Clinical trials

The purpose of this supplementation study is to understand how whole food fibers may affect gut microbiota composition and overall health. The investigators will enroll up to 24 people in this study. To be eligible, participants need to be between 18 and 65 years old, have a Body Mass Index of 25 to 35 kg/m², be prediabetic (HbA1c: 5.7 - 6.3), be free of any inflammatory bowel disease or any colon-related disease, be free of wheat allergens or intolerance, and not be pregnant or nursing. If participants have any questions about the criteria, they will ask the investigator consenting them. This is a randomized, cross-over, double-blind, clinical trial (RCT) that will last 12 consecutive weeks in total (4 weeks of treatment A + 4 weeks of washout + 4 weeks of treatment B). The order of the treatments will be randomly assigned before the beginning of the study. If proved right, this study will provide a science-based fiber reason why consumption of whole foods constitutes a better dietary approach than the current practice of adding soluble dietary fiber (inulin) alone to modulate gut microbiota for gut and whole-body health.

The goal of this randomized cross-over trial is to learn about the effect of a single bout of 20-min mindfulness-based high-intensity interval training (MF-HIIT), MF-only, and HIIT-only in relative to sitting rest on executive function (EF) in 10-12 years old children. The main question it aims to answer are: Question 1: Whether a single bout of 20-min MF-HIIT has larger beneficial effect on EF performance than that following a 20-min session of MF-only and HIIT-only in relative to the sitting rest Question 2: Whether a single bout of 20-min MF-HIIT has a larger beneficial effect on brain functioning, as measured by the N2 and P3 components of event-related potential (ER) during EF performance than that following a 20-min session of MF-only and HIIT-only in relative to the sitting rest Participants will visit the laboratory on 5 separate days (\> 2-day washout between days) in which they have not previously participated in structured physical activities. Participants will complete the testing and/or receive treatments below: Day 1: * Kaufman Brief Intelligence Test (KBIT) to assess intelligence quotient * Treadmill-based exercise test to measure cardiorespiratory fitness (maximum oxygen consumption) Days 2-5 * Each day, participants will complete each of the four intervention conditions (MF-HIIT, MF-only, HIIT-only, sitting) * Participants' heart rate and self-reported affect and rating of physical exertion will be measured * Participants will complete a modified flanker task and a task-switching task to assess inhibitory control and cognitive flexibility * Participants will wear an EEG cap to measure the N2 and P3 components of the event-related potential during the inhibitory control and cognitive flexibility performance Researcher will compare the cognitive outcome measures following the MF-HIIT, MF-only, and HIIT-only conditions with the sitting condition to see if MF and HIIT has beneficial effects on children's EF. Further, researcher will compare the cognitive outcome measures following the MF-HIIT compared with MF-only and HIIT-only conditions to see if combining MF with HIIT has greater beneficial effects on children's EF than MF and HIIT alone.

The goal of this randomized controlled trial is to learn about the effect of a 12-week school-based intervention combining mindfulness with high-intensity interval training (MF-HIIT), MF-only intervention, and HIIT-only intervention in relative to sedentary activities on executive function (EF) in 8-12 years old children. The main question it aims to answer is whether a 12-week school-based MF-HIIT intervention has larger beneficial effect on EF performance than that following a 12-week school-based MF-only and HIIT-only in relative to the sedentary activities. Multiple cohorts of participants will be recruited to participate this one-semester study, including the pretest, intervention, and posttest phases. During the pretest phase, participants an their parents will complete the following 1. Kaufman Brief Intelligence Test (KBIT) to assess intelligence quotient 2. Fitnessgram test to assess aerobic capacity, muscle endurance, flexibility, and body mass index 3. Child and Adolescent Mindfulness Measure (CAMM) questionnaire to assess dispositional mindfulness 4. Computerized tasks to assess EF 5. Parent-reported demographic and health information Following the pretest phase, participants will receive the 12-week classroom-based intervention, with the classroom as the intervention unit. Following the intervention and during the posttest phase, participants will complete the fitness, measures, EF measures, and dispositional mindfulness measure again. Researcher will compare the EFn outcome measures following the MF-HIIT, MF-only, and HIIT-only interventions with the sedentary activity intervention to see if MF and HIIT has beneficial effects on children's EF. Further, researcher will compare the EF measures following the MF-HIIT compared with MF-only and HIIT-only interventions to see if combining MF with HIIT has greater beneficial effects on children's EF than MF and HIIT alone.

