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This study aimed to investigate the effect of vitamin D 3  supplementation at a dose of 4,000 IU/day for 6 weeks on serum levels of: 25‐hydroxyvitamin D [25(OH)D], bone turnover [osteocalcin and carboxy‐terminal telopeptides of crosslinks of type I collagen (CTx‐I)], and muscle damage [lactate dehydrogenase (LDH) and creatine kinase (CK)] in middle adolescent (15‐18 years) and late‐adolescent to early adulthood (19‐30 years) female basketball players with inadequate vitamin D status. Participants (N=24) were randomly assigned in a double‐blind manner into a vitamin D or placebo group. Data were analyzed using separate 2×2x2 mixed ANOVAs with one within‐subjects factor (time) and two between‐subjects factors (condition and age). When a significant interaction was observed, the intra‐group changes were assessed using paired t tests and Hedge's  g . Paired t‐tests comparing intra‐group changes in the vitamin D condition revealed a non‐significant  large  improvement in 25(OH)D ( p  = 0.06; g = 0.86), non‐significant  small  decreases in CTx‐I ( p  = 0.13;  g  = −0.22) and CK ( p  = 0.07;  g  = −0.26), as well as a significant  moderate  decrease in LDH ( p  = 0.004;  g  = −0.74). Paired t‐tests comparing intra‐group changes in the placebo condition revealed a significant  moderate  decline in 25(OH)D ( p  &lt;0.001;  g  = −0.77), as well as significant  small  increases in CTx‐I ( p  = 0.04;  g  = 0.47) and CK ( p  = 0.04;  g  = 0.36). Vitamin D 3  supplementation at 4,000 IU/day could be effective in reducing bone resorption and muscle damage in female basketball players with inadequate baseline vitamin D, irrespective of age.

Vitamin D 3 supplementation reduces serum markers of bone resorption and muscle damage in female basketball players with vitamin D inadequacy