scholarly journals Changes in Serum 25 Hydroxyvitamin D Concentrations in Male University Long-Distance Runners Following Vitamin D3 Supplementation During Winter: A Randomized Controlled Trial

2021 ◽  
Author(s):  
Toraishi Mami ◽  
Kasai Mayumi ◽  
Nakano Takayuki ◽  
Sasahara Jun
Keyword(s):  
Vitamin D ◽  
Placebo Group ◽  
Dietary Vitamin ◽  
Intervention Period ◽  
Distance Runners ◽  
Post Intervention ◽  
Long Distance ◽  
Hydroxyvitamin D ◽  
Vitamin D Intake ◽  
25 Hydroxyvitamin D

Abstract BackgroundVitamin D insufficiency and deficiency remain a global problem, even among athletes. In this study, we evaluated the serum 25 hydroxyvitamin D [25 (OH) D] concentrations of male long-distance runners during winter and the effect of short-term vitamin D3 supplementation to elucidate their dietary vitamin D requirements. MethodsUsing double-blind randomization, 34 athletes on the “Ekiden” (long-distance road race) team at University A were divided into a vitamin D group (n = 17, 25 μg/day of vitamin D3 intake) and a placebo group (n = 17, placebo tablet intake). Both groups ate normal meals with either the supplement or placebo included, and all subjects underwent a 31-day dietary survey. The pre- and post-intervention body composition and blood test were measured and compared.ResultsPrior to intervention, the vitamin D intake amount was 16.7 ± 7.2 μg/day, but the serum 25 (OH) D concentration was 28.9 ± 5.7 ng/mL, and 22 (65%) of the 34 subjects had insufficient vitamin D (<30 ng/mL). During the intervention period, the mean amount of vitamin D intake was 40.0 ± 5.5 μg/day in the vitamin D group and 13.4 ± 7.7 μg/day in the placebo group. Serum 25 (OH) D concentrations increased from 30.7 ± 6.7 ng/mL to 35.4 ± 6.6 ng/mL in the vitamin D group and from 27.1 ± 3.9 ng/mL to 28.5 ± 4.4 ng/mL in the placebo group, respectively (p < 0.001, p < 0.01). After intervention, the serum 25 (OH) D concentration in the vitamin D group was significantly higher (p < 0.001). Additionally, the rate of vitamin D sufficiency was 82% in the vitamin D group and 43% in the placebo group, indicating a significant difference (p < 0.01). ConclusionsOur results demonstrate that post-intervention serum 25 (OH) D concentration was related to both mean vitamin D intake amount during the intervention period and pre-intervention serum 25 (OH) D concentration. However, to better quantify the required amount of vitamin D, further study of the effect of vitamin D supplementation on bone health is needed.

scholarly journals Vitamin D Status in Japanese Adults: Relationship of Serum 25-Hydroxyvitamin D with Simultaneously Measured Dietary Vitamin D Intake and Ultraviolet Ray Exposure

Nutrients ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 743 ◽  
Author(s):  
Keiko Asakura ◽  
Norihito Etoh ◽  
Haruhiko Imamura ◽  
Takehiro Michikawa ◽  
Takahiro Nakamura ◽  
...  
Keyword(s):  
Vitamin D ◽  
Exposure Time ◽  
Serum Vitamin ◽  
Vitamin D Insufficiency ◽  
Uv Exposure ◽  
Dietary Vitamin ◽  
Hydroxyvitamin D ◽  
Vitamin D Intake ◽  
25 Hydroxyvitamin D ◽  
Ultraviolet Ray

