Eight-Week Vitamin D<sub>3</sub> Supplementation at 4000 IU/Day Was Not Associated with Further Improvements in Speed or Power Performance in Professional Female Soccer Players: A Randomized Controlled Trial
Michalczyk MM, Gepfert M, Roczniok R, Zydek G
Nutrients · 1 cita
Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación independiente
Según la declaración de financiación del texto completo.
Publicación
- Publicado
- 2026-07-28 · Nutrients · vol. 18 · número 15 · pág. 2460
- Editorial
- Multidisciplinary Digital Publishing Institute
- Citado
- 1 cita · más que el 95% de estudios similares · 4.5× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 38 trabajos
- Acceso
- Acceso abierto (revista) · CC-BY
- Áreas de investigación
- Vitamin D Research Studies · Sports Performance and Training · Exercise and Physiological Responses
- Palabras clave
- vitamin D3 supplementation, vitamin D status, female soccer players, sprint performance, countermovement jump, muscle power, 25-hydroxyvitamin D, 1,25-dihydroxyvitamin D, hematological parameters, professional athletes, vitamin D deficiency
- MeSH
- humans, vitamin d deficiency, cholecalciferol, vitamin d, double-blind method, soccer, dietary supplements, adult, female, muscle strength, athletic performance, young adult, athletes
4 autores
- Małgorzata Magdalena Michalczyk🇵🇱 · autor de correspondenciaAkademii Wychowania Fizycznego im. Jerzego Kukuczki w Katowicach
- Mariola Gepfert🇵🇱Akademii Wychowania Fizycznego im. Jerzego Kukuczki w Katowicach
- Robert Roczniok🇵🇱Akademii Wychowania Fizycznego im. Jerzego Kukuczki w Katowicach
- Grzegorz Zydek🇵🇱Akademii Wychowania Fizycznego im. Jerzego Kukuczki w Katowicach
Resumen
El texto original del estudio, en el idioma en que se publicó.
Background: Vitamin D is involved in musculoskeletal function, but evidence that supplementation improves athletic performance remains inconsistent, particularly in athletes with sufficient baseline vitamin D status. Methods: In this double-blind randomized controlled trial, 18 professional female soccer players were randomized during the autumn preparatory period (August-September) to receive vitamin D3 (4000 IU/day; n = 9) or placebo (n = 9) for eight weeks. Outcomes included total serum 25-hydroxyvitamin D [25(OH)D] and 1,25-dihydroxyvitamin D [1,25(OH)2D] concentrations, hematological variables, RAST total sprint time, 5- and 30-m sprint performance, and countermovement-jump outcomes. Results: At baseline, after summer exposure, 25% of participants had insufficient or deficient 25(OH)D concentrations (≤30 ng/mL). The remaining cohort (75%) had sufficient 25(OH)D concentrations (>30 ng/mL). After eight weeks, no statistically significant between-group differences were observed in vitamin D metabolites, hematological variables, or performance outcomes (Δ25(OH)D: SG +12.4 ± 8.2 ng/mL vs. PG +3.1 ± 6.5 ng/mL; p = 0.12). RAST total sprint time (p = 0.001) and 30-m sprint performance (p = 0.005) improved over time. Conclusions: Vitamin D3 supplementation at 4000 IU/day for eight weeks was not associated with additional improvements in muscle strength, sprint performance, or countermovement-jump outcomes compared with placebo. Because most participants had sufficient baseline 25(OH)D concentrations, larger trials in female athletes with confirmed vitamin D insufficiency or deficiency are needed to determine whether individualized supplementation or longer intervention periods provide additional physiological or performance-related benefits. The trial was retrospectively registered at ClinicalTrials.gov (NCT07641075) on 8 June 2026.
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