D concentration, while some external factors (i.e. time spent outdoors, pa-rental control, sunscreen usage), should be considered important.

Klíčová slova

Vitamin D; age; maturity; jumping; sprinting; soccer


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