53 Clinical Trials for Various Conditions
The purpose of the study is to learn about the effect of insulin pumps on sleep in pediatric patients with type 1 diabetes and their caregivers. We are hoping to find out if insulin pumps improve sleep, worsen sleep, or have no effect at all. We are hoping to also explore the relationship between insulin pumps, sleep, and overnight blood sugar control. Your information will not be stored and used for future research. The goal of this observational study is learn about the effect of insulin pumps on sleep in pediatric patients with type 1 diabetes and their caregivers. The main questions it aims to answer are: Do insulin pumps improve sleep, worsen sleep or have no effect at all? What is the relationship between insulin pumps, sleep, and overnight blood sugar control? Participants will be asked to: * Complete questionnaires regarding demographic data and diabetes history. * Complete surveys regarding sleep quality before and after starting an insulin pump. * Wear a FitBit during sleep for 2 weeks and fill out daily sleep diaries over a 2 week period prior to starting an insulin pump. After 1-2 months after initiation of an insulin pump, participants will be asked again to: * Complete surveys regarding sleep quality * Wear a FitBit during sleep for 2 weeks * Fill out daily sleep diaries over the same 2 week period.
The goal of the 4T program is to implement proven methods and emerging diabetes technology into clinical practice to sustain tight glucose control from the onset of type 1 diabetes (T1D) and optimize patient-reported and psychosocial outcomes. The investigators will expand the 4T (Teamwork, Targets, Technology, and Tight Control) program to all patients seen at Stanford Pediatric Diabetes Endocrinology as the standard of care. Disseminating the 4T program as the standard of care will optimize the benefits of diabetes technology by lowering HbA1c, improving PROs, and reducing disparities.
The purpose of this study is to collect clinical data to support a 7-day wear of the Extended Wear Infusion Set (EWIS). Participants will be asked to: 1. Wear the EWIS for up to 7 consecutive days for 12 consecutive wear periods 2. Perform blood glucose and ketone measurements if continuous glucose meter is ≥250mg/dL for one hour
More than 40% of young adults with type 1 diabetes (T1D) also have overweight or obesity. Each of these diagnoses increase the risk of adverse cardiovascular events. Investigators aim to obtain reference data for individuals with T1D who do not have overweight obesity, to understand how close GLP-1 analogue obesity treatment in those with overweight/obesity brings physiologic markers of cardiometabolic risk to those with BMI in the normal range. Specifically, investigators will describe how drivers of gluconeogenesis and lipemia (specifically measured as visceral fat ratio, insulin resistance, and postprandial lipemia,) that contribute to cardiometabolic risk in T1D change over time.
Type 1 diabetes (T1D) affects approximately 2 million Americans, and only 2 in 8 young adults ages 18-31 years achieve glycemic targets (glycated hemoglobin A1C \<7.0%). Achieving glycemic targets is associated with reduced risk of micro-and macrovascular complications. Sleep deprivation leads to impaired glucose tolerance and insulin sensitivity in adults without chronic conditions and with T1D. Promoting sleep in laboratory and natural environments contributes to improvements in insulin sensitivity, glucose levels, and distress symptoms in young adults without chronic conditions and more time in range in adolescents with T1D. Multiple dimensions of sleep health (alertness, timing, efficiency, and sleep duration) are associated with better achievement of glycemic targets in adults with T1D. Therefore, sleep health dimensions are appropriate therapeutic targets to improve glucoregulation and other diabetes self-management outcomes in this population. Our primary objective is to evaluate the immediate and short-term effects of a 12-week CB-sleep intervention compared to enhanced usual care (time balanced attention control) on actigraphy- and self-report derived sleep health dimensions and diabetes self-management outcomes (glycemia and distress symptoms) over 9-months (Stage II of the NIH Model for Behavior Change, ORBIT phase III). CB-sleep is guided by principles and practices from motivational interviewing and the Transtheoretical Model of Behavior Change with interactive stage-matched sessions.
Diabetes distress has been identified as one of the largest contributors to the racial disparity in glycemic control that disproportionately burdens Black patients ages 18-30 years with type 1 diabetes (T1D). In order to combat this issue, this study assesses the feasibility of the culturally tailored intervention T1DES and evaluates the effect of the T1DES intervention on diabetes outcomes in a pilot randomized clinical trial among Black young adults with T1D.
This is a single center, single arm non-randomized study of 48-hour CGMIS wear duration incorporating two meal-challenge tests to explore the performance of a single insertion combined glucose-sensing insulin delivery cannula.
