scholarly journals Seasonal variation in vitamin D status in professional soccer players of French second League

2013 ◽  
Vol 56 ◽  
pp. e212-e213 ◽  
Author(s):  
R. Jallageas ◽  
X. Roy ◽  
J. Bordes ◽  
J.C. Daviet ◽  
J.Y. Salle ◽  
...  
Keyword(s):  
Vitamin D ◽  
Seasonal Variation ◽  
Soccer Players ◽  
Vitamin D Status ◽  
Professional Soccer

Seasonal variation in vitamin D status in professional soccer players of the English Premier League

2012 ◽  
Vol 37 (4) ◽  
pp. 798-802 ◽  
Author(s):  
James P. Morton ◽  
Zafar Iqbal ◽  
Barry Drust ◽  
Darren Burgess ◽  
Graeme L. Close ◽  
...  
Keyword(s):  
Vitamin D ◽  
Seasonal Variation ◽  
Muscle Function ◽  
Soccer Players ◽  
Vitamin D Status ◽  
Hydroxyvitamin D ◽  
Professional Soccer ◽  
Premier League ◽  
25 Hydroxyvitamin D ◽  
English Premier League

The prevalence of seasonal variation in vitamin D status was examined in 20 FA Premier League soccer players residing at a latitude of 53°N. Serum 25-hydroxyvitamin D (25(OH)D) levels decreased (P < 0.001) between August (104.4 ± 21.1 nmol·L–1, range 68–151) and December (51.0 ± 19.0 nmol·L–1, range 22–86), such that levels for 65% of the sample were insufficient (<50 nmol·L–1) in winter. Strategies to augment vitamin D3 availability may therefore be advantageous for UK soccer players so as to maintain muscle function.

scholarly journals Vitamin D Status and Seasonal Variation among Danish Children and Adults: A Descriptive Study

Nutrients ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1801 ◽  
Author(s):  
Louise Hansen ◽  
Anne Tjønneland ◽  
Brian Køster ◽  
Christine Brot ◽  
Rikke Andersen ◽  
...  
Keyword(s):  
Vitamin D ◽  
Seasonal Variation ◽  
Vitamin D Status ◽  
Hydroxyvitamin D ◽  
Supplement Use ◽  
Wide Range ◽  
Adults And Children ◽  
25 Hydroxyvitamin D ◽  
Vitamin D Supplement ◽  
Very High

The aim of the present study was to describe vitamin D status and seasonal variation in the general Danish population. In this study, 3092 persons aged 2 to 69 years (2565 adults, 527 children) had blood drawn twice (spring and autumn) between 2012 and 2014. A sub-sample of participants had blood samples taken monthly over a year. Serum 25-hydroxyvitamin D (25(OH)D) concentrations were measured by liquid chromatography mass spectrometry, and information on supplement use was assessed from questionnaires. Seasonal variations in 25(OH)D concentrations were evaluated graphically and descriptively, and status according to age, sex, and supplement use was described. It was found that 86% of both adults and children were vitamin D-sufficient in either spring and or/autumn; however, many had a spring concentration below 50 nmol/L. A wide range of 25(OH)D concentrations were found in spring and autumn, with very low and very high values in both seasons. Among adults, women in general had higher median 25(OH)D concentrations than men. Furthermore, vitamin D supplement use was substantial and affected the median concentrations markedly, more so during spring than autumn. Seasonal variation was thus found to be substantial, and bi-seasonal measurements are vital in order to capture the sizable fluctuations in vitamin D status in this Nordic population.

scholarly journals Nutrihealth Study: Seasonal Variation in Vitamin D Status Among the Slovenian Adult and Elderly Population

Nutrients ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1838 ◽  
Author(s):  
Maša Hribar ◽  
Hristo Hristov ◽  
Matej Gregorič ◽  
Urška Blaznik ◽  
Katja Zaletel ◽  
...  
Keyword(s):  
Vitamin D ◽  
Seasonal Variation ◽  
Vitamin D Deficiency ◽  
Elderly Population ◽  
Sun Exposure ◽  
Epidemiological Data ◽  
The Elderly ◽  
Vitamin D Insufficiency ◽  
Ultraviolet B ◽  
Vitamin D Status

Several studies conducted around the world showed substantial vitamin D insufficiency and deficiency among different population groups. Sources of vitamin D in the human body include ultraviolet B (UVB)-light-induced biosynthesis and dietary intake, but people’s diets are often poor in vitamin D. Furthermore, in many regions, sun exposure and the intensity of UVB irradiation during wintertime are not sufficient for vitamin D biosynthesis. In Slovenia, epidemiological data about vitamin D status in the population were investigated through a national Nutrihealth study—an extension to the national dietary survey SI.Menu (2017/18). The study was conducted on a representative sample of 125 adult (18–64 years) and 155 elderly (65–74 years old) subjects, enrolled in the study in different seasons. Their vitamin D status was determined by measuring the serum 25-hydroxy-vitamin D (25(OH)D) concentration. Thresholds for vitamin D deficiency and insufficiency were 25(OH)D levels below 30 and 50 nmol/L, respectively. Altogether, 24.9% of the adults and 23.5% of the elderly were found to be vitamin D deficient, while an insufficient status was found in 58.2% and 62.9%, respectively. A particularly concerning situation was observed during extended wintertime (November–April); vitamin D deficiency was found in 40.8% and 34.6%, and insufficient serum 25(OH)D levels were observed in 81.6% and 78.8%, respectively. The results of the study showed high seasonal variation in serum 25(OH)D levels in both the adult and elderly population, with deficiency being especially pronounced during wintertime. The prevalence of this deficiency in Slovenia is among the highest in Europe and poses a possible public health risk that needs to be addressed with appropriate recommendations and/or policy interventions.

