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Defining Adequate Vitamin D Intake : Cross-sectional and Intervention Studies
Viljakainen, Heli Tuulikki
University of Helsinki
2008-05-23
Doctoral dissertation (article-based)

In summary, vitamin D intake remains inadequate among the target groups of this thesis, as reflected by seasonal variation in calcitropic hormones and bone metabolism. Dietary intake of vitamin D should be increased to achieve at least an adequate vitamin D status (S-25-OHD>50 nmol/l) and possibly an optimal vitamin D status (S-25-OHD>80 nmol/l) throughout the year. This could be accomplished by introducing new vitamin D-fortified foods to the market.

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2008 May Heli Viljakainen Helsinki University doctoral dissertation Vitamin_D Defining definition adequate intake AI requirement requirements epidemiological clinical_trials humans nutrition Finland bone health osteoporosis prevention studies thesis

Lääkäri Juha-Petri Ruoholan väitöskirjan mukaan liian vähäinen D-vitamiinin saanti voi altistaa rasitusmurtumien syntymiselle urheilijoille. Tutkimuksen mukaan murtumapotilailla oli selkeästi normaalia alhaisemmat D-vitamiinitasot. On olemassa erityinen TRACP5b-entsyymi (tartrate-resistant acid phosphatase 5b), joka antaa aika selvän kuvan luun hajotuksen määrästä elimistössä. Tätä entsyymiä mitataan osteoporoosin (luukato) diagnostiikassa ja yllätyksettömästi sama entsyymi soveltui myös rasitusmurtumien osoittamiseen. Kohonnut seerumin TRACP5b-arvo nosti murtuman todennäköisyyden kahdeksankertaiseksi verrokkeihin nähden näissä Ruoholan tutkimuksissa. D-vitamiinia voi siis lämpimästi suositella urheilijoille varsinkin talvikuukausina, jolloin auringon kautta saatava D-vitamiinivaikutus on Suomessa lähes olematon.

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2007 maaliskuu March veteraaniurheilija christer sundqvist blogiartikkeli keskustelu D-vitamiini rasitusmurtumat terveys ravitsemus vitamin_D 25ohd bone fatigue stress fractures nutrition thesis dissertation Ruohola TRACP5b-entsyymi TRACP5b entsyymi

Kovaa harjoittelevat urheilijat! Lukekaa tämä teksti! Kova harjoittelu voi aiheuttaa rasitusmurtumia alaraajan luihin ja D-vitamiinia nauttimalla voidaan rasitusmurtumien synty ehkäistä.

Lääkäri Juha-Petri Ruoholan väitöskirjan mukaan liian vähäinen D-vitamiinin saanti voi altistaa rasitusmurtumien syntymiselle urheilijoille. Tutkimuksen mukaan murtumapotilailla oli selkeästi normaalia alhaisemmat D-vitamiinitasot.

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2009 elokuu Manninen Nutraceuticals Anssi blogi_artikkeli ravitsemus terveys D-vitamiini rasitusmurtumat urheilu ehkäisy luunmurtumat murtumat luusto 2007 March Ruohola bone fatigue stress fractures vitamin_D 25ohd dissertation thesis

Fatigue fractures in military conscripts : A study on risk factors, diagnostics and long-term consequences
Ruohola, Juha-Petri
University of Helsinki, Faculty of Medicine, Institute of Clinical Medicine, Orthopaedics and Traumatology, Helsinki University Central Hospital
Centre of Military Medicine, Helsinki
2007-03-09
Doctoral dissertation (article-based)

It seems likely that low vitamin D levels are related to fatigue fractures, and that an increasing trend exists between TRACP-5b bone resorption marker elevation and fatigue fracture incidence. Though seldom detected by plain radiography, fatigue fractures often underlie unclear lower leg stress-related pain occurring in the distal parts of the tibia. Femoral neck fatigue fractures, when displaced, lead to long-term morbidity in a high percentage of patients, whereas, when non-displaced, they do not predispose patients to subsequent adverse complications. Importantly, an educational intervention can diminish the incidence of fracture displacement by enhancing awareness and providing instructions for earlier diagnosis of fatigue fractures

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2007 March study research epidemiological humans Doctoral dissertation Helsinki university bone fatigue fractures stress vitamin_D 25ohd Ruohola military conscripts nutrition recruits thesis risk factors long-term consequences diagnostics

Investigating the links between muscle strength, sun exposure, dietary vitamin D intake and the vitamin D status of ambulatory older adults in South East Queensland
Borradale, David (2008)
QUT Thesis]

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2008 study research thesis dissertation vitamin_D intake status 25ohd muscle strength sun exposure sunlight ambulatory older old elderly humans nutrition Australia Queensland

Acid-base balance has an effect on bone turnover, especially on the rates of bone resorption and calcium mobilization. Bone mineral participates in the defense against acid-base disturbances, especially against metabolic acidosis (Lemann et al. 1966, Green & Kleeman 1991). The role of the bone mineral is important in the acid-base disorders, as no appreciable change in the intestinal calcium absorption occurs (Bichara et al. 1990).

In the mammalian body, mainly three hormones regulate the calcium metabolism and the bone turnover. 1,25-dihydroxycholecalciferol (vitamin D derivative) increases calcium absorption from the intestine and, indirectly, from bone. Parathyroid hormone mobilizes calcium from the bone and increases the urinary phosphate excretion. Calcitonin inhibits bone resorption (Ganong 1981). Used as drugs, these hormones are also capable of inducing acid-base disorders. Calcitonin administration (Escanero et al. 1991) and vitamin D excess (Bichara et al. 1990) have been reported to cause metabolic alkalosis.

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oulu thesis dissertation Acid-base balance bone osteoporosis calcitriol PTH calcitonin vitamin_D

The most common imbalance in the acid-base balance in the industrialized countries is mild chronic metabolic acidosis caused by the diet rich in the animal protein. Proteins are metabolized to organic acids. The typical American diet produces after metabolism approximately 100 meq of acid every day (Barzel 1995). This kind of a diet has been proved to cause aciduria and calciuria as a consequence of acidosis and thus a loss of total calcium of the body (Breslau et al. 1988, Schuette et al. 1980, Licata et al. 1981). Cola drinks that contain phosphoric acid are another acidosis-inducing ingredient of diet, especially among young people (Barzel 1995).

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oulu thesis dissertation Finland acid-base balance mild chronic metabolic acidosis animal protein diet nutrition Cola drinks phosphoric acid

Determination of Phylloquinone and Menaquinones in Foods by HPLC\n\nTerhi Koivu-Tikkanen\n\nAcademic Dissertation, January 2001. \nUniversity of Helsinki, Faculty of Agriculture and Forestry, \nDepartment of Applied Chemistry and Microbiology

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2001 Dissertation thesis study research in_vitro Phylloquinone Menaquinone vitamin_K vitamin_K1 vitamin_K2 MK-4 MK-8 MK-9 foods cheese liver Edam nutrition medline vitamin K vitamin K2 yoghurt yogurt sour milk content

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rest web architecture webservices programming design http Fielding Dissertation specification documentation doc reference science research imported delicious

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REST Fielding Dissertation Software Architecture webservices webservice development web webdev imported delicious web_development