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Vitamin d and athlete

Daniel J Owens, Jonathan C Y Tang, Warren J Bradley, S Andy Sparks, William D Fraser, James P Morton, Graeme L Close
PURPOSE: Supplementation with dietary forms of vitamin D is commonplace in clinical medicine, elite athletic cohorts and the general population, yet the response of all major vitamin D metabolites to high doses of vitamin D is poorly characterized. We aimed to identify the responses of all major vitamin D metabolites to moderate and high dose supplemental vitamin D3. METHODS: A repeated measures design was implemented in which 46 elite professional European athletes were block randomized based on their basal 25[OH]D concentration into two treatment groups...
October 13, 2016: Medicine and Science in Sports and Exercise
Jaroslaw Krzywanski, Tomasz Mikulski, Hubert Krysztofiak, Marcel Mlynczak, Ewa Gaczynska, Andrzej Ziemba
Vitamin D does not only influence the musculoskeletal health and mineral homeostasis but it also affects cardiovascular, endocrine, nervous, immune and mental functions, thus it is of considerable importance for both physically active people and elite athletes. However, vitamin D deficiency is common worldwide and results from inadequate endogenous skin synthesis (insufficient ultraviolet B exposure) and diet. To improve the vitamin D status elite athletes often travel to lower latitude during winter. The aim of the study was to evaluate the seasonal vitamin D status in Polish elite athletes according to the sun exposure and oral supplementation...
2016: PloS One
Carolina A Moreira, John P Bilezikian
CONTEXT: Stress fractures are repetitive use injuries in which recurrent strains lead to material fatigue and microarchitectural discontinuities. Stress fractures account for up to 20% of athletic injuries, more commonly sustained by women and in those who engage in track-and-field events. The pathogenesis of stress fractures is multifactorial. Although most stress fracture are reported among women who may experience menstrual disturbances, low body mass index, low energy intake and sometimes low bone mass, these individuals do not regularly seek endocrinological attention...
October 12, 2016: Journal of Clinical Endocrinology and Metabolism
Evelien Backx, Cindy van der Avoort, Michael Tieland, Kamiel Maase, Arie Kies, Luc van Loon, Lisette de Groot, Marco Mensink
Studies monitoring vitamin D status in athletes are seldom conducted for a period of 12 months or longer, thereby lacking insight into seasonal fluctuations. The objective of the cur-rent study was to identify seasonal changes in total 25-hydroxyvitamin D (25(OH)D) concen-tration throughout the year. Fifty-two, mainly Caucasian athletes with a sufficient 25(OH)D concentration (>75 nmol/L) in June were included in this study. Serum 25(OH)D concentra-tion was measured every three months (June, September, December, March, June)...
October 6, 2016: International Journal of Sport Nutrition and Exercise Metabolism
J J Todd, E M McSorley, L K Pourshahidi, S M Madigan, W Crowe, E J Laird, M Healy, A McNeilly, P J Magee
Vitamin D inadequacy [total 25(OH)D <50 nmol/L] is widespread in athletes. The biologically active metabolite, 1,25-dihydroxyvitamin D, may be involved in regulating inflammation although in vitro findings have not been consistently replicated in human intervention trials. This study, conducted at a latitude of 55°N, aimed to assess inflammatory biomarkers in Gaelic footballers before and after a wintertime vitamin D3 intervention. Samples from a 12-week double-blind, randomized, placebo-controlled trial, in which 42 Gaelic footballers received 3000 IU (75 μg) vitamin D3 daily or placebo via oral spray solutions, were analysed for a range of inflammatory biomarkers...
October 5, 2016: Scandinavian Journal of Medicine & Science in Sports
Pascal Edouard, Jean-Michel Serra, Marie Lafleur, Frédéric Depiesse
OBJECTIVE: Vitamin D works on many biological parameters, functions and pathophysiological phenomena, such as bone metabolism but also extra-osseous metabolism (muscular role immunomodulator, cardiac, infectious). In France, the prevalence of vitamin D deficiency is estimated between 36% and 79-81% based on a threshold set at 50nmol/L or 75nmol/L, respectively. Due to these effects, vitamin D seems necessary to the health of athletes. The objective of this study was to determine the vitamin D status of in athletics athletes, and to analyse the possibilities of a screening questionnaire of vitamin D deficiency...
