An Evaluation of the Levels of Vitamin D and Bone Turnover Markers After the Summer and Winter Periods in Polish Professional Soccer Players
Open accessAbstract
Vitamin D is synthesised in the skin during exposure to sunlight. The fundamental roles of vitamin D are the regulation of calcium and phosphate metabolism and bone mineralisation. Low vitamin D levels in athletes may adversely affect their exercise capabilities. The aim of our study was to investigate changes in serum levels of 25(OH)D3, calcium and bone turnover markers in football players in two training periods differing in the exposure to sunlight (after the summer period and after the winter period). We investigated 24 Polish professional soccer players. Serum levels of the following parameters were determined: 25(OH)D3, calcium, osteocalcin (OC), parathormone (PTH), procollagen type I N - terminal peptide (P1NP), and beta - CrossLaps (beta - CTx). We showed significantly higher levels of 25(OH)D3 and calcium and lower levels of PTH after the summer period versus the winter period. No significant differences in the levels of bone turnover markers were found. Furthermore, we did not observe any significant correlations between the levels of 25(OH)D3 and other parameters. Normal levels of 25(OH)D3 were observed in 50% of the players after the summer period and only in 16.7% of the players after the winter period. It is justified to measure the levels of 25(OH)D3, calcium and PTH in soccer players, especially after the winter period, when the exposure to sunlight is limited.
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A significantly lower level of 25(OH)D in players during winter compared with summer has been found.
“A significantly lower level of 25(OH)D in players during winter compared with summer has been found [29].”
From Influence of Sunlight and Oral D3 Supplementation on Serum 25(OH)D Concentration and Exercise Performance in Elite Soccer Players (2020) · cites this paper as [29]
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Cites
Bischoff-Ferrari, H. A., Dietrich, T., Orav, E. J., Hu, F. B., Zhang, Y., Karlson, E. W., & Dawson-Hughes, B. (2004) · The American Journal of Clinical Nutrition · doi:10.1093/ajcn/80.3.752 · Cited by 930 · see citing works
Vitamin D Status Predicts Physical Performance and Its Decline in Older Persons
Wicherts, I. S., van Schoor, N. M., Boeke, A. J. P., Visser, M., Deeg, D. J. H., Smit, J., Knol, D. L., & Lips, P. (2007) · The Journal of Clinical Endocrinology & Metabolism · doi:10.1210/jc.2006-1525 · Cited by 606 · see citing works
Vitamin D Receptor Expression in Human Muscle Tissue Decreases with Age
Bischoff-Ferrari, H., Borchers, M., Gudat, F., Dürmüller, U., Stähelin, H., & Dick, W. (2004) · Journal of Bone and Mineral Research · doi:10.1359/jbmr.2004.19.2.265 · Cited by 585 · see citing works
Flagged first, then by citations
Research works printed but not linked: 24
- Bischoff HA Stähelin HB Urscheler N Ehrsam R Vonthein R Perrig-Chiello P Tyndall A Theiler R Muscle strength in the elderly: its relation to vitamin D metabolites Arch Phys Med Rehabil 1999 80 54 8 9915372
- Bolland MJ Grey A Cundy T Reid IR Defining vitamin D deficiency N Z Med J 2007 120 U2760 17972977
- Cannell JJ Hollis BW Sorenson MB Taft TN Anderson JJ Athletic performance and vitamin D Med Sci Sport Exer 2009 41 1102 1110 19346976
- Close GL Leckey J Patterson M Bradley W Owens DJ Fraser WD Morton JP The effects of vitamin D3 supplementation on serum total 25[OH]D concentration and physical performance: a randomised dose - response study Br J Sports Med 10.1136/bjsports-2012-091735 2013 [Epub ahead of print] 23410885 · DOI · Paper page
- Galan F Ribas J Sánchez - Martinez PM Calero T Sánchez AB Muñoz A Serum 25 - hydroxyvitamin D in early autumn to ensure vitamin D sufficiency in mid - winter in professional football players Clin Nutr 2012 31 132 136 21843910
- Halliday TM Peterson NJ Thomas JJ Kleppinger K Hollis BW Larson - Meyer DE Vitamin D status relative to diet, lifestyle, injury, and illness in college athletes Med Sci Sports Exerc 2011 43 335 343 20543748
- Hamilton B Vitamin D and human skeletal muscle Scand J Med Sci Sports 2010 20 182 190 19807897 PMC2860762
- Holick MF Vitamin D deficiency New Engl J Med 2007 357 266 281 17634462
