Circulating total 25(OH)D and calculated free 25(OH)D in
professional academy footballers at a northerly latitude in the UK

Simon D. Bowles; Subhashis Basu; Mayur K. Ranchordas; Trevor Simper; Anthony Lynn

doi:10.5114/biolsport.2024.131822

eISSN: 2083-1862
ISSN: 0860-021X

Biology of Sport

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2/2024
vol. 41

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abstract:

Original paper

Circulating total 25(OH)D and calculated free 25(OH)D in professional academy footballers at a northerly latitude in the UK

Simon D. Bowles

¹

,

Subhashis Basu

²

,

Mayur K. Ranchordas

^{3, 4}

,

Trevor Simper

¹

,

Anthony Lynn

^{1, 4}

Food Group, Sheffield Business School, Sheffield Hallam University, Sheffield, UK
Sheffield Teaching Hospitals NHS Trust, Sheffield, UK
Academy of Sport & Physical Activity, Faculty of Health & Wellbeing, Sheffield Hallam University, Sheffield, UK
Advanced Wellbeing Research Centre, Sheffield Hallam University, UK

Biol Sport. 2024;41(2):201–208

DOI: https://doi.org/10.5114/biolsport.2024.131822

Online publish date: 2023/11/20

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There is limited data on the vitamin D status of UK-based professional academy footballers. Therefore, the objective of this study was to report total 25(OH)D, free 25(OH)D and free 1,25(OH)₂D at the end of the winter (March) and summer periods (October) in a cohort (n = 27) of professional academy footballers in northern England. Blood samples were collected to measure total 25(OH)D, parathyroid hormone, vitamin D binding protein, albumin and calcium. Free 25(OH)D and 1, 25(OH)₂D were calculated. Dietary vitamin D intake and retrospective summer sunlight exposure were also collected. At the end of winter, 2/27 (7.4%) players were vitamin D deficient (25(OH)D < 30 nmol/l) and 11/27 (40.7%) were insufficient (25(OH)D > 30 nmol/l < 50 nmol/l). By the end of summer, none were deficient but 3/14 (21.4%) were still insufficient. Median total 25(OH)D(82.2 nmol/l [IQR: 50.3–90.2] vs. 54.2 nmol/l [IQR: 36.8–71.9]; P = .02), free 25(OH)D (25.8 pmol/l [IQR: 15.1–33.1] vs. 13.2 pmol/l [IQR: 9.0–14.9]; P = .005) and free 1, 25(OH)2D (389 fmol/l [IQR: 209–594] vs. 212 fmol/l [IQR: 108–278]; P = .034) were significantly higher at the end of summer than the end of winter. At the end of winter, free 25(OH)D was lower (P = .003) in those vitamin D insufficient (8.8 pmol/l [IQR: 5.5–11.8]) vs. sufficient (13.7 pmol/l [IQR: 12.0 17.0]). There was a high prevalence of vitamin D insufficiency at the end of the winter. Free 25(OH)D was also lower at the winter timepoint and in players that were insufficient vs. sufficient.

keywords:

Circulating total 25(OH)D and calculated free 25(OH)D in professional academy footballers at a northerly latitude in the UK

Simon D. Bowles 1 , Subhashis Basu 2 , Mayur K. Ranchordas 3, 4 , Trevor Simper 1 , Anthony Lynn 1, 4

Total 25(OH)D, Free 25(OH)D, Free 1,25(OH)2D, Footballers

Simon D. Bowles

¹

,

Subhashis Basu

²

,

Mayur K. Ranchordas

^{3, 4}

,

Trevor Simper

¹

,

Anthony Lynn

^{1, 4}