Aim: To test the interactive effects of the constructs of Modified Social Learning Theory (MSLT) in relation to predicting health behaviour in Type 2 Diabetes. Methods: The study is mixed methods and employs an exploratory sequential design. Qualitative Phase: (N=12) Semi-structured interviews with adults with insulin-treated type 2 diabetes, explored how beliefs and values influence self-management behaviour. Interim Phase: Thematic analysis allowed development of an adapted Health Value Measure. Quantitative phase: (N=107) Valid questionnaires measured Health Value, Health Locus of Control (HLC) and Self-efficacy (SE). Health Value was measured pre and post diagnosis in order to compare any changes with time. Anxiety and depression was controlled for using the Hospital Anxiety and Depression(HAD) scale. Five subscales measured diabetes outcome behaviour: general diet, specific diet, exercise, blood sugar and foot care. Hierarchical Multiple Regression(HMR) analyses consisted of four blocks, including three two-way interaction terms and one three-way interaction term to test the interactive effects of the three-predictor variables on outcome behaviours. ANOVA’s were conducted in an effort to add support to HMR results. Results: The interviews suggest that people may hold terminal (beliefs about desired end states)/instrumental health values (beliefs about desired modes of action) pre-diagnosis but these are mainly instrumental post-diagnosis in order to meet their new needs and maintain quality of life. The qualitative data also drew attention to the way in which LOC and SE beliefs impact on behaviour. Additionally, differing dimensions of various emergent themes highlight the demands Type 2 diabetes places on a person and how this influences beliefs and values. Interim phase results resulted in the new items being removed from the adapted health value measure prior to the quantitative data analysis, as item 5 was deemed problematic. Sensitivity analysis was carried out to increase the robustness of the quantitative findings due to removing 29 cases with missing data from Dataset 1. Dataset 1 includes 78 complete cases and Dataset 2 contains 107 cases, 29 of which had missing values and were replaced using regression imputation. HMR analyses produced significant results that support MSLT when the three-way interaction variable was added to block 4. ANOVA results produced minimum support for MSLT. Conclusion: Support for MSLT has been found and can be used to inform interventions to change self-management behaviours of patients with poor diabetes control. Change in health value orientation post-diagnosis purports further investigation, as it is supported by qualitative results but not quantitative.

Background: Type 2 diabetes mellitus (T2DM) is a complex health condition that impacts multiple organ systems and contributes to both acute and chronic health problems. In the United States (U.S.), T2DM is a growing health concern with increasing prevalence among both adult and pediatric populations (American Diabetes Association [ADA], 2015; Dea, 2011). Developing a comprehensive plan of care that incorporates a multifaceted treatment and prevention plan is necessary to address this growing health concern and reduce overall morbidity and mortality. Problem: The Edmund Primary Care (EPC) practice data for routine annual diabetic foot exams, annual eye exams, annual urine microalbumin, smoking cessation education and recommendations for pneumococcal polysaccharide do not meet the ADA (American Diabetes Association, 2015) recommendations for patients with T2DM.Design: Quality improvement (QI) project applying the Plan-Do-Study-Act (PDSA) cycle to develop a process change to improve diabetic preventative care measures for hemoglobin A1C, urine microalbumin, diabetic foot exams, and optometry referrals. Setting: A small, nurse practitioner owned, family practice clinic targeting patients 18 years and older with a diagnosis of T2DM.Intervention: A fishbone diagram to conduct a root cause analysis led to identification of key factors contributing to the problem. A comprehensive process change integrating a Diabetic Assessment Flow Sheet (DAFS) and diabetic foot exam sheet was developed to address the problem. Expected Outcome: Increase in rates of completion to at least 90% over eight weeks. Results: Analyzed with run charts demonstrating an increase in rates of completion to 100% for A1C, urine microalbumin, diabetic foot exams, and optometry referrals. A positive percent of change for each measure is as follows: A1C 7%; urine microalbumin 43%; diabetic foot exams 150%; and referrals to optometrist 43%. Significance: This QI project emphasizes the importance of implementing a system to evaluate the quality of care being delivered. It also highlights the usefulness of the PDSA cycle as a method to implementing quality improvement measures in health care. Lastly, this QI project demonstrated the effectiveness of flow sheets in improving the quality of care delivered to patients with T2DM.

