Effects of vitamin D supplementation on haematological values and muscle recovery in elite male traditional rowers

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dc.contributor.authorMielgo Ayuso, Juan
dc.contributor.authorCalleja González, Julio
dc.contributor.authorUrdampilleta Otegui, Aritz
dc.contributor.authorLeón Guereño, Patxi
dc.contributor.authorCórdova Martínez, Alfredo
dc.contributor.authorCaballero García, Alberto
dc.contributor.authorFernández Lázaro, Diego
dc.date.accessioned2026-02-17T11:29:19Z
dc.date.available2026-02-17T11:29:19Z
dc.date.issued2018-12-12
dc.date.updated2026-02-17T11:29:19Z
dc.description.abstractDeficient levels of 25-hydroxyvitamin D (25(OH)D) (<30 ng/mL) may compromise health and athletic performance. Supplementation with oral vitamin D can favor the state of iron metabolism, and testosterone and cortisol as an indicator of muscle recovery of the athlete with a deficiency. The main aim of this study was to evaluate the influence of eight weeks of supplementation with 3000 IU/day of vitamin D on the hematological and iron metabolism profile, as well as on the analytical values of testosterone and cortisol on elite male traditional rowers. The secondary aim was to examine if serum 25(OH)D is a predictor of testosterone and cortisol levels. Thirty-six elite male rowers (27 ± 6 years) were assigned to one of the two groups randomly: 1) Control group (CG, n = 18, height: 181.05 ± 3.39 cm and body mass: 77.02 ± 7.55 kg), 2) Group treated with 3,000 IU of vitamin D3/day (VD3G, s = 18, height: 179.70 ± 9.07 cm and body mass: 76.19 ± 10.07 kg). The rowers were subjected to blood tests at the beginning of the study (T1) and after eight weeks of treatment (T2), for the analysis of hematological and hormonal values. Repeated-measures ANOVA with group factor (GC and GVD3) were used to examine if the interaction of the different values was the same or different between the groups throughout the study (time × group) after vitamin D3 treatment. To analyze if 25(OH)D was a good predictor of testosterone, cortisol, and testosterone/cortisol ratio a stepwise regression model was performed. Statistically significant and different increases were observed in the group-by-time interaction of 25(OH)D in VD3G in respect to CG during the study (p < 0.001; VD3G (T1: 26.24 ± 8.18 ng/mL vs. T2: 48.12 ± 10.88 ng/mL) vs CG (T1: 30.76 ± 6.95 ng/mL vs. T2: 35.14 ± 7.96 ng/mL). Likewise, significant differences between groups were observed throughout the study in the group-by-time interaction and changes of hemoglobin (GC: −2.89 ± 2.29% vs. VD3G: 0.71 ± 1.91%; p = 0.009), hematocrit (CG: −1.57 ± 2.49% vs. VD3G: 1.16 ± 1.81%; p = 0.019) and transferrin (CG: 0.67 ± 4.88% vs. VD3G: 6.51 ± 4.36%; p = 0.007). However, no differences between groups were observed in the group-by-time interaction of the hormonal parameters (p > 0.05). Regression multivariate analysis showed that cortisol and testosterone levels were associated with 25(OH)D levels (p < 0.05). Oral supplementation with 3000 IU/day of vitamin D3 during eight weeks showed to be sufficient to prevent a decline in hematological levels of hemoglobin and hematocrit, and improve transferrin of 25(OH)D levels. However, although it was not sufficient to enhance muscle recovery observed by testosterone and cortisol responses, it was observed that serum 25(OH)D levels could be a predictor of anabolic and catabolic hormones.en
dc.identifier.citationMielgo-Ayuso, J., Calleja-González, J., Urdampilleta, A., León-Guereño, P., Córdova, A., Caballero-García, A., & Fernandez-Lázaro, D. (2018). Effects of vitamin D supplementation on haematological values and muscle recovery in elite male traditional rowers. Nutrients, 10(12). https://doi.org/10.3390/NU10121968
dc.identifier.doi10.3390/NU10121968
dc.identifier.eissn2072-6643
dc.identifier.urihttps://hdl.handle.net/20.500.14454/5125
dc.language.isoeng
dc.publisherMDPI AG
dc.rights© 2018 by the authors
dc.subject.otherStrength-endurance
dc.subject.otherVitamin D
dc.subject.otherHemoglobin
dc.subject.otherHematocrit
dc.subject.otherRecovery
dc.subject.otherTestosterone
dc.subject.otherCortisol
dc.titleEffects of vitamin D supplementation on haematological values and muscle recovery in elite male traditional rowersen
dc.typejournal article
dcterms.accessRightsopen access
oaire.citation.issue12
oaire.citation.titleNutrients
oaire.citation.volume10
oaire.licenseConditionhttps://creativecommons.org/licenses/by/4.0/
oaire.versionVoR
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