September 2016: Annals of Physical and Rehabilitation Medicine
Joelle Leonie Flueck, Max Walter Schlaepfer, Claudio Perret
(1) BACKGROUND: studies with able-bodied athletes showed that performance might possibly be influenced by vitamin D status. Vitamin D seems to have a direct impact on neuromuscular function by docking on vitamin D receptors in the muscle tissue. Additionally, a high prevalence of vitamin D deficiency was shown not only in infants and in the elderly but also in healthy adults and spinal cord injured individuals. Therefore, the aim of our study was to investigate whether a vitamin D dose of 6000 IU daily over 12 weeks would be sufficient to increase vitamin D status in indoor wheelchair athletes to a normal or optimal vitamin D level and whether vitamin D deficiency is associated with an impairment in muscle performance in these individuals; (2) METHODS: vitamin D status was assessed in indoor elite wheelchair athletes in order to have a baseline measurement...
2016: Nutrients
André Brännström, Ji-Guo Yu, Per Jonsson, Torbjörn Åkerfeldt, Mats Stridsberg, Michael Svensson
The present work investigated serum vitamin D (25(OH)D) status in relation to bone and muscle qualities and functions in 19 female soccer players (13-16 years) resident at northern latitude with very low sun exposure (∼32-36 h/month) during winter season (late January to early March). Serum 25(OH)D, parathyroid hormone and bone turnover markers osteocalcin (OC) and beta carboxy-terminal collagen cross-links (β-Ctx), as well as body composition and muscle performance were examined. Hormones were tested using routine laboratory methods...
September 15, 2016: European Journal of Sport Science
Floris C Wardenaar, Ingrid Jm Ceelen, Jan-Willem Van Dijk, Roland Wj Hangelbroek, Lore Van Roy, Britte Van der Pouw, Jeanne Hm De Vries, Marco Mensink, Renger F Witkamp
The use of nutritional supplements is highly prevalent among athletes. In this cross-sectional study we assessed the prevalence of nutritional supplement use by a large group of Dutch competitive athletes in relation to dietary counselling. A total of 778 athletes (407 males and 371 females) completed a web-based questionnaire about the use of nutritional supplements. Log-binomial regression models were applied to estimate crude and adjusted prevalence ratios (PR) for the use of individual nutritional supplements in athletes receiving dietary counselling as compared to athletes not receiving dietary counselling...
September 6, 2016: International Journal of Sport Nutrition and Exercise Metabolism
A Dzedzej, W Ignatiuk, J Jaworska, T Grzywacz, P Lipińska, J Antosiewicz, A Korek, E Ziemann
Following acute physical activity, blood hepcidin concentration appears to increase in response to exercise-induced inflammation, but the long-term impact of exercise on hepcidin remains unclear. Here we investigated changes in hepcidin and the inflammation marker interleukin-6 to evaluate professional basketball players' response to a season of training and games. The analysis also included vitamin D (25(OH)D3) assessment, owing to its anti-inflammatory effects. Blood samples were collected for 14 players and 10 control non-athletes prior to and after the 8-month competitive season...
September 2016: Biology of Sport
Richard J Allison, Abdulaziz Farooq, Bruce Hamilton, Graeme Close, Mathew Wilson
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Jill A Parnell, Kristin P Wiens, Kelly A Erdman
Young athletes experience numerous dietary challenges including growth, training/competition, unhealthy food environments, and travel. The objective was to determine nutrient intakes and supplement use in pre-adolescent and adolescent Canadian athletes. Athletes (n = 187) aged 11-18 years completed an on-line 24-h food recall and dietary supplement questionnaire. Median energy intake (interquartile range) varied from 2159 kcal/day (1717-2437) in 11-13 years old females to 2905 kcal/day (2291-3483) in 14-18 years old males...
