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Fizinio aktyvumo įtaka osteoporozės rizikai vyresniame amžiuje / Influence of physical activity on osteoporosis risk in elderlyBartnikienė, Jovilė 16 August 2007 (has links)
Nors kaulų būklės tyrimai Lietuvoje tęsiami ir kaulų tankis matuojamas ne vienoje poliklinikoje ir ne vienoje ligoninėje, vis dar yra aktualu pasirinkti tiriamųjų kontingentą, įvertinti jų fizinio aktyvumo lygį, gyvenimo būdą bei įpročius bei tuo pačiu kaupti kaulų medžiagos tankio ir osteoporozės duomenų bazę.
Darbo tikslas: Įvertinti fizinio aktyvumo įtaką vyresniame amžiuje kaulų tankio rodikliams osteoporozės rizikos populiacijoje. Darbe iškelti uždaviniai: 1) Įvertinti antropometrinius bei osteodensitometrinius duomenis, fizinio aktyvumo lygį, osteoporozės riziką ir sudaryti vyresnio amžiaus osteoporozės riziką turinčiųjų „statistinį portretą“; 2) Nustatyti antropometrinių, osteodensitometrinių ir fizinės veiklos rodiklių tarpusavio ryšį ir ryšį su osteoporozės diagnoze; 3) Įvertinti gyvenimo būdo bei įpročių įtaką fizinio aktyvumo ir osteoporozės rizikos santykį; 4) Palyginti 2004 ir 2007 metų tyrimo rezultatus vertinat fizinio aktyvumo įtaką osteoporozės rizikai.
Tyrime dalyvavo vyresnio amžiaus osteoporozės rizikos asmenys (n=135), apsilankiusieji 2006-2007 metų laikotarpyje Kauno m. Dainavos poliklinikos Densitometrijos kabinete pagal gydytojo nukreipimą dėl endokrinologinių ir reumatologinių negalavimų. Darbe buvo taikyti šie tyrimo metodai: literatūrinė analizė; ultragarsinė densitometrija, anketavimas, matematinė statistika.
Tyrimo metu nustatytas vyresnio amžiaus žmonių „statistinis portretas", kuriam būdingi šie požymiai: moteriška lytis (85% moteris), amžius 6... [toliau žr. visą tekstą] / A study design was directed to the following problematical question: is there any reasonable relation between prospective and current physical activity and osteoporosis diagnosis in population suffered from metabolic disorders? What "statistical portrait" represents this population? The research hypothesis suggested: the physical activity along all lifetime at sufficient bone load level, leading by appropriate lifestyle habits, it must lower osteoporosis risk in elderly just occurred metabolic disorders. The purpose of the present study was to asses the effects of daily time physical activity and leisure time physical activity on bone stiffness in elderly population with osteoporosis risk. The following study tasks were addressed: 1) to asses the anthropometric data and bone density, the level of physical activity, risk of osteoporosis, and to describe the "statistical portrait" of elderly individuals having osteoporosis risk; 2) to evaluate the relationship between anthropometric and bone density data and physical activity level, as well as their relationship with osteoporosis; 3) to indicate how lifestyle interference the physical activity and osteoporosis risk; 4) to compare the results of present study with our 2004 study.
This study was carried out during years 2006-2007. Subjects (n=135) (15% men, 85% women, age 61±13(SD)) who attended to one clinic Kaunas for bone stiffness measure due to metabolic disorders, suspect osteoporosis, participated in present study. The... [to full text]
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FINITE ELEMENT ANALYSIS OF CANCELLOUS BONEWilkerson, Lucas T 01 January 2012 (has links)
A variety of pathologies exist which increase the likelihood of bone fracture. Present methods for determining the fracture risk of a specific patient are based exclusively on the amount of bone present. While the quantity of bone tissue is correlated with strength, it neglects to account for bone’s intricate microarchitecture. To assess the effect of bone quality on strength, a methodology was developed for the structural analysis of cancellous bone biopsies. Thirty biopsies were selected from a pre-existing biopsy bank, and scanned using a SCANCO µCT-40 at a resolution of 30 microns. Cortical bone was removed from the resulting three-dimensional geometry, and the remaining cancellous bone was meshed with solid tetrahedral elements. A linear static uniaxial compression test was performed using ANSYS v14.0 to determine the apparent-level Young’s modulus. The maximum von Mises stress was also investigated, but showed poor convergence with increased mesh density. Consistent with the methodology of Pistoia et al., the failure load was assumed to occur when 2% of the bone volume exceeded 7000 µstrain. The results of the finite element analysis compared favorably with known values for cancellous bone strength.
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Validation of Mechanical Response Tissue Analysis by Three-Point Mechanical Bending of Artificial Human UlnasArnold, Patricia A. 03 June 2013 (has links)
No description available.
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