Vitamin D insufficiency/deficiency is prevalent worldwide. We investigated the effect of vitamin D intake and ultraviolet ray (UV) exposure on serum vitamin D concentration in Japan. A total of 107 healthy adult participants were recruited from Hokkaido (43° N) and Kumamoto (33° N) prefectures. All participants undertook surveys in both summer and winter. Serum 25-hydroxyvitamin D (25(OH)D3) was examined, and vitamin D intake was assessed with a diet history questionnaire. UV exposure was measured with a wearable UV dosimeter. Regression analysis was performed to investigate the relationship between these factors, with covariates such as sun avoidance behavior. The prevalence of vitamin D insufficiency (serum 25(OH)D3; 12 ng/mL (30 nmol/L) ≤ and <20 ng/mL (50 nmol/L))/deficiency (<12 ng/mL) was 47.7% in summer and 82.2% in winter. UV exposure time was short in Kumamoto (the urban area), at 11.6 min in summer and 14.9 min in winter. In Hokkaido (the rural area), UV exposure time was 58.3 min in summer and 22.5 min in winter. Vitamin D intake was significantly associated with serum 25(OH)D3, and a 1 μg/1000kcal increase in intake was necessary to increase 25(OH)D3 by 0.88 ng/mL in summer and by 1.7 ng/mL in winter. UV exposure time was significantly associated with serum 25(OH)D3 in summer, and a 10 min increase in UV exposure time was necessary to increase 25(OH)D3 by 0.47 ng/mL. Although consideration of personal occupation and lifestyle is necessary, most Japanese may need to increase both vitamin D intake and UV exposure.

scholarly journals Dietary vitamin D intake and serum 25-hydroxyvitamin D level in relation to disease outcomes in head and neck cancer patients

2010 ◽  
Vol 128 (7) ◽  
pp. 1741-1746 ◽  
Author(s):  
François Meyer ◽  
Geoffrey Liu ◽  
Pierre Douville ◽  
Élodie Samson ◽  
Wei Xu ◽  
...  
Keyword(s):  
Vitamin D ◽  
Head And Neck Cancer ◽  
Head And Neck ◽  
Cancer Patients ◽  
Dietary Vitamin ◽  
Hydroxyvitamin D ◽  
Vitamin D Intake ◽  
Disease Outcomes ◽  
25 Hydroxyvitamin D ◽  
Dietary Vitamin D

scholarly journals Effects of Moderate Sun Exposure and Vitamin D Supplementation on Serum 25-Hydroxyvitamin D Concentration Among Malay Women

2021 ◽  
Vol 5 (Supplement_2) ◽  
pp. 1304-1304
Author(s):  
Norliyana Aris ◽  
Hamid Jan Bin Jan Mohamed ◽  
Wan Mohd Izani Bin Wan Mohamed
Keyword(s):  
Vitamin D ◽  
Placebo Group ◽  
Vitamin D Deficiency ◽  
Sun Exposure ◽  
Vitamin D Supplementation ◽  
Dietary Vitamin ◽  
Hydroxyvitamin D ◽  
25 Hydroxyvitamin D ◽  
Hands And Feet ◽  
Vitamin D Supplement

Abstract Objectives Known as ‘sunshine vitamin’, sun exposure is a major and natural source of vitamin D. This study aimed to investigate the effects of moderate sun exposure and vitamin D supplementation on vitamin D concentration among Malay women in Kelantan, Malaysia. Methods A quasi-experimental study design was carried out among female indoor workers with vitamin D deficiency (serum 25-hydroxyvitamin D &lt; 50 nmol/l) for 12 weeks to evaluate the effects of moderate sun exposure (n = 19; 15 minutes sun exposure biweekly on face, lower arms, hands and feet), vitamin D supplementation (n = 15; 50 000 IU cholecalciferol weekly) and placebo (n = 15) on serum 25-hydroxyvitamin D (25(OH)D) levels. Data was collected twice from each respondent, firstly during baseline and secondly during endpoint. Body composition measurements (body fat percentage and body mass index), fasting blood test (serum 25(OH)D level) and questionnaire (socio-demographic, physical activity and dietary vitamin D intake) were conducted. The vitamin D classification was based on the 2011 Endocrine Society Clinical Practice Guidelines. Repeated measure ANOVA within group analysis was applied. Results The baseline characteristics did not differ significantly among study groups except for age (F = 6.15, p = 0.004). After 12 weeks, serum 25(OH)D levels increased significantly in sun exposure (mean difference (MD) = 14.27 nmol/l, p &lt; 0.001) and vitamin D supplement group (MD = 14.30 nmol/l, p &lt; 0.001) but not in the placebo group (MD = 1.63 nmol/l, p = 0.067). Conclusions The 12-weeks intervention with moderate sun exposure and vitamin D supplementation showed a similar significant increment in serum 25(OH)D levels. However, no changes in serum 25(OH)D was observed in the placebo group. These results showed that sunlight exposure and vitamin D supplement were equally helpful in improving serum 25(OH)D levels in participants with vitamin D deficiency. Funding Sources Short Term Research Grant, Universiti Sains Malaysia.