Obesity increases the risk for the development of cardiovascular disease, type 2 diabetes and other co-morbid conditions. Type 2 diabetes also is often associated with excessive visceral abdominal fat. Weight loss in obese individuals decreases the risk for developing the co-morbid conditions. Individuals with type 2 diabetes often have a greater difficulty in controlling these complications compared to individuals without type 2 diabetes. The purpose of this study was to evaluate adherence to a medically-supervised low-energy diet (LED) weight loss program and changes in body composition and metabolic parameters after weight loss in women with and without type 2 diabetes. Subjects consisted of Caucasian women, between the ages of 40 to 65 years, with BMIs between 30 and 45 kg/m2. There was no significant difference in BMI between the groups at study initiation (38.1 kg/m2, diabetics (DM) and 36.0 kg/m2, non-diabetics (NDM), p=0.2314). All subjects participated in the HMR Program for 16 weeks. Twenty-nine subjects completed the weight loss phase (18 diabetics, 11 non-diabetics) and were evaluated for change in weight, body composition, and blood parameters. Data were analyzed by repeated-measures ANCOVA and students t-tests using SAS version 8.02. DM and NDM lost 11.7% and 16% of body weight, respectively (p=0.6474). Results indicate DM has more total lean tissue (p=0.004), more total body fat (p=0.04), more total abdominal tissue (p=0.001), more visceral adipose tissue (p=0.001) and lost less percent body fat (p=0.04) than NDM after 16 weeks of weight loss. After weight loss there was no significant difference in leptin, ghrelin or adiponectin levels. DM had greater insulin (p=0.05), HOMA-IR (pandlt;0.0001), glucose (pandlt;0.0001), HbA1c (pandlt;0.0001), resistin (p=0.04) and PAI-1 (p=0.02). There were no differences after weight loss in lipid levels, blood pressure, diet compliance or exercise. The data show that medically-supervised LEDs are safe and effective for treating obesity in individuals with type 2 diabetes. Cardiovascular risk factors improved in both NDM and DM subjects with weight loss. The findings also suggest that insulin and metabolically dysfunctional lean tissue may play a critical role in the complex axes affecting changes in body composition and inflammation in individuals with type 2 diabetes.

Type 2 diabetes (T2DM) has reached epidemic levels worldwide during the past two decades. It affects nearly 26 million adults in the U.S. Advances in both the treatments for T2DM and guidelines for its optimal management are extensive. Despite these advances, barely half of type 2 diabetics achieve recommended glycemic targets. Specific Aims: The specific aims were to: Describe the available research on clinical inertia and interventions that have been implemented to reduce it. Analyze various behavioral theories that explain and predict self-care practices in diabetes in order to develop a conceptual model on which to base an investigation of predictors of readiness to initiate insulin therapy in type 2 diabetics. Determine predictors of readiness to initiate insulin therapy in patients with T2DM when oral medications fail to control hyperglycemia using the conceptual model based on Self-Determination Theory (SDT) as a framework. Results: A review of research articles published from 1990 to 2010 concluded that clinical inertia of primary care providers treating T2DM resulted in a majority of patients experiencing unnecessary chronic uncontrolled hyperglycemia. Behavioral theories were analyzed for their ability to predict self-care behaviors in type 2 diabetics. A conceptual model was developed based on the major constructs of SDT in order to guide the design of study to investigate predictors of readiness to begin insulin therapy in T2DM. Finally, a descriptive, correlational study was performed to determine readiness to initiate insulin therapy in patients with T2DM when oral medications fail to control hyperglycemia. Results of the study revealed that participants who had a friend or family using insulin were 5.5 times more likely to rate their readiness to initiate insulin as high than those who had neither (p=.020). In addition, those with greater negative beliefs and attitudes toward insulin therapy were more likely to rate their readiness to initiate insulin as low (p=.012). A majority (58%) of participants rated their readiness to begin insulin therapy as immediate if it would give them better control over their hyperglycemia. The study also confirmed findings from previous studies that clinical inertia was present in this setting.