The overall goal of this study is to develop and test a novel method involving ultrasound imaging, in order to detect the development of type 1 diabetes. In this study the investigators will first establish a standard operating procedure for measuring pancreas blood flow speed and volume in the pancreas of human subjects. The investigators will then determine 1) whether these pancreas blood flow factors differ between healthy subjects and those who have recently developed type1 diabetes; and 2) how variable measurements are in healthy subjects and subjects that recently developed type1 diabetes, both between subjects and over time. To address these aims the investigators will perform pancreas ultrasound measurements in each subject using an approved injectable 'bubble' contrast agent that allows measurement of pancreas blood flow. The investigators will compare ultrasound measurement with characteristics of the subject's type 1 diabetes, including genetic factors, glucose levels and other circulating factors, as well as other factors that may influence blood flow in the pancreas independent of type1 diabetes. The successful conclusion of this study will indicate whether measuring pancreas blood flow speed/volume will be helpful in monitoring whether type1 diabetes will emerge and thus will allow a large scale study to answer this question.
This RCT aims to improve T1D care in East African children and young adults by testing the hypothesis that enabling patients to continuously monitor glucose levels with flash CGM technology will improve glucose time-in-range (glucose level 70-180 mg/dl). A second primary endpoint is to perform a cost analysis on flash glucose monitoring compared to 3x/day SMBG, to determine whether this technology is cost-effective in the setting of a less-resourced nation. After a 2 week assessment with blinded CGM when a potential subject's ability to wear CGM is confirmed, subjects will be enrolled for 12 months in randomized, open label study, with a primary endpoint measurement at 6 months. All subjects will receive monthly diabetes self-management education. For the first six months, months 1-6: * Half of patients (n=90) will be randomized to an unblinded FreeStyle Libre 2 CGM.They and their care providers will be able to continuously see their CGM glucose levels to assist in insulin adjustment. * Half of patients (n=90) will be given sufficient test strips for 3x daily SMBG while wearing blinded CGM (control group). Neither they nor their care providers will be able to see their CGM glucose levels (the blinded CGM is simply for outcome measurement, not an intervention). As per usual clinical practice, only the SMBG glucose levels will be available to assist in insulin adjustment. * The change between baseline to 6 months in CGM-derived glucose percent time-in- range will be compared between groups (first primary study endpoint). For the second six months, months 7-12: * The control group will switch to unblinded CGM months 7-12 (their data months 7-12 months will be compared to their data months 1-6 as part of the primary endpoint assessment). * The patients who wore the unblinded CGM months 1-6 will continue for another 6 months to assess the impact of wearing the CGM for 12 continuous months (a secondary endpoint). Once the clinical portion of the study is complete, study investigators who are health economists from the Uganda Ministry of Health will perform a costs analysis (second primary endpoint).
Type 1 diabetes (T1D) is one of the most common chronic illnesses of childhood. The involved treatment regimen, including daily insulin administration/pump management, frequent blood glucose checks, and careful track-ing of food intake, places a high-stress burden on patients and their families. Adolescence is a particularly risky time for T1D management given a marked decline in treatment adherence and glycemic control. Over 80% of adolescents with T1D have poor glycemic control (A1c \>7.5%), and one significant risk factor is the increase in negative affectivity, including depression and anxiety symptoms, that distinguish adolescents with T1D. Elevated depression and anxiety symptoms affect 40% of teens with T1D. Preliminary data support the notion that negative affectivity contributes to diminished treatment adherence and worsening of glycemic control, partially through the effects of negative affectivity on stress-related behavior such as maladaptive eating behavior (e.g., dietary restriction, uncontrolled eating patterns, and insulin omission for weight control). There is no gold-standard approach to address the poor glycemic control seen in adolescents with T1D. The creation of novel, targeted interventions, tailored for the developmental needs of adolescents with T1D and the particular burdens of coping with their chronic illness, are needed. Mindfulness-based interventions delivered to adolescents without T1D, including the team's preliminary work in teens with depression and weight-related disorders, have shown promise in treating negative affectivity, maladaptive eating behavior, and health outcomes. A mindfulness-based approach may be well-suited for adolescents with T1D, but given that the mechanisms of association among negative affectivity, stress-related behavior, and self-care are unique to individuals with T1D, interventions must be specifically tailored for this population. The goal of this study is to, therefore, adapt an existing 6-session mindfulness-based intervention, Learning to BREATHE, for use with adolescents with T1D (BREATHE-T1D). The first specific aim of the study is to adapt BREATHE for adolescents with T1D and to adapt a relevant and credible health education comparison curriculum (HealthEd-T1D). The second aim is to carry out a 2-way pilot randomized controlled trial to evaluate the feasibility and acceptability of BREATHE-T1D and HealthEd-T1D. The result of the current study will be a feasible and acceptable mindfulness intervention and comparison curriculum that can be evaluated in an efficacy trial. The multidisciplinary study team contributes complementary areas of expertise in adolescents with T1D, behavioral intervention development, negative affectivity and maladaptive eating behavior, adolescent mindfulness-based intervention, qualitative data analysis, and delivery of behavioral health interventions via telehealth. The study's innovative approach will enable the investigators to establish a feasible/acceptable intervention tailored for adolescents with T1D, leading to a future proposal for a full-scale efficacy trial.
