scholarly journals Estimations of the Erythemal UV Doses and the Amount of the Sun-Synthesized Vitamin D by Adults during the Cruise to Spitsbergen–Polar Measurement Campaign (2–21 July 2017)

Atmosphere ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 474
Author(s):  
Agnieszka Czerwińska ◽  
Wiktoria Czuchraj
Keyword(s):  
Vitamin D ◽  
Vitamin D3 ◽  
Oral Intake ◽  
The Arctic ◽  
Vitamin Supplementation ◽  
The Sun ◽  
Uv Index ◽  
Measurement Campaign ◽  
Adequate Amount ◽  
The World

UV index (UVI) measurements were carried out by the hand-held instrument Solarmeter 6.5 onboard of MS Horyzont II during the cruise from Poland (Gdynia) to Spitsbergen (and back) in the period from 2 to 21 July 2017. A method is proposed to estimate the erythemal doses and sun-synthesized amount of vitamin D from a limited number of daily UVI observations. This study shows that the erythema could appear in a person with Caucasian type of skin characterized by Minimum Erythema Dose (MED) ~250 J m−2 after ~1 h exposure near the polar circle and up to few hours in the Svalbard. During this time, it was possible to get the dose of vitamin D3 equivalent to ~1000 IU of oral intake. The protection against UV overexposure should be applied even if UVI values during the cruise in the Arctic were always below the World Meteorological Organization (WMO) warning threshold of 3. To provide adequate amount of vitamin D, the exposure should be continued until getting 1 MED, after which the vitamin supplementation (or a diet rich in vitamin D) is necessary.

Abstract 121: Vitamin D Deficiency Study in Postural Orthostatic Tachycardia Syndrome

2015 ◽  
Vol 8 (suppl_2) ◽  
Author(s):  
Chandralekha Ashangari ◽  
Amer Suleman
Keyword(s):  
Vitamin D ◽  
Vitamin D Deficiency ◽  
Electronic Medical Records ◽  
Vitamin D3 ◽  
Medical Records ◽  
Postural Orthostatic Tachycardia Syndrome ◽  
Vitamin D Levels ◽  
The World ◽  
25 Oh Vitamin D ◽  
Vitamin D3 Deficiency

Objectives The aim of this study is to assess vitamin D levels, including the prevalence of vitamin D deficiency/insufficiency in Postural Orthostatic Tachycardia Syndrome (POTS) patients. Background : The Postural Orthostatic Tachycardia Syndrome (POTS) affects primarily young women. POTS is a form of dysautonomia that is estimated to impact between 1,000,000 and 3,000,000 Americans, and millions more around the world. We frequently find vitamin D deficiency in patients who present with POTS Methods: 180 patients were selected randomly from our clinic with POTS. Patients Vitamin D levels charts were reviewed from electronic medical records, 25-OH vitamin D (Vitamin D3 ) status was defined as Normal (>30 ng/mL), Insufficient (20.0-29.9 ng/mL), and deficient (<20 ng/mL). Results: Out of 180 patients, 170 patients are female (94%, n=170, age 31.88±10.36), 10 patients are male (6% ,age 25.83±6.19). 79 patients had vitamin D3 level >30 ng/ml, 10 patients had vitamin D3 level range >20.0 to 29.9 ng/mL, 91 patients had vitamin D3 level < 20ng/mL. Conclusion: Our research results demonstrated that Postural Orthostatic Tachycardia Syndrome (POTS) patients have a higher rate of vitamin D3 deficiency (51% have Vitamin D3 less than 20 ng/mL). Vitamin D3 levels are low in more than half of POTS patients (56% had less than 30 ng/mL )

scholarly journals High levels of ultraviolet radiation observed by ground-based instruments below the 2011 Arctic ozone hole

2013 ◽  
Vol 13 (21) ◽  
pp. 10573-10590 ◽  
Author(s):  
G. Bernhard ◽  
A. Dahlback ◽  
V. Fioletov ◽  
A. Heikkilä ◽  
B. Johnsen ◽  
...  
Keyword(s):  
The Arctic ◽  
The Sun ◽  
Outdoor Activity ◽  
Uv Index ◽  
Arctic Alaska ◽  
The Face ◽  
Western Arctic ◽  
Standard Deviations ◽  
Uv Dose ◽  
Ozone Episode