Dietary saturated fat intake contributes to diabetes and cardiovascular disease, as shown in numerous animal and human studies. However, the hypothesis that stearic acid, a saturated fat, has beneficial effects on these conditions has not been adequately tested. Leptin receptor deficient mice (db/db) and wild-type mice were fed either chow or a high fat diet enriched in either stearic acid or oleic acid for ten weeks. The progression of diabetes was evaluated with blood glucose, insulin, and metabolic parameter measurements. At the conclusion of the study, pancreatic islet organization was examined, and blood, liver and feces were assayed for fatty acid content. The stearic acid enriched diet prevented increases in blood glucose levels independently of weight loss in db/db mice compared to an oleic acid or chow diet. Diabetic mice fed stearic acid maintained insulin responsiveness and pancreatic islet organization compared to the db/db mice fed chow and oleic diets. The islet organization of the stearic acid fed mice did not change over the course of the study and was similar to that of wild-type mice fed the same diet. Conversely, diabetic mice fed oleic acid and chow diets had decreased insulin responsiveness and disorganized islets. Stearic acid fed db/db mice had high fecal fat content and caloric intake calculations indicated low absorption of this fat. Switching to stearic acid after prolonged hyperglycemia had a rescue effect on blood glucose levels. After feeding diabetic and wild-type mice standard chow diets for 6, 8, and 10 weeks to establish hyperglycemia, mice switched to a high fat diet enriched in stearic acid, but not one enriched in oleic acid diet, had significant reductions in blood glucose levels. The ability of a stearic acid enriched high fat diet to slow the progression of diabetes and reverse hyperglycemia in db/db mice argues that risks and benefits of fats in the diet depend on the chemical structure, rather than the chemical class, of fats ingested. The beneficial effect of stearic acid appears to be associated with a decreased absorption of dietary fat.

Given the high and increasing social, health and economic costs of type 2 diabetes, early diagnosis and prevention are critical. Insulin sensitivity and insulin secretion are important etiological factors of type 2 diabetes and are used to define an individual’s risk or progression to the disease state. The dynamic insulin sensitivity and secretion test (DISST) concurrently measures insulin sensitivity and insulin secretion. The protocol uses glucose and insulin boluses as stimulus, and the participant response is observed during a relatively short protocol via glucose, insulin and C-peptide assays. In this research, the DISST insulin sensitivity value was successfully validated against the gold standard euglycaemic clamp with a high correlation (R=0.82), a high insulin resistance diagnostic equivalence (ROC c-unit=0.96), and low bias (-10.6%). Endogenous insulin secretion metrics obtained via the DISST were able to describe clinically important distinctions in participant physiology that were not observed with euglycaemic clamp, and are not available via most established insulin sensitivity tests. The quick dynamic insulin sensitivity test (DISTq) is a major extension of the DISST that uses the same protocol but uses only glucose assays. As glucose assays are usually available immediately, the DISTq is capable of providing insulin sensitivity results immediately after the final blood sample, creating a real-time clinical diagnostic. The DISTq correlated well with the euglycaemic clamp (R=0.76), had a high insulin resistance diagnostic equivalence (ROC c-unit=0.89), and limited bias (0.7%). These DISTq results meet or exceed the outcomes of most validation studies from established insulin sensitivity tests such as the IVGTT, HOMA and OGTT metrics. Furthermore, none of the established insulin sensitivity tests are capable of providing immediate or real-time results. Finally, and most of the established tests require considerably more intense clinical protocols than the DISTq. A range of DISST-based tests that used the DISST protocol and varying assay regimens were generated to provide optimum compromises for any given clinical or screening application. Eight DISST-based variants were postulated and assessed via their ability to replicate the fully sampled DISST results. The variants that utilised insulin assays correlated well to the fully sampled DISST insulin sensitivity values R~0.90 and the variants that assayed C-peptide produced endogenous insulin secretion metrics that correlated well to the fully-sampled DISST values (R~0.90 to 1). By taking advantage of the common clinical protocol, tests in the spectrum could be used in a hierarchical system. For example, if a DISTq result is close to a diagnostic threshold, stored samples could be re-assayed for insulin, and the insulin sensitivity value could be ‘upgraded’ without an additional protocol. Equally, adding C-peptide assays would provide additional insulin secretion information. Importantly, one clinical procedure thus yields potentially several test results. In-silico investigations were undertaken to evaluate the