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Article

Vitamin D Status and Supplementation Practices in Elite Irish Athletes: An Update from 2010/2011

1
Northern Ireland Centre for Food and Health, University of Ulster, Coleraine, Londonderry BT52 1SA, Northern Ireland, UK
2
Irish Institute of Sport, Sports Campus Ireland, Abbotstown, Dublin 15, Republic of Ireland
3
School of Biochemistry and Immunology, Trinity College Dublin, Dublin 2, Republic of Ireland
4
Department of Biochemistry, Central Pathology Laboratory, St. James’s Hospital, Dublin 8, Republic of Ireland
*
Author to whom correspondence should be addressed.
Nutrients 2016, 8(8), 485; https://doi.org/10.3390/nu8080485
Received: 24 May 2016 / Revised: 3 August 2016 / Accepted: 3 August 2016 / Published: 9 August 2016
(This article belongs to the Special Issue Nutrition, Health and Athletic Performance)
Vitamin D deficiency is a global health concern that is prevalent in Ireland. The vitamin D status of elite Irish athletes following implementation of a revised supplementation policy in 2010/2011 has not been explored to date. This study aimed to assess the vitamin D status of elite Irish athletes participating in high-profile sports and establish if equatorial travel, supplementation and/or sunbed use predict vitamin D status. Across Ireland, blood samples (n = 92) were obtained from cricketers (n = 28), boxers (n = 21) and women’s rugby sevens players (n = 43) between November 2013 and April 2015. Total 25-hydroxyvitamin D (25(OH)D) concentrations were quantified using LC-MS/MS. Parathyroid hormone and adjusted calcium concentrations were measured by clinical biochemistry. Athletes completed a questionnaire that queried equatorial travel, supplementation and sunbed use. Vitamin D sufficiency (25(OH)D >50 nmol/L) was evident in 86% of athletes. Insufficiency (31–49 nmol/L) and deficiency (<30 nmol/L) was present in only 12% and 2% of athletes respectively. On average, athletes from all sport disciplines were vitamin D sufficient and 25% reported vitamin D supplementation which was a significant positive predictor of vitamin D status, (OR 4.31; 95% CI 1.18–15.75; p = 0.027). Equatorial travel and sun bed use were reported in 47% and 16% of athletes respectively however these factors did not predict vitamin D status (both p > 0.05). Although different cohorts were assessed, the overall prevalence of vitamin D insufficiency/deficiency was 55% in 2010/2011 compared with only 14% in 2013/2015. Targeted supplementation is highly effective in optimising vitamin D status, negating the need for blanket-supplementation in elite cohorts. View Full-Text
Keywords: Elite athletes; vitamin D; supplementation Elite athletes; vitamin D; supplementation
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MDPI and ACS Style

Todd, J.; Madigan, S.; Pourshahidi, K.; McSorley, E.; Laird, E.; Healy, M.; Magee, P. Vitamin D Status and Supplementation Practices in Elite Irish Athletes: An Update from 2010/2011. Nutrients 2016, 8, 485. https://doi.org/10.3390/nu8080485

AMA Style

Todd J, Madigan S, Pourshahidi K, McSorley E, Laird E, Healy M, Magee P. Vitamin D Status and Supplementation Practices in Elite Irish Athletes: An Update from 2010/2011. Nutrients. 2016; 8(8):485. https://doi.org/10.3390/nu8080485

Chicago/Turabian Style

Todd, Joshua, Sharon Madigan, Kirsty Pourshahidi, Emeir McSorley, Eamon Laird, Martin Healy, and Pamela Magee. 2016. "Vitamin D Status and Supplementation Practices in Elite Irish Athletes: An Update from 2010/2011" Nutrients 8, no. 8: 485. https://doi.org/10.3390/nu8080485

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