Recent evidence suggests that vitamin D may affect iron regulation and erythropoiesis by its influence on hepcidin as well as on erythroid precursors. For these reasons deficit of vitamin D may deteriorate iron status and increase the risk of anaemia. We aimed to investigate whether vitamin D deficiencies have an impact on iron status in normal and iron-deficient athletes. The study included 290 healthy subjects (175 males and 115 females), aged 15-34 years, representing volleyball, cycling, canoeing, rowing, hockey, taekwondo and badminton. Blood for analysis was withdrawn in different seasons.
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