Empagliflozin, an inhibitor of the sodium glucose co-transporter 2 (SGLT2), reduces post-prandial glucose levels in adults with both type 2 and type 1 diabetes and importantly reduces both cardiovascular and renal complications in type 2 diabetes. In adults with type 1 diabetes empagliflozin improves endothelial function and vascular stiffness when used in conjunction with insulin. There is clear evidence that complications in type 1 diabetes have their origins during adolescents thus to reduce diabetic complications with adjunctive therapy, this age group must be studied. These studies will need to focus on the effects of these adjunctive agents on functional biomarkers for development of complications. This study is designed to develop pilot and feasibility data for a large scale trial of low dose empagliflozin, 2.5 mg daily, on biomarkers for the development of cardiovascular and renal complications in adolescents between 12 and 18 years of age. The investigators will specifically study the effects of 8 weeks of empagliflozin on: 1. Pre-and post-prandial inflammatory markers using high carbohydrate and high fat meals. Inflammatory markers to be measured include interleukin-6 (IL-6), tissue necrosing factor α (TNF-α), complement component C3 concentrations and skin advanced glycosylation endproducts (AGE). 2. Pre-and post-prandial vascular function including forearm vascular resistance, endothelial function and pulse wave velocity. 3. Microalbuminuria and pre- and post-prandial glomerular hyperfiltration, tubular injury and renal inflammation. The investigators will, also, measure more traditional risk markers including blood pressure, hemoglobin A1c, and lipids. Eligible participants will have had diabetes for at least 1 year and not have other chronic medical illnesses or diabetes complications. Because of the risk of diabetic ketoacidosis (DKA) subjects must have a hemoglobin A1c level less than 9% and have no history of recurrent DKA or known insulin omission. This will be the first pilot study designed to explore primary endpoints regarding cardiovascular and renal disease rather than glucose control with empagliflozin therapy in adolescents with type 1 diabetes.
It is well-established that persons with type 1 diabetes (T1D) are at an increased risk for morbidity and mortality related to bone fracture due to poor bone health, however we do not fully understand the mechanism behind the increased fracture risk. We are examining bone health and the microbiome in adolescents and young adults with type 1 diabetes to better understand the reasons behind this increased risk.
Type 1 diabetes (T1D), is associated with considerable risk of morbidity and mortality due to chronic hyperglycemia. Despite innovations in management, pediatric patients of African ancestry (AA) have been found to have persistently higher mean blood glucose (MBG) than European ancestry (EA) patients. The investigators hypothesize that an intervention using advanced insulin delivery technology together with home management will sustainably improve MBG to levels comparable to EA patients without increasing hypoglycemia. The investigators will first perform a small "field trial" of the intervention in African American patients having T1D, with 8.5\<HbA1c\<12% aged 10-17 years. The primary intervention approach will use a combination of an advanced hybrid closed loop (AHCL) pump + enhanced home video management conferencing with study CDE nurse coordinator. Information gained in the "field trial" will be used to more specifically tailor the intervention in a randomized trial. In the second part , the investigators will conduct a randomized trial of the study intervention in participants with the same clinical features as the field trial for a six month pilot period. Participants will be randomized into one of four groups. The special intervention group (AHCL+conferencing) group will be compared with a group using patient's current insulin management+followup, vs AHCL+without conferencing, vs patient's standard insulin management+conferencing. The investigators will compare HbA1c, MBG, time in glycemic range, ability to adhere with home management, satisfaction with management procedures between the groups.