scholarly journals Genetic and environmental predictors of serum 25-hydroxyvitamin D concentrations among middle-aged and elderly Chinese in Singapore

2012 ◽  
Vol 109 (3) ◽  
pp. 493-502 ◽  
Author(s):  
Kim Robien ◽  
Lesley M. Butler ◽  
Renwei Wang ◽  
Kenneth B. Beckman ◽  
Dinesha Walek ◽  
...  
Keyword(s):  
Vitamin D ◽  
Bone Structure ◽  
Health Study ◽  
Dietary Vitamin ◽  
Middle Aged ◽  
Hydroxyvitamin D ◽  
Vitamin D Intake ◽  
Singapore Chinese ◽  
25 Hydroxyvitamin D ◽  
Dietary Vitamin D

Vitamin D is known for maintaining Ca homeostasis and bone structure, and may also decrease susceptibility to chronic and infectious diseases. However, data on vitamin D status and its predictors among Southeast Asian populations are limited. We evaluated the distribution and determinants (genetic and environmental) of serum 25-hydroxyvitamin D (25(OH)D) concentrations among 504 middle-aged and elderly participants (aged 45–74 years) in the Singapore Chinese Health Study. Data on dietary and other lifestyle factors were collected by trained interviewers. Serum 25(OH)D concentrations and genetic polymorphisms in vitamin D metabolism pathway enzymes (cytochrome P450 (CYP)2R1,3A4,27B1,24A1; vitamin D binding protein (also known as group-specific component,GC); and vitamin D receptor) were measured using stored biospecimens. Mean 25(OH)D concentration was 68·8 nmol/l. Serum 25(OH)D concentrations were positively associated with dietary vitamin D intake, and inversely associated with hours spent sitting at work. BMI was not associated with 25(OH)D concentrations.CYP2R1rs10741657, rs12794714, rs1993116;CYP3A4rs2242480; andGCrs4588, rs7041, rs16847015, rs2298849 were statistically significantly associated with 25(OH)D concentrations. Individuals with theGc2-2haplotype (rs4588AA/rs7041TT) had statistically significantly lower 25(OH)D concentrations compared to all otherGchaplotypes (P-trend < 0·001). The majority of participants (86 %) had 25(OH)D concentrations ≥ 50 nmol/l, which is consistent with the 2011 Institute of Medicine (US) recommendation for bone health, and 32 % had concentrations of ≥ 75 nmol/l that are thought to be required for broader health effects. Dietary vitamin D intake, hours spent indoors at work and genetic variation inCYP2R1,CYP3A4andGCare significant predictors of 25(OH)D concentrations among Singapore Chinese.

PT03.4: Serum 25 Hydroxyvitamin D Positively Associated with Dietary Vitamin D Intake Among Brazilian Adolescents

2016 ◽  
Vol 35 ◽  
pp. S27
Author(s):  
K.V. Giudici ◽  
M.A.P. Lopes ◽  
R.M. Fisberg ◽  
L.A. Martini
Keyword(s):  
Vitamin D ◽  
Dietary Vitamin ◽  
Hydroxyvitamin D ◽  
Vitamin D Intake ◽  
25 Hydroxyvitamin D ◽  
Dietary Vitamin D

scholarly journals Validation of Dietary Vitamin D Intake from Two Food Frequency Questionnaires, Using Food Records and the Biomarker 25-Hydroxyvitamin D among Pregnant Women

Nutrients ◽  
2018 ◽  
Vol 10 (6) ◽  
pp. 745 ◽  
Author(s):  
Linnea Bärebring ◽  
Anna Amberntsson ◽  
Anna Winkvist ◽  
Hanna Augustin
Keyword(s):  
Vitamin D ◽  
Pregnant Women ◽  
Dietary Vitamin ◽  
Food Frequency ◽  
Hydroxyvitamin D ◽  
Food Records ◽  
Vitamin D Intake ◽  
25 Hydroxyvitamin D ◽  
Dietary Vitamin D

scholarly journals Dietary Calcium Intake and Hypertension: Importance of Serum Concentrations of 25-Hydroxyvitamin D

