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001-es BibID:BIBFORM073722
Első szerző:Grant, William B.
Cím:Why vitamin D clinical trials should be based on 25-hydroxyvitamin D concentrations / Grant William B., Boucher Barbara J., Bhattoa Harjit P., Lahore Henry
Dátum:2018
ISSN:0960-0760
Megjegyzések:Many health benefits are attributed to vitamin D, with those findings supported mostly by observational outcome studies of relationships to serum 25-hydroxyvitamin D [25(OH)D]. However, many randomized controlled trials (RCTs) aiming to confirm those findings have failed, perhaps because serum 25(OH)D is an index of UVB exposure and non-vitamin D mechanisms or because disease reduces serum 25(OH)D content. But the most likely reason for that failure is inappropriate design, conduct, analysis, and interpretation of RCTs. Most RCTs used principles designed to test pharmaceutical drugs; that design incorporates the assumptions that the RCT is the sole source of the agent and that dose-response relationships are linear. However, neither assumption is true for vitamin D, since neither vitamin D dose-responses or health outcome-serum 25(OH)D concentration relationships are linear?larger changes being induced with low rather than high baseline 25(OH)D values. Here, we propose a hybrid observational approach to vitamin D RCT design, based primarily on serum 25(OH)D concentration, requiring an understanding of serum 25(OH)D concentration-health outcome relationships, measuring baseline 25(OH)D values, recruiting non-replete subjects, measuring serum 25(OH)D during the trial for adjustment of supplemental doses for achievement of pretrial selection of target 25(OH)D values, where possible, and analyzing health outcomes in relation to those data rather than solely to vitamin D dosages.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Vitamin D
Randomized controlled trial
clinical trial
25-hydroxyvitamin D
observational study
Megjelenés:Journal Of Steroid Biochemistry And Molecular Biology. - 177 (2018), p. 266-269. -
További szerzők:Boucher, Barbara Bhattoa Harjit Pal (1973-) (laboratóriumi szakorvos) Lahore, Henry
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001-es BibID:BIBFORM067622
Első szerző:Grant, William B.
Cím:Seasonal variations of U.S. mortality rates : roles of solar ultraviolet-B doses, vitamin D, gene expression, and infections / Grant William B., Bhattoa Harjit Pal, Boucher Barbara J.
Dátum:2017
Megjegyzések:Death rates in the U.S. show a pronounced seasonality. The broad seasonal variation shows about 25% higher death rates in winter than in summer with an additional few percent increase associated with the Christmas and New Year's holidays. A pronounced increase in death rates also starts in mid-September, shortly after the school year begins. The causes of death with large contributions to the observed seasonality include diseases of the circulatory system; the respiratory system; the digestive system; and endocrine, nutritional, and metabolic diseases. Researchers have identified several factors showing seasonal variation that could possibly explain the seasonal variations in mortality rate. These factors include seasonal variations in solar ultraviolet-B(UVB) doses and serum 25-hydroxyvitamin D [25(OH)D] concentrations, gene expression, ambient temperature and humidity, UVB effects on environmental pathogen load, environmental pollutants and allergens, and photoperiod (or length of day). The factors with the strongest support in this analysis are seasonal variations in solar UVB doses and 25(OH)D concentrations. In the U.S., population mean 25(OH)D concentrations range from 21 ng/mL in March to 28 ng/mL in August. Measures to ensure that all people had 25(OH)D concentrations >36 ng/mL year round would probably reduce death rates significantly.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Vitamin D
Cardiovascular disease
Mortality rate
Season
Respiratory tract infections
Temperature
Gene expression
Megjelenés:The Journal of Steroid Biochemistry and Molecular Biology 173 (2017), p. 5-12. -
További szerzők:Bhattoa Harjit Pal (1973-) (laboratóriumi szakorvos) Boucher, Barbara
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3.

001-es BibID:BIBFORM067627
Első szerző:Pludowski, Pawel
Cím:Vitamin D supplementation guidelines / Pawel Pludowski, Michael F. Holick, William B. Grant, Jerzy Konstantynowicz, Mario R. Mascarenhas, Afrozul Haq, Vladyslav Povoroznyuk, Nataliya Balatska, Ana Paula Barbosa, Tatiana Karonova, Ema Rudenka, Waldemar Misiorowski, Irina Zakharova, Alena Rudenka, Jacek Łukaszkiewicz, Ewa Marcinowska-Suchowierska, Natalia Laszcz, Pawel Abramowicz, Harjit P. Bhattoa, Sunil J. Wimalawansa
Dátum:2018
Megjegyzések:Research carried out during the past two-decades extended the understanding of actions of vitamin D, from regulating calcium and phosphate absorption and bone metabolism to many pleiotropic actions in organs and tissues in the body. Most observational and ecological studies report association of higher serum 25-hydroxyvitamin D [25(OH)D] concentrations with improved outcomes for several chronic, communicable and non-communicable diseases. Consequently, numerous agencies and scientific organizations have developed recommendations for vitamin D supplementation and guidance on optimal serum 25(OH)D concentrations. The bone-centric guidelines recommend a target 25(OH)D concentration of 20 ng/mL (50 nmol/L), and age-dependent daily vitamin D doses of 400?800 IU. The guidelines focused on pleiotropic effects of vitamin D recommend a target 25(OH)D concentration of 30 ng/mL (75 nmol/L), and age-, body weight-, disease-status, and ethnicity dependent vitamin D doses ranging between 400 and 2000 IU/day. The wise and balanced choice of the recommendations to follow depends on one's individual health outcome concerns, age, body weight, latitude of residence, dietary and cultural habits, making the regional or nationwide guidelines more applicable in clinical practice. While natural sources of vitamin D can raise 25(OH)D concentrations, relative to dietary preferences and latitude of residence, in the context of general population, these sources are regarded ineffective to maintain the year-round 25(OH)D concentrations in the range of 30?50 ng/mL (75?125 nmol/L). Vitamin D self-administration related adverse effects, such as hypercalcemia and hypercalciuria are rare, and usually result from taking extremely high doses of vitamin D for a prolonged time.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Vitamin D
25(OH)D
Pleiotropic
Extra-skeletal effects
Global
Recommendations
Megjelenés:The Journal of Steroid Biochemistry and Molecular Biology 175 (2018), p. 125-135. -
További szerzők:Holick, Michael F. Grant, William B. Konstantynowicz, Jerzy Mascarenhas, Mario R. Haq, Afrozul Povoroznyuk, Vladyslav Balatska, Nataliya Barbosa, Ana Paula Karonova, Tatiana Rudenka, Ema Misiorowski, Waldemar Zakharova, Irina Rudenka, Alena Łukaszkiewicz, Jacek Marcinowska-Suchowierska, Ewa Laszcz, Natalia Abramowicz, Pawel Bhattoa Harjit Pal (1973-) (laboratóriumi szakorvos) Wimalawansa, Sunil J.
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