Insulin Resistance Clinical Trials

The purpose of this study is to examine the hypothesize that 4 weeks of sympathetic nerve activity (SNA) inhibition (oral clonidine) will cause a significant reduction in circulating blood concentrations and endothelial cell expression of inflammatory markers (e.g., TNF-α, IL-6). Our study is a prospective study using a randomized, double-blinded design to test 4 weeks of SNA blockade (oral clonidine) compared with a BP-lowering control condition (diuretic, hydrochlorothiazide) or a placebo. Read Less

The goal of this clinical trial is to test the effect of 12 weeks of 1.5 cups per day of fresh mango on glucose control, insulin resistance, lipids, inflammation, oxidation and body composition in individuals with prediabetes. The main questions it aims to answer are: * What is the effect of 1.5 cups per day of fresh mango over 12 weeks on indicators of glycemic control including fasting glucose and HgbA1c? * What is the effect of 1.5 cups per day of fresh mango over 12 weeks on fasting blood insulin and insulin resistance (HOMA-IR)? * What is the effect of 1.5 cups per day of fresh mango over 12 weeks on lipids including LDL-cholesterol, total cholesterol, HDL-cholesterol and triglycerides? * What is the effect of 1.5 cups per day of fresh mango over 12 weeks on oxidative stress including oxidized LDL-cholesterol and 8-iso-PGF2-alpha? * What is the effect of 1.5 cups per day of fresh mango over 12 weeks on markers of inflammation including c-reactive protein, e-selectin, ICAM, VCAM, TNF-alpha and IL-beta? * What is the effect of 1.5 cups per day of fresh mango over 12 weeks on percent body fat, fat mass, and lean mass? Participants will be asked to: * Consume 1.5 cups of mango per day for 12 weeks, take a 4 to 8 week break, and then avoid consuming mangos for 12 weeks * Attend a prerandomization clinic prior to study * Attend three (3) clinics where blood will be drawn during weeks 0, and 12 of the first phase and last week of the second phase of the study * Attend eight (8) clinics where anthropometric measurements (height, weight, body composition) will be conducted and interaction with study clinicians will occur during weeks 0, 4, 8, 12 of each phase of the study * Complete questionnaires and surveys in person and remotely, including six (6) 24-hour dietary recalls. Researchers will compare the 12 weeks participants consume mango to the 12 weeks the participants are not consuming mango to see if there are differences in glycemic indicators, insulin resistance, lipids, inflammation, oxidation and body composition between the two time periods. Read Less

The purpose of this study is to examine whether weight reduction decreases intramyocellular (IMCL) and hepatic lipid content, and improves insulin sensitivity of muscle and fat tissue in people who are insulin resistant and have a family history of type 2 diabetes. Hepatic mitochondrial oxidation will be assesses using a 3 hour triple tracer study (D7 glucose, 3-13C lactate and 13C4 beta-hydroxybutyrate). Read Less

The overall purpose of this study is to learn more about the metabolic effects of angiotensin-(1-7) in the insulin resistant state associated with obesity. Pharmacologic approaches to increase angiotensin-(1-7) levels or its actions are currently in development for treatment of metabolic-related diseases such as obesity and type II diabetes, based on findings from animal studies. It is unclear if this peptide contributes to the regulation of metabolism in humans. The investigators will test if angiotensin-(1-7) infusion can improve insulin sensitivity measured by hyperinsulinemic-euglycemic clamp methods in individuals with obesity and insulin resistance. The investigators will also examine for changes in blood pressure and related hemodynamic and hormonal changes following angiotensin-(1-7) infusion. Read Less

Skeletal muscle metabolic health is critical for mobility and an underrecognized target of metabolic acidosis in chronic kidney disease. Impaired muscle mitochondrial metabolism underlies poor physical endurance increasing the risk of mobility disability. The proposed project will use precise in vivo tools to study the pathophysiology of poor physical endurance in a clinical trial treating metabolic acidosis among persons living with chronic kidney disease. Read Less

This research study collects health-related information and blood samples to better understand how body composition, lifestyle habits, and diet influence meta-inflammatory monocytes (MiMos) in adolescents. The hypothesis of this study is that adolescents at risk for metabolic disease have enhanced MiMo related activities leading to insulin resistance. Read Less