efficacy of two additional, specific DISTq protocol variations and to observe the pharmacokinetics of anti-diabetic drugs. The first variation combined the boluses used in the DISTq and reduced the overall test time to 20 minutes with only two glucose assays. The results of this investigation implied no significant degradation of insulin sensitivity values is caused by the change in protocol and suggested that clinical trials of this protocol are warranted. The second protocol variant added glucose content to the insulin bolus to enable observation of first phase insulin secretion concurrently with insulin sensitivity from glucose data alone. Although concurrent observation was possible without simulated assay noise, when clinically realistic noise was added, model identifiability was lost. Hence, this protocol is not recommended for clinical investigation. Similar analyses are used to apply the overall dynamic, model-based clinical test approach to other therapeutics. In-silico analysis showed that although the pharmacokinetics of insulin sensitizers drugs were described well by the dynamic protocol. However, the pharmacokinetics of insulin secretion enhancement drugs were less observable. The overall thesis is supported by a common model parameter identification method. The iterative integral parameter identification method is a development of a single, simple integral method. The iterative method was compared to the established non-linear Levenberg-Marquardt parameter identification method. Although the iterative integral method is limited in the type of models it can be used with, it is more robust, accurate and less computationally intense than the Levenberg-Marquardt method. Finally, a novel, integral-based method for the evaluation of a-priori structural model identifiability is also presented. This method differs significantly from established, derivative based approaches as it accounts for sample placement, measurement error, and probable system responses. Hence, it is capable of defining the true nature of identifiability, which is analogous, not binary as assumed by the established methods. The investigations described in this thesis were centred on model-based insulin sensitivity and secretion identification from dynamic insulin sensitivity tests with a strong focus on maximising clinical efficacy. The low intensity and informative DISST was successfully validated against the euglycaemic clamp. DISTq further reduces the clinical cost and burden, and was also validated against the euglycaemic clamp. DISTq represents a new paradigm in the field of low-cost insulin sensitivity testing as it does not require insulin assays. A number of in-silico investigations were undertaken and provided insight regarding the suitability of the methods for clinical trials. Finally, two novel mathematical methods were developed to identify model parameters and asses their identifiability, respectively.

Placental insufficiency-induced intrauterine growth restriction (IUGR) increases risk of mortality and morbidity in newborn infants and domestic animals. IUGR fetuses are typically exposed to prolonged hypoxemia, hypoglycemia, and hypercatecholaminemia, which results in perinatal pancreatic β-cell dysfunction. Recent evidence indicates that chronic exposure to norepinephrine in utero suppresses insulin secretion through α2-adrenergic receptors (ARs), but if the adrenergic actions are blocked compensatory hyper insulin secretion response is observed in the IUGR sheep fetus. In the current studies, we demonstrate that chronic NE exposure alone can produce the compensatory enhancement of β-cell responsiveness following termination of a chronic NE infusion. In the fetus NE was continuously infused at 1-4 μg/min for seven days starting at 131 days of gestational age (term = 145 days). During treatment, NE infused fetuses had higher (P < 0.05) plasma NE concentrations and lower (P < 0.01) insulin concentrations than vehicle infused control fetuses. Glucose stimulated insulin secretion (GSIS), which measures β-cell function, prior to NE treatment was not different between treatments. However, insulin concentrations during hyperglycemic steady state period of GSIS studies and area under the curve of glucose-potentiated arginine-induced insulin secretion were higher (P < 0.01) than control values and this augmentation was confirmed at 3 hours, 24 hours, and five days in NE-infused fetuses after discontinuing the infusion. Pancreatic islets isolated within 10 hours post NE infusion had lower (P < 0.05) mRNA expression of α1D (58%), α2A (43%), α2C (42%), α1 (67%) adrenergic receptors (ARs), and uncoupling protein 2 (40%) compared to islets from controls. Isolated islets from NE-infused fetuses 5 days after NE treatment had lower (P < 0.05) inhibitory responsiveness from NE and a greater (P < 0.05) maximal insulin release with glucose simulation in static incubations compared to controls. These findings show that following chronic NE exposure insulin secretion responsiveness was augmented and was coupled with desensitized adrenergic signaling. Moreover, this compensatory β-cell enhancement persists for days indicating chronic NE exposure permanently alters β-cell responsiveness.