Nutrients ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 911 ◽  
Author(s):  
Nakamura ◽  
Tsujiguchi ◽  
Hara ◽  
Kambayashi ◽  
Miyagi ◽  
...  
Keyword(s):  
Vitamin D ◽  
Calcium Intake ◽  
Dietary Calcium ◽  
Dietary Vitamin ◽  
Dietary Calcium Intake ◽  
Serum Concentrations ◽  
Hydroxyvitamin D ◽  
Vitamin D Intake ◽  
25 Hydroxyvitamin D ◽  
Dietary Vitamin D

The relationship among dietary calcium, hypertension and vitamin D status currently remains unclear. This population-based cross-sectional study examined the association between dietary calcium intake and hypertension and the influence of serum concentrations of 25-hydroxyvitamin D [25(OH)D] in Japanese subjects. A total of 619 subjects aged from 40 years were recruited. Dietary intake was measured using a validated brief self-administered diet history questionnaire. Hypertension was defined as the use of antihypertensive medication or a blood pressure of 140/90 mmHg. Serum concentrations of 25(OH)D were used as the biomarker of vitamin D status. The prevalence of hypertension and low serum 25(OH)D levels (<20 ng/mL) were 55 and 32%, respectively. Dietary calcium intake inversely correlated with hypertension in subjects with serum 25(OH)D levels higher than 20 ng/mL (OR: 0.995; 95% CI: 0.991, 0.999) but it was not significant in those with serum 25(OH)D levels of 20 ng/mL or lower. Furthermore, dietary vitamin D intake correlated with serum concentrations of 25(OH)D after adjustments for various confounding factors. The present results demonstrate that the regular consumption of calcium may contribute to the prevention and treatment of hypertension in subjects with a non-vitamin D deficiency and also that dietary vitamin D intake may effectively prevents this deficiency.

scholarly journals Associations of the risk of lung cancer with serum 25-hydroxyvitamin D level and dietary vitamin D intake

Medicine ◽  
2018 ◽  
Vol 97 (37) ◽  
pp. e12282 ◽  
Author(s):  
Hu Wei ◽  
Hu Jing ◽  
Qian Wei ◽  
Guo Wei ◽  
Zhou Heng
Keyword(s):  
Lung Cancer ◽  
Vitamin D ◽  
Dietary Vitamin ◽  
Hydroxyvitamin D ◽  
Vitamin D Intake ◽  
25 Hydroxyvitamin D ◽  
Dietary Vitamin D

scholarly journals Effects of sun exposure and dietary vitamin D intake on serum 25-hydroxyvitamin D status in hemodialysis patients

2015 ◽  
Vol 9 (2) ◽  
pp. 158 ◽  
Author(s):  
Yeon Joo Lee ◽  
Il Hwan Oh ◽  
Hee Jun Baek ◽  
Chang Hwa Lee ◽  
Sang Sun Lee
Keyword(s):  
Vitamin D ◽  
Sun Exposure ◽  
Hemodialysis Patients ◽  
Dietary Vitamin ◽  
Hydroxyvitamin D ◽  
Vitamin D Intake ◽  
25 Hydroxyvitamin D ◽  
Dietary Vitamin D

scholarly journals Serum 25-hydroxyvitamin D but not dietary vitamin D intake is associated with hemoglobin in women of reproductive age in rural northern Vietnam

2017 ◽  
Vol 8 ◽  
pp. 41-48 ◽  
Author(s):  
Ellen S. Michalski ◽  
Phuong H. Nguyen ◽  
Ines Gonzalez-Casanova ◽  
Son V. Nguyen ◽  
Reynaldo Martorell ◽  
...  
Keyword(s):  
Vitamin D ◽  
Reproductive Age ◽  
Dietary Vitamin ◽  
Women Of Reproductive Age ◽  
Northern Vietnam ◽  
Hydroxyvitamin D ◽  
Vitamin D Intake ◽  
25 Hydroxyvitamin D ◽  
Dietary Vitamin D
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