Abstract. Greatly increased levels of ultraviolet (UV) radiation were observed at thirteen Arctic and sub-Arctic ground stations in the spring of 2011, when the ozone abundance in the Arctic stratosphere dropped to the lowest amounts on record. Measurements of the noontime UV Index (UVI) during the low-ozone episode exceeded the climatological mean by up to 77% at locations in the western Arctic (Alaska, Canada, Greenland) and by up to 161% in Scandinavia. The UVI measured at the end of March at the Scandinavian sites was comparable to that typically observed 15–60 days later in the year when solar elevations are much higher. The cumulative UV dose measured during the period of the ozone anomaly exceeded the climatological mean by more than two standard deviations at 11 sites. Enhancements beyond three standard deviations were observed at seven sites and increases beyond four standard deviations at two sites. At the western sites, the episode occurred in March, when the Sun was still low in the sky, limiting absolute UVI anomalies to less than 0.5 UVI units. At the Scandinavian sites, absolute UVI anomalies ranged between 1.0 and 2.2 UVI units. For example, at Finse, Norway, the noontime UVI on 30 March was 4.7, while the climatological UVI is 2.5. Although a UVI of 4.7 is still considered moderate, UV levels of this amount can lead to sunburn and photokeratitis during outdoor activity when radiation is reflected upward by snow towards the face of a person or animal. At the western sites, UV anomalies can be well explained with ozone anomalies of up to 41% below the climatological mean. At the Scandinavian sites, low ozone can only explain a UVI increase of 50–60%. The remaining enhancement was mainly caused by the absence of clouds during the low-ozone period.

Vitamina D e rachitismo carenziale

2020 ◽  
Vol 39 (7) ◽  
pp. 426-429
Author(s):  
Anna Agrusti ◽  
Sarah Contorno ◽  
Irene Bruno ◽  
Giulia Gortani ◽  
Egidio Barbi
Keyword(s):  
Vitamin D ◽  
Vitamin D Deficiency ◽  
Vitamin D3 ◽  
Vitamin D Supplementation ◽  
High Dose ◽  
The Sun ◽  
Phosphorus Metabolism ◽  
Calcium Phosphorus ◽  
Vitamin D3 Supplementation ◽  
First Year Of Life

Mouhamed, a 7-year-old boy of African origin, presented with progressive fatigue and difficulty in walking. He was never treated with vitamin D supplementation. The evaluation of his calcium-phosphorus metabolism revealed a myopathy related to severe rickets. Therefore, he was treated with high-dose vitamin D3 and myopathy and fatigue progressively resolved. Vitamin D plays a crucial role in the calcium-phosphorus metabolism, by acting on enterocytes, osteoclasts and renal tubule. Vitamin D deficiency is defined when the 25OHD value is less than 20 ng/ml. In order to guarantee the assumption of the minimum daily dose of vitamin D, it is recommended to start vitamin D3 supplementation in all newborns and infants in their first year of life, regardless of the feeding modality. Exposure to the sun is essential for the activation of vitamin D, so dark-skinned children and mothers or those little exposed to the sun should start vitamin D3 supplementation. Vitamin D3 should also be supplemented in children with cerebral palsy and in patients treated with anti-epileptic drugs. Other conditions at risk of vitamin D deficiency are inflammatory bowel disease, celiac disease, cystic fibrosis, obesity, liver failure, cholestasis and vegetarian or vegan diets. Classic signs of rickets are the rickety rosary, the widening of the wrist and the arching of the tibia. Severe hypocalcaemia secondary to vitamin D deficiency can occur with dilated cardiomyopathy or convulsions, especially in dark-skinned infants. Vitamin D deficiency should be considered in children with progressive myopathy or muscular weakness, especially in dark-skinned ones or in those poorly exposed to the sun for cultural or religious reasons.

scholarly journals High levels of ultraviolet radiation observed by ground-based instruments below the 2011 Arctic ozone hole