Bakgrund: Diabetes mellitus typ 2 är ett globalt problem som blir allt vanligare. Den nödvändiga egenvården kräver mycket av diabetes typ 2-patienten, och vårdpersonalen behöver adekvat kompetens för att kunna stötta dessa individer på bästa sätt. Syfte: Att undersöka patienters upplevelse av egenvård vid diabetes mellitus typ 2. Metod: En litteraturöversikt har gjorts baserat på elva originalartiklar tillgängliga på databaserna CINAHL Complete och PubMed. Artiklarna analyserades enligt Friberg, och teman och subteman skapades. Resultat: Resultatet presenteras i fyra teman. Det första temat är Patienters upplevelse av kostförändringar och har tre subteman: Kunskap och motivation, Kostförändringars inverkan på livskvalitet samt Egenvårdskontroll. Två andra teman som presenteras är Upplevelsen av läkemedelsbehandling och Upplevelsen av egenvård genom motion. Det fjärde och sista temat är Sjukvårdens roll i egenvården och presenteras genom tre subteman: Upplevelsen av gruppbaserad utbildning, Behov av stöd i egenvården samt Upplevelsen av mötet med sjukvården. Diskussion: Huvudfynden i resultatet analyserades för att se likheter och olikheter i de upplevelser som patienterna beskrivit. Dessa upplevelser diskuteras under två rubriker; Stödjande faktorer för egenvård och Försvårande faktorer för egenvård. Resultatet diskuterades utifrån Dorothea Orems egenvårdsteori samt konsensusbegreppet hälsa. / Background: Type 2 diabetes mellitus is a global problem that is increasing worldwide. The necessary self-management is demanding a lot of the type 2 diabetes-patient, and the health professionals needs adequate competence to be able to support these individuals in the best way. Aim: To examine patients' experience of self-management in type 2 diabetes mellitus. Method: A literature review has been made based on eleven original articles available on the databases CINAHL Complete and PubMed. The articles were analysed according to Friberg, and themes and subthemes were created. Results: The result is presented in four themes. The first theme is Patients´ experience of dietary changes and has three subthemes: Knowledge and motivation, Dietary changes and its impact on the quality of life and Self-management control. Two other themes are presented as The experience of drug treatment and The experience of self-management through physical activity. The fourth and last theme is The role of healthcare in self-management and is presented through three subthemes: The experience of group based education, The need of support in self-management and The experience of the meeting with the healthcare. Discussion: The main findings in the result were analysed to discover similarities and differences within the experiences as described by patients. These experiences were then discussed under two subtitles; Supporting factors for self-management and Aggravating factors for self-management. The result was discussed from the theory of self-care by Dorothea Orem and the consensus concept of health.