2016: Nutrients
Leslie N Silk, David A Greene, Michael K Baker, Caron B Jander
OBJECTIVES: Engagement in high volumes of physical activity coupled with energy restriction during periods of musculoskeletal development may compromise bone health. Jockeys limit caloric intakes on a weekly basis often from their mid-to-late teens. The aim of this study was to establish whether calcium and vitamin D supplementation would improve bone turnover markers (BTM) and non-weight bearing bone properties of young male jockeys. DESIGN: A six-month randomised, double-blinded, placebo-controlled trial with two groups of apprentice male jockeys was conducted...
August 9, 2016: Journal of Science and Medicine in Sport
Joshua Todd, Sharon Madigan, Kirsty Pourshahidi, Emeir McSorley, Eamon Laird, Martin Healy, Pamela Magee
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...
2016: Nutrients
Julien Louis, Laurie-Anne Marquet, Eve Tiollier, Stéphane Bermon, Christophe Hausswirth, Jeanick Brisswalter
PURPOSE: We investigated the effects of a 3-week dietary periodization on immunity and sleep in triathletes. METHODS: 21 triathletes were divided into two groups with different nutritional guidelines during a 3-week endurance training program including nine twice a day sessions with lowered (SL group) or maintained (CON group) glycogen availability during the overnight recovery period. In addition to performance tests, sleep was monitored every night. Systemic and mucosal immune parameters as well as the incidence of URTI were monitored every week of the training/nutrition protocol...
October 2016: European Journal of Applied Physiology
E M P Backx, M Tieland, K Maase, A K Kies, M Mensink, L J C van Loon, L C P G M de Groot
BACKGROUND/OBJECTIVES: To assess the prevalence of vitamin D deficiency in Dutch athletes and to define the required dosage of vitamin D3 supplementation to prevent vitamin D deficiency over the course of a year. SUBJECTS/METHODS: Blood samples were collected from 128 highly trained athletes to assess total 25(OH)D concentration. Of these 128 athletes, 54 male and 48 female athletes (18-32 years) were included in a randomized, double blind, dose-response study. Athletes with either a deficient (<50 nmol/l) or an insufficient (50-75 nmol/l) 25(OH)D concentration were randomly assigned to take 400, 1100 or 2200 IU vitamin D3 per day orally for 1 year...
September 2016: European Journal of Clinical Nutrition
Chien-Ming Chiang, Ahmed Ismaeel, Rachel B Griffis, Suzy Weems
The purpose of this systematic review of the literature was to investigate the effects of vitamin D supplementation on muscle strength in athletes. A computerized literature search of three databases (PubMed, Medline, and Scopus) was performed. Included in the review were randomized controlled trials, published in English, which measured serum vitamin D concentrations and muscle strength in healthy, athletic participants ages 18-45 years old. Quality was assessed using the PEDro scale.Five randomized controlled trials and one controlled trial were identified, and quality assessment showed five trials were of 'excellent quality' and one was of 'good quality...
June 28, 2016: Journal of Strength and Conditioning Research
Joshua J Todd, Emeir M McSorley, Kirsty Pourshahidi, Sharon M Madigan, Eamon Laird, Ruth R Weir, Martin Healy, Pamela J Magee
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Asako Maruyama-Nagao, Keishoku Sakuraba, Yoshio Suzuki
Vitamin D (VD) insufficiency is a concern, particularly among young females. The VD status shows seasonal variations, since it correlates with duration of sunlight exposure. VD insufficiency in indoor athletes is therefore suggested in winter. The aim of the present study was to determine seasonal variations in VD and bone status among indoor and outdoor female athletes. The prospective study was conducted in participants aged 20-22 years old. The participants comprised of 15 indoor and 15 outdoor athletes...
July 2016: Biomedical Reports
Marta Stachowicz, Anna Lebiedzińska
Sports training causes an increased load on the musculoskeletal, hormonal and immune system, which makes maintaining homeostasis in the organism more difficult. Maintaining metabolic balance in the athlete's body is important due to the necessity to obtain high physical fitness. One factor that facilitates optimization of health and increased endurance is a balanced diet. Proper nutrition enables provision of energy-giving and body-building substances as well as bioelements and vitamins, which influence metabolic processes and play regulatory functions...
2016: Postȩpy Higieny i Medycyny Doświadczalnej
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