The DOI matches its Crossref record; 10 of the 10 references it cites were found in a registry or an index.
Predictive Factors for Vitamin D Concentrations in Swiss Athletes: A Cross-sectional Study
Abstract
Vitamin D concentrations corresponding to 75 nmol/L 25(OH)D have been associated with maintained muscle function, growth and regeneration, optimal bone health and immunology in athletes. The objective of this study was to investigate the prevalence and predictors of insufficient 25(OH)D concentrations in athletes. Six hundred three Swiss athletes were assessed. 25(OH)D was analysed by high-performance liquid chromatography (HPLC). A standardized questionnaire was used to gather information about potential predictors for 25(OH)D concentrations; 50.5% showed insufficient 25(OH)D concentrations. Differences in predicted probability of insufficient 25(OH)D were found for those vitamin D supplemented (42%) versus not supplemented (52%), in those performing indoor (58%) versus outdoor sports (43%), and during the sun-deprived seasons of fall (49%), winter (70%) and spring (57%) compared with summer (17%). Higher BMI z-scores and age were associated with higher 25(OH)D concentrations. In conclusion, insufficient 25(OH)D concentrations were common among athletes especially at a younger age, among those not supplemented, in athletes who trained indoors, and during the sun-deprived seasons. Because the prevalence of insufficient 25(OH)D concentrations in this study was high, regular supplementation in athletes may be indicated, except perhaps during the summer season. Further research is needed to determine which 25(OH)D concentrations lead to optimal health and performance in athletes.
Overview
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
In the citing paper
“recent evidence suggests that youth winter sports athletes may be at increased risk of vitamin D deficiency”
From Key Nutritional Considerations for Youth Winter Sports Athletes to Optimize Growth, Maturation and Sporting Development (2021) · cites this paper as Zurcher et al., 2018
In the citing paper
“Indeed, performing training in winter months and indoors (typical of youth winter sports athletes) increases a youth athlete's risk of vitamin D deficiency [serum 25(OH)D <30 nmol·L−1; Zurcher et al., 2018].”
From Key Nutritional Considerations for Youth Winter Sports Athletes to Optimize Growth, Maturation and Sporting Development (2021) · cites this paper as Zurcher et al., 2018
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Citations
Cites
Medication Adherence: WHO Cares?
Brown, M. T., & Bussell, J. K. (2011) · Mayo Clinic Proceedings · doi:10.4065/mcp.2010.0575 · Cited by 1,928
Theodoratou, E., Tzoulaki, I., Zgaga, L., & Ioannidis, J. P. A. (2014) · BMJ · doi:10.1136/bmj.g2035 · Cited by 956
Prevalence and associations of 25-hydroxyvitamin D deficiency in US children: NHANES 2001–2004
Kumar, J., Muntner, P., Kaskel, F. J., Hailpern, S. M., & Melamed, M. L. (2009) · Pediatrics · doi:10.1542/peds.2009-0051 · Cited by 621
Prevalence of vitamin D inadequacy in athletes: a systematic-review and meta-analysis
Farrokhyar, F., Tabasinejad, R., Dao, D., Peterson, D., Ayeni, O. R., Hadioonzadeh, R., & Bhandari, M. (2015) · Sports Medicine · doi:10.1007/s40279-014-0267-6 · Cited by 249
Tomlinson, P. B., Joseph, C., & Angioi, M. (2015) · Journal of Science and Medicine in Sport · doi:10.1016/j.jsams.2014.07.022 · Cited by 169
Bone Health in Athletes: The Role of Exercise, Nutrition, and Hormones
Goolsby, M. A., & Boniquit, N. (2017) · Sports Health: A Multidisciplinary Approach · doi:10.1177/1941738116677732 · Cited by 136 · cited 1×
“In athletes, circulating 25(OH)D has been associated with maintained muscle function including improvements in muscle contractions, enhanced growth and regeneration following muscle damage, and optimal bone health [7, 17, 43, 48, 56].”
InfluentialSports Health Benefits of Vitamin, D
Shuler, F. D., Wingate, M. K., Moore, G. H., & Giangarra, C. (2012) · Sports Health A Multidisciplinary Approach · doi:10.1177/1941738112461621 · Cited by 127
Muscular effects of vitamin D in young athletes and non-athletes and in the elderly
Koundourakis, N. E., Avgoustinaki, P. D., Malliaraki, N., & Margioris, A. N. (2016) · Hormones · doi:10.14310/horm.2002.1705 · Cited by 109
Vitamin D and the athlete: emerging insights
Owens, D. J., Fraser, W. D., & Close, G. L. (2015) · European Journal of Sport Science · doi:10.1080/17461391.2014.944223 · Cited by 81
Self-citationSeasonal variations in vitamin D status in indoor and outdoor female athletes
MARUYAMA-NAGAO, A., SAKURABA, K., & SUZUKI, Y. (2016) · Biomedical Reports · doi:10.3892/br.2016.671 · Cited by 44
Cited by
Bone Health in Athletes: The Role of Exercise, Nutrition, and Hormones
Goolsby, M. A., & Boniquit, N. (2017) · Sports Health: A Multidisciplinary Approach · doi:10.1177/1941738116677732 · Cited by 136
Impact of Vitamin D on Physical Efficiency and Exercise Performance—A Review
Wiciński, M., Adamkiewicz, D., Adamkiewicz, M., Śniegocki, M., Podhorecka, M., Szychta, P., & Malinowski, B. (2019) · Nutrients · doi:10.3390/nu11112826 · Cited by 84
Hannon, M. P., Flueck, J. L., Gremeaux, V., Place, N., Kayser, B., & Donnelly, C. (2021) · Frontiers in Sports and Active Living · doi:10.3389/fspor.2021.599118 · Cited by 23
Metadata
- Authors
- Zürcher, S., Quadri, A., Huber, A., Thomas, L., Close, G., Brunner, S., Noack, P., Gojanovic, B., & Kriemler, S.
- Affiliations
- Epidemiology, Biostatistics and Prevention Institute, University of Zürich, Zürich, Switzerland
- Spital Bulach, Internal Medicine, Bulach, Switzerland
- Kantonsspital Aarau, Labaratory Medicine, Aarau, Switzerland
- Klinikum der Johann-Wolfgang-Goethe Universität, Central laboratory for Clinical Chemistry and Hematology, Frankfurt am Main, Germany
- LJMU, Sports Science, Liverpool, United Kingdom of Great Britain and Northern Ireland
- Medbase Abtwil, Swiss Olympic Medical Center, Abtwil, Switzerland
- Hopital de la Tour, Swiss Olympic Medical Center, Meyrin, Switzerland
- Venue
- Sports Medicine International Open
- Publisher
- Georg Thieme Verlag KG
- Published
- 2018-09
- Volume
- 02
- Issue
- 05
- Pages
- E148-E156
- ISSN
- 2367-1890
- Cited by
- 6
- References
- 10
- Language
- en
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
Data sources
Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