2013 ◽  
Vol 13 (6) ◽  
pp. 17253-17297
Author(s):  
G. Bernhard ◽  
A. Dahlback ◽  
V. Fioletov ◽  
A. Heikkilä ◽  
B. Johnsen ◽  
...  
Keyword(s):  
The Arctic ◽  
The Sun ◽  
Outdoor Activity ◽  
Uv Index ◽  
Arctic Alaska ◽  
The Face ◽  
Western Arctic ◽  
Standard Deviations ◽  
Uv Dose ◽  
Ozone Episode

Abstract. Greatly increased levels of ultraviolet (UV) radiation were observed at thirteen Arctic and sub-Arctic ground stations in the spring of 2011 when the ozone abundance in the Arctic stratosphere dropped to the lowest amounts on record. Measurements of the noontime UV Index (UVI) during the low-ozone episode exceeded the climatological mean by up to 77% at locations in the western Arctic (Alaska, Canada, Greenland) and by up to 161% in Scandinavia. The UVI measured at the end of March at the Scandinavian sites was comparable to that typically observed 15–60 days later in the year when solar elevations are much higher. The cumulative UV dose measured during the period of the ozone anomaly exceeded the climatological mean by more than two standard deviations at 11 sites. Enhancements beyond three standard deviations were observed at seven sites and increases beyond four standard deviations at two sites. At the western sites, the episode occurred in March when the Sun was still low in the sky, limiting absolute UVI anomalies to less than 0.5 UVI units. At the Scandinavian sites, absolute UVI anomalies ranged between 1.0 and 2.2 UVI units. For example, at Finse, Norway, the noontime UVI on 30 March was 4.7 while the climatological UVI is 2.5. Although a UVI of 4.7 is still considered moderate, UV levels of this amount can lead to sunburn and photokeratitis during outdoor activity when radiation is reflected upward by snow towards the face of a person or animal. At the western sites, UV anomalies can be well explained with ozone anomalies of up to 41% below the climatological mean. At the Scandinavian sites, low ozone can only explain a UVI increase by 50–60%. The remaining enhancement was mainly caused by the absence of clouds during the low-ozone period.

scholarly journals Vitamin D Deficiency: A common problem worldwide

2020 ◽  
Vol 2 (2) ◽  
pp. 106-108
Author(s):  
Narayan Bahadur Mahotra
Keyword(s):  
Vitamin D ◽  
Dietary Supplements ◽  
Vitamin D3 ◽  
Large Scale ◽  
South Asians ◽  
Oral Intake ◽  
Reference Value ◽  
Ultraviolet B ◽  
Synthesis Process ◽  
Uvb Exposure

Humans get vitamin D from exposure to sunlight. Diet and dietary supplements are other sources of vitamin D. Our body creates most of our vitamin D from modest exposure to direct Ultraviolet B (UVB) sunlight. Regular, short periods of UVB exposure during the summer months are enough to get required vitamin D for most people. Sunscreen might block the vitamin D synthesis process in skin. Solar ultraviolet B radiation (wavelength, 290 to 315 nm) penetrates the skin and converts7-dehydrocholesterol to provitamin D3, which is rapidly converted to vitamin D3. Excessive exposure to sunlight does not cause vitamin D3 intoxication but excess oral intake can cause intoxication. Therefore, we should be careful while taking dietary supplements of vitamin D. Regardless of the good sunlight exposure, surprisingly, the blood level of vitamin D is found to be low in people of South Asian countries including Nepal. No practice of sun bath and all the time body coverage with clothes could be the possible reason of low vitamin D level in this region of the world. Another possibility is normal reference value of vitamin D level might be low in South Asians compared to western countries. So, large scale research including all required parameters can solve these concerns and queries.  

scholarly journals Current Status and Prevention of COVID-19What Do We Know?

2020 ◽  
pp. 1-7
Keyword(s):  
Vitamin D ◽  
Viral Infections ◽  
Hypovitaminosis D ◽  
Current Status ◽  
High Humidity ◽  
The Sun ◽  
The World ◽  
Balance Diet ◽  
Respiratory Viral Infections ◽  
Effective Public Health