The goal of this clinical trial is to learn if changing cysteine levels in the diet can influence how the body processes cysteine in Black and White individuals aged 45-75 with a history of non-cancerous polyps. The main questions it aims to answer are: * At the beginning of the study, do Black participants have higher levels of cortisol (a stress hormone) and compounds made from cysteine in their blood when compared to White participants? * Does eating less cysteine lower the body's natural cysteine activity and lead to less gut bacteria that break down cysteine? * Does eating less cysteine lead to less inflammation in the gut and lower levels of markers of inflammation in the blood? Research will compare a high cysteine diet and a low cysteine diet, and each participant will eat both diets. Participants will be in the study for 11 weeks and 2 days. Over the course of the study, participants will: * Eat a high cysteine diet for 3 weeks, and a low cysteine diet for 3 weeks * Eat a moderate cysteine diet for 1 week before each study diet * Complete surveys * Provide blood, stool, and saliva samples * Maintain food logs

The goal of this clinical trail is to learn if the hormone, glucagon-like peptide-1 (GLP-1), is stimulated by slowly digestible carbohydrates (SDCs) in healthy adults. In the current study, researchers will observe the amount of SDC that results in clinically meaningful levels of GLP-1, shown by an increase in feelings of fullness and a decrease in hunger, and how long an elevated level of GLP-1 lasts after starch consumption. Researchers aim to address two questions: What amount of SDC maximizes GLP-1-mediated satiety, and does the impact to satiety continue in a second meal? The overall goal is to maximize ileal-digesting SDC's potential use as a food-based agent for weight loss. Researchers will compare 20, 40, and 60 g of raw corn starch compared to a maltodextrin control on total plasma GLP-1 concentrations, insulin, and blood glucose at baseline and 15, 30, 60, 90, 120, and 180 minutes post-consumption of SDC. Researchers will also measure satiety at baseline, 60, 120, 180 minutes and after a second meal. There will be a total of 4 study visits with a least a 7-day break between visits. At each study visit, participants will: * Consume a randomized test beverage (SDC or maltodextrin) * Receive a blood draw at 7 timepoints over 3 hrs * Take a satiety questionnaire 5 times over 3 hrs * Consume a standardized lunch 3 hrs after the test beverage consumption

This study will examine how different types of milk affect blood sugar and insulin responses after eating. Specifically, the study compares milk that contains only A2 beta-casein protein (A1-free milk) to conventional milk, which contains both A1 and A2 proteins. Participants will complete four study visits in which they will consume different milk-based beverages. These include lactose-containing milk and lactose-free milk followed by a lactose drink given later. Blood samples will be collected over several hours to measure glucose and insulin responses. Breath tests and questionnaires will also be used to assess digestion and gastrointestinal symptoms. The goal of this study is to determine whether milk protein type influences metabolic responses and whether consuming lactose-free milk affects how the body processes lactose when it is consumed later.

This study is designed to understand how different hearing-aid noise-reduction technologies affect a listener's ability to hear speech in noisy environments. Participants will listen to speech at several background-noise levels while trying different processing settings. By comparing performance across these conditions, the study aims to identify which types of noise reduction improve speech intelligibility the most. We expect that some noise-reduction strategies will help listeners understand speech better than others, especially in more difficult listening situations.

The main aim of this study is to investigate differences in rate, extent of change and persistence of the gut microbiota in healthy adult volunteers in response to native chicory inulin. Along with investigating the impact of native chicory on bowl habits, mood and appetite. The two main questions this study aims to answer: * To what extent do differences exist in rate of change over time between individuals in gut microbiota response (Bifidobacterium growth) to native chicory inulin supplementation. * To what extent do differences exist between individuals in persistence of the gut microbiota upon stopping supplementation. The effects of native chicory inulin on gut microbiota response will be compared to a maltodextrin placebo to sure changes in gut microbiota result directly from chicory inulin supplementation. Participants will firstly complete a one-week run-in phase to establish baseline data and will then be allocated to either native chicory inulin or maltodextrin supplementation for 6 weeks. Inulin will be delivered at 12 g/day split into 2 x 6g portions. Maltodextrin will be calorie matched at 6 g/day split into 2 x 3g portions. This will then be followed by a 6 week post-supplementation phase. Fecal and blood samples will be collected regularly throughout all phases for analysis of gut microbiota and compounds of interest. Participants will also record any changes in gastrointestinal sensation, bowel habits and mood in a diary. Changes in appetite sensation will also measured.

The goal of this clinical trial is to learn if a music-based intervention can acutely improve three types of attention (alerting, orientating, executive control) in people with aphasia following a stroke. The main questions it aims to answer are: 1. Is a music based intervention effective at improving attention with someone who has aphasia? 2. Does music-induced changes in attention improve language abilities and quality of life with someone who has aphasia? Researchers will compare a group that listening to music, to listing to an audiobook group, to a group that serves as a control to see if there are changes in attention over time. Participants will: 1. Listen to music or an audiobook for 30 minutes a day for 8 weeks 2. Complete a daily journal about each day's listening experience 3. Complete three testing sessions where attention, language, and quality of life are assessed.