- Holick MF Binkley NC Bischoff - Ferrari HA Gordon CM Hanley DA Heaney RP Murad MH Weaver CM Endocrine Society Evaluation, treatment, and prevention of vitamin D deficiency: an Endocrine Society clinical practice guideline J Clin Endocrinol Metab 2011 96 1911 1930 21646368
- Houston DK Cesari M Ferrucci L Cherubini A Maggio D Bartali B Johnson MA Schwartz GG Kritchevsky SB Association between vitamin D status and physical performance: The InCHIANTI Study J Gerontol A Biol Sci Med Sci 2007 62 440 446 17452740 PMC2645652
- Institutes of Medicine Dietary reference intakes for calcium and vitamin D The National Academy Press Washington, D.C. 2011
- Knaysi GA Crikelair GF Cosman B The role of nines: its history and accuracy Plast Reconstr Surg 1968 41 560 563 5654897
- Lehtonen - Veromaa M Möttönen T Irjala K Kärkkäinen M Lamberg-Allardt C Hakola P Viikari J Vitamin D intake is low and hypovitaminosis D common in healthy 9- to 15-year-old Finnish girls Eur J Clin Nutr 1999 53 746 751 10509773
- Lombardi G Colombini A Freschi M Tavana R Banfi G Seasonal variation of bone turnover markers in top-level female skiers Eur J Appl Physiol 2011 111 433 440 20878421
- Lovell G Vitamin D status of females in an elite gymnastics program Clin J Sport Med 2008 18 159 16 18332692
- Maïmoun L Sultan C Effect of physical activity on calcium homeostasis and calciotropic hormones: a review Calcif Tissue Int 2009 85 277 286 19760298
- Maïmoun L Sultan C Effects of physical activity on bone remodeling Metabolism 2011 60 373 388 20359721
- Morton JP Iqbal Z Drust B Burgess D Close GL Brukner PD Seasonal variation in vitamin D status in professional soccer players of the English Premier League Appl Physiol Nutr Metab 2012 37 798 802 22554144
- Mowe M Haug E Bohmer T Low serum calcidiol concentration in older adults with reduced muscular function J Am Geriatr Soc 1999 47 220 226 9988294
- Vieth R Why the minimum desirable serum 25 - hydroxyvitamin D level should be 75 nmol/L (30 ng/ml) Best Pract Res Clin Endocrinol Metab 2011 25 681 691 21872808
- Visser M Deeg D Lips P Low Vitamin D and high parathyroid hormone levels asdeterminants of loss of muscle strength and muscle mass (Sarcopenia): The Longitudinal Aging Study Amsterdam J Clin Endocr Metab 2003 88 5766 5772 14671166
- Willis KS Peterson NJ Larson – Meyer DE Should we be concerned about the vitamin D status of athletes? Int J Sport Nutr Exerc Metab 2008 18 204 224 18458363
- Wolman R Wyon MA Koutedakis Y Nevill AM Eastell R Allen N Vitamin D status in professional ballet dancers: Winter vs. summer J Sci Med Sport 2013 S1440-2440(12)01139-5 23379989
- Zofkova I Hill M Long-term 1,25(OH)2 vitamin D therapy increases bone mineral density in osteopenic women. Comparison with the effect of plain vitamin D Aging Clin Exp Res 2007 19 472 477 18172369
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Michalczyk, M. M., Gołaś, A., Maszczyk, A., Kaczka, P., & Zając, A. (2020) · Nutrients · doi:10.3390/nu12051311 · Cited by 39 · see citing works
- Authors
- Kopeć, A., Solarz, K., Majda, F., Słowińska-Lisowska, M., & Mędraś, M.
- Affiliations
- Wroclaw University of Health and Sport Sciences (PL)
- 4. Wojskowy Szpital Kliniczny z Polikliniką (PL)
- Corresponding author
- Kopeć, Aleksandra
- Venue
- Journal of Human Kinetics
- Publisher
- Termedia Sp. z.o.o.
- Published
- 2013-09-01
- Volume
- 38
- Pages
- 135-140
- ISSN
- 1640-5544 (ISSN-L)
- 1899-7562
- PMC
- PMC3827761
- OpenAlex
- W2008663512
- Cited by
- 55
- References
- 3
- Citations by year
- 2026: 1 · 2025: 5 · 2024: 2 · 2023: 3 · 2022: 3 · 2021: 4 · 2020: 6 · 2019: 6 · 2018: 1 · 2017: 10 · 2016: 9 · 2014: 5
- FWCI
- 3.16
- Type
- journal article
- Language
- en
- Open access
- diamond
- doi.org
- Licence
- cc-by
- Locations
- Journal of Human Kinetics (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Pathology and Forensic Medicine › Vitamin D Research Studies
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Bone health and osteoporosis research
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
- Keywords
- vitamin D, 25-hydroxyvitamin D3, bone turnover markers, professional football players, sun exposure, seasonal variation, serum calcium, parathyroid hormone, osteocalcin, P1NP, C-terminal telopeptide of type I collagen, bone mineralization, athletes
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