Lower socioeconomic status (SES) individuals with type 1 diabetes have poorer outcomes than wealthier patients and part of this disparity comes from a lack of tools and knowledge about how to teach these patients on the technologies other patients take for granted. Therefore, this is a study designed to develop and test low literacy English/Spanish language teaching tools for patients with type 1 diabetes treated with varying types of technology in the Los Angeles County healthcare system. The aims are to:To reduce health disparities for underserved adults with diabetes on multiple daily injection (MDI) therapy using vials and syringes through the use of a simplified lower literacy, culturally and language appropriate approach to teach, implement and follow these individuals started on insulin pens and pumps/continuous subcutaneous insulin infusion (CSII); To show no increase in rates of diabetic ketoacidosis (DKA) or severe hypoglycemia when using CSII or pen therapy compared to baseline rates; To reduce time spent in hyper and hypoglycemic ranges, as well as glycemic variability, as measured by blinded continuous glucose monitoring (CGM); Reduce psychological distress due to diabetes and improve health-related quality of life, as measured by validated distress and quality of life scales. Secondary Aims include: Reduction in A1C levels with CSII/pen therapy compared to standard MDI treatment; and to perform a cost-analysis of the process of implementation to improve the generalizability of the model.
The 4T program encompasses: Teamwork, Targets, Technology, and Tight Range. These methods will help patients better manage their condition of Type 1 Diabetes with improved patient-reported outcomes.
The purpose of this research study is to find out how bones are affected in children and adolescents with type 1 diabetes (T1D) as compared to children and adolescents without type 1 diabetes.
Eighteen preschool aged children and their families will attend structured, multidisciplinary, family-centered intensive education sessions over a 3-day weekend in a residential camp setting to address the unique challenges of managing type 1 diabetes mellitus in young children.
The scientific goal of this study is to examine the effects of a ketogenic diet on hypoglycemia tolerance and brain function in people with type 1 diabetes mellitus (T1D) and to clarify the mechanistic role of ketones in this process. Glycemic management of T1D is typified by alternating periods of hyper- and hypo-glycemia. Because brain metabolism under usual conditions depends on glucose, acute hypoglycemia leads to immediate complications including impaired cognitive function and a counter-regulatory hormone response. Recurrent hypoglycemia is associated with functional and structural changes in the brain and contributes to the cognitive decline observed in individuals with diabetes. The state of nutritional ketosis (as it occurs during fasting or when following a ketogenic \[very low carbohydrate\] diet) may protect against these acute and chronic complications. As the body relies on fat metabolism, ketone bodies build up and provide an alternative fuel for the brain. Studies during hypoglycemia have shown better cognitive function and less hypoglycemia symptoms in the setting of nutritional ketosis or with ketone administration. This physiological benefit may have special relevance for people with T1D who experience hypoglycemia frequently. To date, no mechanistic studies have examined brain effects of nutritional ketosis in T1D; nor have any trials explored the potential relevance of this for diabetes care.
The study is the formative observation stage of behavioral intervention development. Sedentary adults with type 1 diabetes will be given access to a mobile application that incorporates biosensor feedback, teleconsultation, and online group exercise classes. The first aim is to quantify the feasibility, acceptability, and preliminary efficacy of the application. The second aim is to evaluate predictors and mechanisms of physical activity behavior change among these adults. The possible predictors the investigators are monitoring include usage of specific application features, momentary internal factors (e.g., pre-activity fear of hypoglycemia), momentary external factors (e.g., location), and latent external factors (e.g., mental health traits). These results will be used to develop a refined mobile application utilizing the most popular application features, as well as an algorithm that uses the identified predictors of physical activity to advise adults with type 1 diabetes when to engage in physical activity (i.e., context-aware physical activity coaching) and when to make related diet and insulin adjustments.
Despite major technological advances, management of type one diabetes mellitus (T1D) remains suboptimal, putting millions of people at risk for immediate and long-term complications. After meals, a mismatch between carbohydrate absorption rate and insulin action typically leads to alternating periods of hyper- and hypoglycemia. A conceptually promising approach to control both problems is dietary carbohydrate restriction to reduce postprandial blood glucose changes and insulin needs. In a prior survey study, the investigators documented exceptional glycemic control (HbA1c 5.67%) and low acute complication rates among 316 children and adults with T1D consuming a very-low-carbohydrate (VLC) diet. Despite these promising preliminary results, the use of VLC diets for T1D remain controversial, because of their restrictive nature and theoretical concerns regarding growth, ketoacidosis and hypoglycemia risks and efficiency of glucagon treatment for hypoglycemia. Glucagon is used as a rescue medication during severe hypoglycemia and increases blood glucose levels by mobilizing liver glycogen stores. If these stores are depleted during carbohydrate restriction, glucagon response may be inadequate and put individuals at risk for refractory hypoglycemia. A physiologic study has shown a blunted but still adequate response to glucagon in n=10 participants after following a VLCD for 1 week. Longer-term studies have not been done. To test the hypotheses that glucagon response remains adequate while following a VLC diet in the longer term, the investigators will conduct a glucagon challenge in participants who are assigned to the VLC arm of a randomized-controlled feeding study in 32 young adults with T1D who will receive a VLC vs a standard diet for 12 weeks. After an overnight fast, twelve participants in the VLC arm will receive IV insulin to lower blood glucose levels to 60 mg/dL, followed by a glucagon injection and monitoring of blood glucose levels and other metabolic fuels.