COVID-19 spread across the world, like a wildfire during the first half of the year 2020. It coincided with the flu season in countries located in northern and southern latitudes, during their respective winter periods. Whereas in the middle east, during its summertime people develop hypovitaminosis D, when people completely avoid the sun due to extreme heat. Consequently, people stay away from the hot sun and consequently, vitamin D concertation and the innate immunity reduce, increaseing the risks of acquiring respiratory viral infections. Thus, it is not necessary the low temperature and high humidity but the lack of exposure to ultraviolet (UV) B rays from the sunlight that reduces the population vitamin D concentration, which weakens the immunity, thereby increasing the risk of contracting COVID-19, and to develop associated complications and deaths. The effective public health modes for prevention of COVID-19 includes, wearing face masks properly covering nose and mouth, avoid crowd gatherings, especially in enclosed spaces, washing hands each time returned to office or home, and having a balance diet with adequate micronutrients, and these use of UVC lamps. At present there is no specific antiviral, or safe, effective, and affordable vaccine against COVID-19; it is unlikely such would materialize during the year 2020 or even beyond. At present, the only proven intervention that prevent COVID-19 and reduces its complications and deaths is vitamin D.

Vitamin D3 supplementation improves glycemic control in type 2 diabetic patients: Results from an Italian clinical trial

2020 ◽  
pp. 1-10
Author(s):  
Giuseppe Derosa ◽  
Angela D’Angelo ◽  
Chiara Martinotti ◽  
Maria Chiara Valentino ◽  
Sergio Di Matteo ◽  
...  
Keyword(s):  
Vitamin D ◽  
Vitamin D Deficiency ◽  
Metabolic Control ◽  
Vitamin D3 ◽  
Therapy Group ◽  
Hypoglycemic Agents ◽  
Diabetic Patients ◽  
Type 2 Diabetic Patients ◽  
Type 2 Diabetic

Abstract. Background: to evaluate the effects of Vitamin D3 on glyco-metabolic control in type 2 diabetic patients with Vitamin D deficiency. Methods: one hundred and seventeen patients were randomized to placebo and 122 patients to Vitamin D3. We evaluated anthropometric parameters, glyco-metabolic control, and parathormone (PTH) value at baseline, after 3, and 6 months. Results: a significant reduction of fasting, and post-prandial glucose was recorded in Vitamin D3 group after 6 months. A significant HbA1c decrease was observed in Vitamin D3 (from 7.6% or 60 mmol/mol to 7.1% or 54 mmol) at 6 months compared to baseline, and to placebo (p < 0.05 for both). At the end of the study period, we noticed a change in the amount in doses of oral or subcutaneous hypoglycemic agents and insulin, respectively. The use of metformin, acarbose, and pioglitazone was significantly lower (p = 0.037, p = 0.048, and p = 0.042, respectively) than at the beginning of the study in the Vitamin D3 therapy group. The units of Lispro, Aspart, and Glargine insulin were lower in the Vitamin D3 group at the end of the study (p = 0.031, p = 0.037, and p = 0.035, respectively) than in the placebo group. Conclusions: in type 2 diabetic patients with Vitamin D deficiency, the restoration of value in the Vitamin D standard has led not only to an improvement in the glyco-metabolic compensation, but also to a reduced posology of some oral hypoglycemic agents and some types of insulin used.

Vitamin-D-Effekte auf Komponenten des kardiovaskulären Risikos

2011 ◽  
Vol 20 (04) ◽  
pp. 314-319
Author(s):  
H. Sourij ◽  
H. Dobnig
Keyword(s):  
Vitamin D ◽  
Vitamin D3

ZusammenfassungGroße Beobachtungsstudien legen einen Zusammenhang zwischen Vitamin-D-Mangel und kardiovaskulärem Risiko bis hin zur Mortalität nahe. Manche Beobachtungen werden auch durch präklinische Studienergebnisse unterstützt. Für praktisch alle wichtigen kardiovaskulären Endpunkte fehlen heute jedoch Ergebnisse randomisierter und ausreichend langer durchgeführter Studien. Der Vitamin-D-Mangel ist ebenso wie andere Risikofaktoren für Herzkreislauf-Erkrankung äußerst prävalent, so dass auch kleinere Effekte theoretisch große Bedeutung für die Volksgesundheit haben könnten. Die DVO-Leitlinien empfehlen eine Vitamin-D-Gabe von 800–2000 IE Vitamin D3 täglich. Damit können nachteilige muskuloskelettale Effekte erwiesenermaßen vermieden und gleichzeitig auch mögliche kardiovaskuläre Vorteile erzielt werden.

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