The primary aim of this study is to evaluate if a single bout of AM vs PM resistance exercise has different effects on insulin sensitivity and sleep. A randomized cross-over trial be used to compare resistance exercise at two different times of the day. Each condition will take place in a laboratory setting. Each condition will consist of exercise, overnight sleep, and oral glucose tolerance tests the following day. The AM exercise will occur \~1.5 hours after habitual wake, and PM exercise will occur \~11 hours after habitual wake. After a 2-6 week washout, participants will complete the other condition. The hypothesis is that PM exercise will be more beneficial than AM exercise in improving insulin sensitivity. This study could identify if there is a better time of day to perform resistance exercise to decrease risk of developing Type 2 Diabetes Mellitus. Read Less

The primary goal of this study is to determine the dose of fatty acids that acutely induces mild insulin resistance in healthy volunteers. We hypothesize that a low-dose of fatty acid infusion (Intralipid/heparin) will cause a mild insulin resistance. The dose of fatty acid infusion that reliably causes mild insulin resistance will be selected for use in future studies. Read Less

Background: About 40 percent of adults and 20 percent of adolescents in the U.S. have a body mass index over 30 kg/m2. Being overweight may lead to a state of low-level inflammation. This may cause health problems. Researchers want to see if an anti-inflammatory medicine can help. Objective: To learn if colchicine can improve metabolism in people who have high body weight, increased inflammation, and high insulin in the blood but who have not yet developed high blood sugar. Eligibility: People aged 12 and older with high body weight who may have increased inflammation and high insulin in the blood. Healthy adult volunteers are also needed. Design: Participants will be screened with the following: Medical history Physical exam Fasting blood tests Urine tests Electrocardiogram Dual energy x-ray absorptiometry (They will lie on a table while a camera passes over their body.) Stool sample and 24-hour food diary (optional) Participants will have 3 study visits and 3 phone check-ins. At visits, they will repeat some screening tests. Healthy volunteers will have the baseline visit only. They will not get the study drug. At the baseline visit, participants will have an Oral Glucose Tolerance Test (OGTT). For this, they will drink a sweet liquid and then give blood samples. They will get a 12-week supply of the study drug or placebo to take daily by mouth. Participants will have study visits 6 weeks and 12 weeks after they started taking the study drug. At the 12-week visit, they will repeat the OGTT. Participation will last for 3 (Omega) to 4 months. ... Read Less

Once written consent is obtained, the participant will be provided with an accelerometer to be worn for 7 days to assess current physical activity levels. Subjects will be provided with a standardized diet (55/15/30% CHO/PRO/FAT) prior to collection of pre-intervention data of insulin sensitivity. Individuals will then participate in an 8-week electrical stimulation intervention (30min/day, 3x/week) and randomized into placebo/control, NMES, resistance training combined with NMES (RT +NMES), or resistance training (RT) group (n=15 per group), followed by collection of post-intervention data. The control group will receive electrical stimulation up to sensory level, the NMES group will receive stimulation up to tolerable intensity to induce visible muscle contraction, the RT+ NMES will receive stimulation up to tolerable intensity during resistance training, and the RT group will only receive exercise training. Pre-and post-intervention data includes measurements for body composition, resting metabolic rate, VO2max, insulin sensitivity, and comprehensive blood work. Read Less

The investigators are doing this study to learn more about how to prevent type 2 diabetes in teenage girls. The purpose of this study is to find out if taking part in a cognitive-behavioral therapy group, exercise training group, or a combination of cognitive-behavioral therapy and exercise training groups, decreases stress, improves mood, increases physical activity and physical fitness, and decreases insulin resistance among teenagers at risk for diabetes. Read Less

The goal of this study is to learn about how the hormone insulin controls blood sugar in a variety of people. The main question it aims to answer is about how much insulin the body actually needs to maintain a normal blood sugar level. Participants will be asked to come in for a one-day study visit in which they will undergo a "graded insulin suppression test" ("GIST"). The GIST involves intravenous (into the vein) infusions of octreotide, a medication that turns off the body's own production of insulin, as well as replacement of insulin at two different levels (low and high), with or without replacement of glucagon, and glucose (sugar). The study investigators will check blood sugar levels every few minutes during the procedure to determine the effect of the two different insulin levels. This study will evaluate the GIST in both healthy volunteers and those at higher risk for type 2 diabetes. Read Less