scholarly journals Reciprocal seasonal variation in vitamin D status and tuberculosis notifications in Cape Town, South Africa

2011 ◽  
Vol 108 (47) ◽  
pp. 19013-19017 ◽  
Author(s):  
A. R. Martineau ◽  
S. Nhamoyebonde ◽  
T. Oni ◽  
M. X. Rangaka ◽  
S. Marais ◽  
...  
Keyword(s):  
South Africa ◽  
Vitamin D ◽  
Seasonal Variation ◽  
Cape Town ◽  
Vitamin D Status

scholarly journals Erratum to: CYP3A4 and seasonal variation in vitamin D status in addition to CYP2D6 contribute to therapeutic endoxifen level during tamoxifen therapy

2013 ◽  
Vol 142 (1) ◽  
pp. 225-225
Author(s):  
Wendy A. Teft ◽  
Inna Y. Gong ◽  
Brian Dingle ◽  
Kylea Potvin ◽  
Jawaid Younus ◽  
...  
Keyword(s):  
Vitamin D ◽  
Seasonal Variation ◽  
Tamoxifen Therapy ◽  
Vitamin D Status ◽  
Endoxifen Level

scholarly journals Long term follow-up of determinants of seasonal variation in vitamin d status in older adults

2014 ◽  
Vol 1 ◽  
pp. 20-21
Author(s):  
J. Pittaway ◽  
K.D.K. Ahuja ◽  
J. Beckett ◽  
M.L. Bird ◽  
I. Robertson ◽  
...  
Keyword(s):  
Older Adults ◽  
Vitamin D ◽  
Seasonal Variation ◽  
Vitamin D Status ◽  
Long Term Follow Up

CYP3A4 and seasonal variation in vitamin D status in addition to CYP2D6 contribute to therapeutic endoxifen level during tamoxifen therapy

2013 ◽  
Vol 139 (1) ◽  
pp. 95-105 ◽  
Author(s):  
Wendy A. Teft ◽  
Inna Y. Gong ◽  
Brian Dingle ◽  
Kylea Potvin ◽  
Jawaid Younus ◽  
...  
Keyword(s):  
Vitamin D ◽  
Seasonal Variation ◽  
Tamoxifen Therapy ◽  
Vitamin D Status ◽  
Endoxifen Level

Vitamin D status in Sri Lankans living in Sri Lanka and Norway

2008 ◽  
Vol 99 (5) ◽  
pp. 941-944 ◽  
Author(s):  
Haakon E. Meyer ◽  
Kristin Holvik ◽  
Cathrine M. Lofthus ◽  
Sampath U. B. Tennakoon
Keyword(s):  
Vitamin D ◽  
Seasonal Variation ◽  
Sri Lanka ◽  
Population Based ◽  
Vitamin D Status ◽  
Serum Samples ◽  
Cross Sectional ◽  
Population Based Study ◽  
Hydroxyvitamin D ◽  
Northern Latitudes

Vitamin D deficiency is common in non-Western immigrant groups living in Western countries. A comparison of vitamin D status in individuals who have emigrated and individuals who remain in their country of origin is needed in order to provide information about the effect of moving to northern latitudes. A total of 196 participants aged 30–60 years in a cross-sectional population-based study in Kandy, Sri Lanka (latitude 7° north) and 242 Sri Lankans aged 31–60 years participating in a cross-sectional population-based study in Oslo, Norway (latitude 60° north) were included in the analysis. All serum samples were analysed for serum 25-hydroxyvitamin D (s-25(OH)D) in the same laboratory. Sri Lankans living in Norway had substantially lower s-25(OH)D (mean 31·5 nmol/l) compared with those living in Sri Lanka (mean 54·2 nmol/l), and the prevalence of s-25(OH)D <  25 nmol/l was 9·3 times higher (95 % CI 4·4, 19·6) in Norway compared with Sri Lanka. In Sri Lanka there was a clear seasonal variation with the lowest s-25(OH)D levels in August–September and the highest levels in November–December. We conclude that vitamin D status among Sri Lankans living in Kandy, Sri Lanka was considerably higher than that among Sri Lankans living in Oslo, Norway. The low vitamin D status commonly observed in non-Western immigrant groups living at northern latitudes should not be regarded as normal levels for these groups. However, also in Sri Lanka we found a profound seasonal variation with the lowest levels in August and September after the Monsoon.

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