The importance of the gut microbiota for general health has been recently elucidated, but little is known about the impact of different types of nutrients on the gut microbiota. The soluble fiber in cereal by-products, arabinoxylan (AX), is known to be beneficial for generally promoting gut health. However, it is unclear whether consuming rice bran (RB), the source of AX, is equally helpful or better than consuming the extracted form of AX. This study aims to reveal the potential benefit of insoluble cereal bran fiber ingredients by comparing the effect of soluble arabinoxylan fiber alone and the mostly insoluble rice bran fiber, containing arabinoxylan, on intestinal health and gut microbiota. A placebo (maltodextrin) will be used as a control, with no significant changes expected in this group for the evaluated outcomes. Participants will: * Consume two different fiber supplements (soluble arabinoxylan or stabilized rice bran) as well as a placebo (maltodextrin) for 3 weeks each, separated by a 2-week washout period. * Provide blood and stool samples at six different time points. * Complete a food and gastrointestinal symptom diary during the intervention periods.

Food insecurity and low diet quality are persistent problems linked with chronic disease and poor health among limited-resource children and adults using Supplemental Nutrition Assistance Program (SNAP). We have shown nutrition education via adult-focused, direct SNAP-Education (SNAP-Ed) improved household food security by 25% but not adult dietary quality among SNAP-eligible households using a randomized, controlled, longitudinal SNAP-Ed intervention in Indiana. Households experiencing food insecurity often reserve food considered "healthful" for children, so child dietary quality improvement may precede that observed among adults when household food security improves. This study will determine the effect of adult-focused direct SNAP-Ed on child dietary quality and household food security using a longitudinal randomized, controlled SNAP-Ed intervention. Assessment will include repeated 24-hour dietary recalls to determine usual intake, the U.S. Household Food Security Survey Module, and behavior data from before and after the 10-week "intervention period," and 1 year later, after which the control group will receive the intervention. Low-income participants (n=275) from Indiana will be recruited following SNAP-Ed protocol. Results of the study will inform the creation of supplementary on-demand SNAP-Ed educational material focused on improving healthful dietary intake for children and adults in situations of food insecurity in households with children. Education on modeling healthy attitudes and behaviors, planning and preparing family meals, and dietary shortfalls as informed by the results and previous evidence will be included and evaluated. The study aligns with the goals of USDA to increase food security and this RFP to improve healthful behaviors, food quality and nutrition.

Groundwater in Martinsville, IN, is contaminated by volatile organic compounds (VOCs), tetrachloroethylene (PCE) and trichloroethylene (TCE). Indoor air in some residential and commercial buildings is also contaminated with PCE and TCE. This study is being conducted to better understand the impact of low-level exposures to these compounds on community members' health. Data collected in this study will be used to help the community identify a course of action.

The goal of this clinical trial is to investigate how iron status and heavy bleeding during the menopausal transition affect women's cognitive function and quality of life. The main questions it aims to answer are: * What is the association between iron status, cognitive function, mood, quality of family relationships, and quality of life in perimenopausal women? * How does iron repletion, via supplementation, affect cognitive function, mood, quality of family relationships, and quality of life in perimenopausal women? The investigators will compare the effect of iron supplements to a placebo (gelatin capsule) to see if iron supplements could improve iron status, cognitive function, mood, quality of family relationships, and quality of life of iron-deficient and/or anemic women undergoing the menopausal transition. Each participant will: * Make 2 visits (about 2 hours each - baseline and endline) to the Clinical Research Center at Purdue * Make a very brief visit at midpoint (about 10 minutes) for a checkup * Take a daily study supplement or placebo for 4 months

This project focuses on developing a novel treatment for sentence production and comprehension in aphasia, using implicit priming. First set of experiments will aim examine which learning conditions are most effective in creating maximal training gains. Then, in a later study, the investigators will develop and test the efficacy of a novel treatment study based on findings from the first set of the studies.

This study aims to test whether home-based heat therapy (HT) can improve the health of older adults with type 2 diabetes (T2D). T2D is common in older adults and can lead to severe issues such as heart disease, disability, and early death. While regular exercise is known to help manage T2D, many people with the condition find it difficult to stay active. This study explores HT as a simple, non-invasive treatment that may offer similar benefits. Participants will wear special leg sleeves that deliver heat to their legs for 90 minutes each day at home over 12 weeks. The study\'s primary goal is to assess whether HT treatment at home is feasible and safe to use. We hypotesize that people with diabetes who receive heat therapy will have better blood sugar control, stronger legs, less body fat, and improved ability to walk, along with lower blood pressure. If successful, HT could offer a new option for people with T2D to manage their condition, especially for those who struggle with regular exercise. This research could lead to larger studies and help provide a practical way to improve health and quality of life for older adults with diabetes.

This study will assess the effects of eating whole grain foods versus refined grain foods with different amounts of added sugar. It is hypothesized that a diet including grain products will have beneficial effects on taste hedonics, appetite, food/energy intake, body weight, blood pressure, acute and chronic glycemia and acute and chronic lipemia compared to customary diets controlling for added sugars, saturated fats and sodium.