What to watch with VDR and Sport?

The question about VDR (Vitamin D Receptor) and sport is scientifically relevant, but the provided context contains no specific data on this topic. Generally, VDR plays a key role in calcium metabolism, muscle contraction, and immune regulation. Genetic variants in the VDR gene (e.g., rs2228570, rs1544410) can affect vitamin D binding and signaling, potentially influencing muscle strength, recovery, and injury risk. Some studies show associations between VDR polymorphisms and athletic performance, especially in strength and endurance athletes. However, the evidence is moderate and insufficient for personalized training recommendations. A vitamin D home test (like MyBody-X's) only measures current blood levels, not VDR genetics. To assess VDR status, a dedicated DNA test is needed. Importantly, low vitamin D levels can impair performance regardless of genotype. Supplementation should be based on blood values and medical advice, as overdosing is harmful. The value of a single self-test is limited; it does not replace clinical diagnosis.