Background: Type 2 diabetes mellitus (T2DM) is a welfare disease increasing with such a high rate that it, in popular speech, is being called epidemic. To prevent the spread of this disease, future health care workers are in need of a deeper, science-based education. Purpose: The aim of this study is to research the knowledge about T2DM regarding risk factors, nutrition, activity and foot hygiene among public health students at Thammasat University in Bangkok, Thailand. Method: A cross-sectional study was made using a questionnaire. A convenience sampling of public health students were approached and 121 decided to participate. Results: The majority of the students knew that obesity and an unhealthy diet (containing a high amount of fat, sugar and fast food) was correlated with T2DM and associated with negative outcomes of the disease. The students were uncertain or had less knowledge that smoking is a risk factor (79%). The greater part of the participants (73%) thought that people with T2DM should let their feet air dry. 74% of the respondents underestimated the amount of time that was needed to exercise per week to achieve positive results and 63% of the students were dissatisfied with their education regarding T2DM. Conclusion: Although the students overall had good knowledge about T2DM, they also showed a lot of uncertainty and insufficient knowledge in several questions. This was especially distinguished in the questions regarding activity, foot hygiene and risk factors. / Bakgrund: Typ 2 diabetes mellitus (T2DM) är en välfärdssjukdom som ökar i så snabb takt att den i folkmun kallas för en epidemi. För att förhindra spridningen av sjukdomen behöver framtida vårdpersonal en djupare, evidensbaserad grundutbildning. Syfte: Syftet med denna studie var att undersöka kunskapen kring T2DM, med avseende på riskfaktorer, nutrition, aktivitet och fothygien bland studerande folkhälsovetare vid Thammasat University i Bangkok, Thailand. Metod: Ett bekvämlighetsurval på studerande folkhälsovetare gjordes, varav 121 av 136 studenter deltog. Enkäter användes i denna studie. Resultat: Majoriteten av eleverna visste att fetma och en ohälsosam kost (innehållande hög fetthalt, socker och snabbmat) var korrelerat med T2DM och associerat med negativa konsekvenser av sjukdomen. Majoriteten av studenterna visste inte att rökning var en riskfaktor (79%). Större delen av deltagarna (73%) tyckte att personer med T2DM skulle låta fötterna lufttorka. 74% av respondenterna underskattade mängden fysisk aktivitet som behövdes varje vecka för att uppnå positiva resultat och 63% av eleverna var missnöjda med sin utbildning avseende T2DM. Slutsats: Även om eleverna i allmänhet hade goda kunskaper om T2DM visade de också en hel del osäkerhet och otillräcklig kunskap i flera frågor. Detta särskilt i frågorna gällande aktivitet, fothygien och riskfaktorer.

Prevalence of type 2 diabetes mellitus (T2DM) is still rising and even so in the juvenile population. Obesity is highly associated with increased risk for developing T2DM. The development has been related to elevated fasting concentrations of the pancreatic islet hormones insulin and glucagon as well as to an increase in plasma lipids that occurs during obesity. Specifically, research has indicated that chronic exposure to high levels of saturated free fatty acids cause dysfunction in islet alpha- and beta-cells. Fatty acids can affect islet cells by various mechanisms one of which is the G-protein coupled receptor FFAR1/GPR40. The role of the receptor in the effects of fatty acids on pancreatic islet-cell function is not clear. The aim of this thesis was to clarify the role of FFAR1 in how fatty acids, and more specifically the long-chain saturated fatty acid palmitate, affect insulin and glucagon secretion. In children and adolescents with obesity elevated fasting levels of insulin and glucagon were positively correlated with lipid parameters. Specifically, plasma triglycerides and free fatty acids were positively correlated with insulin and glucagon at fasting as well as with visceral adipose tissue volume. Elevated glucagon levels at fasting were associated with worsening of glucose tolerance in the same population. In in vitro studies of isolated human islets palmitate stimulated basal insulin and glucagon secretion as well as mitochondrial respiration at fasting glucose levels. The effect was mediated by FFAR1 and fatty acid beta-oxidation. At higher glucose concentrations the receptor was involved in the potentiation of insulin secretion from isolated human islets and insulin-secreting MIN6 cells. Furthermore, we found that the effects of palmitate on hormone secretion were associated with enhanced mitochondrial respiration mediated by FFAR1 Gαq signaling and PKC activity as well as increased intracellular metabolism induced by the fatty acid. When islets were exposed to palmitate for long time periods and in the presence of FFAR1 antagonist, normalized insulin and glucagon secretion during culture and insulin response to glucose after culture were observed. In MIN6 cells chronic palmitate treatment increased mitochondrial uncoupling irrespective of FFAR1 involvement. However, FFAR1 antagonism during palmitate exposure resulted in elevated respiration and reduced apoptosis. In conclusion, children and adolescents with obesity have elevated fasting concentrations of insulin and glucagon that correlate with free fatty acids and fatty acid sources. High glucagon levels are linked to worsening of glucose tolerance in these subjects. In vitro the combination or synergy of FFAR1 activation and intracellular metabolism caused by palmitate is decisive for both the short-term enhancement effects and the negative chronic effects on insulin and glucagon secretion.