Type 1 Diabetes (T1DM) is a common chronic illness in children which presents difficult and often stressful management concerns for parents. As children approach adolescence, this burden increases with the desire for independence and self-management. No tool exists that addresses in a user friendly, easy to access and socio-culturally appropriate way, the psychosocial needs of parents as they move through this transition. This program targets the parents to help them at the very point where this transition is occurring.
The purpose of this study is to determine how Humulin-R regular insulin affects the body's ability to feel low blood sugar (hypoglycemia) when delivered intranasally compared to placebo in subjects with Type 1 Diabetes (T1D) with hypoglycemia awareness. The study will use continuous glucose monitoring (CGM) to collect this information. The study drug or placebo will be administered using an intranasal device.
The investigators are interested to evaluate the effect of BKR-017 (colon-targeted 500 mg butyrate tablets) as adjuvant therapy on metabolic control in type 1 diabetes (TID) subjects.
Successful transition to an adult diabetes clinic is an essential part of both clinical and psychosocial care for emerging adults with type 1 diabetes (T1D). Pediatric patients are generally very well supported by their parents, significant others, and multidisciplinary clinical care teams, however, these support networks tend to change once patients reach adulthood and are required to transition to a more independent clinical care model with their adult care providers. This change can often be an overwhelming adjustment with a potential impact on patient's clinical and psychosocial outcomes. As part of the proposed mixed methods study, in Phase 1, the investigators will develop online questionnaires for primary stakeholders in the transition process to improve understanding of their needs, expectations, and experiences around transition. Based on findings from Phase 1, up to 30 individuals from each of the six groups will be interviewed to discuss their responses and better understand their needs around the transition process (Phase 2). Subsequently, findings from the qualitative analyses of the semi-structured interviews will inform the preparation of recommendations that may help facilitate a successful transition for the various stakeholder groups (Phase 3).
Over 1.25 million Americans have Type 1 Diabetes (T1D), increasing risk for early death from cardiovascular disease (CVD). Despite advances in glycemic and blood pressure control, a child diagnosed with T1D is expected to live up to 17 years less than non-diabetic peers. The strongest risk factor for CVD and mortality in T1D is diabetic kidney disease (DKD). Current treatments, such as control of hyperglycemia and hypertension, are beneficial, but only partially protect against DKD. This limited progress may relate to a narrow focus on clinical manifestations of disease, rather than on the initial metabolic derangements underlying the initiation of DKD. Renal hypoxia, stemming from a potential metabolic mismatch between increased renal energy expenditure and impaired substrate utilization, is increasingly proposed as a unifying early pathway in the development of DKD. T1D is impacted by several mechanisms which increase renal adenosine triphosphate (ATP) consumption and decrease ATP generation. Caffeine, a methylxanthine, is known to alter kidney function by several mechanisms including natriuresis, hemodynamics and renin-angiotensin-aldosterone system. In contrast, to other natriuretic agents, caffeine is thought to fully inhibit the local tubuloglomerular feedback (TGF) response to increased distal sodium delivery. This observation has broad-ranging implications as caffeine can reduce renal oxygen (O2) consumption without impairing effective renal plasma flow (ERPF) and glomerular filtration rate (GFR). There are also data suggesting that chemicals in coffee besides caffeine may provide important cardio-renal protection. Yet, there are no data examining the impact of coffee-induced natriuresis on intrarenal hemodynamic function and renal energetics in youth-onset T1D. Our overarching hypothesis in the proposed pilot and feasibility trial is that coffee drinking improves renal oxygenation by reducing renal O2 consumption without impairing GFR and ERPF. To address these hypotheses, we will measure GFR, ERPF, renal perfusion and oxygenation in response to 7 days of cold brew coffee (one Starbucks® Cold brew 325ml bottle daily \[205mg caffeine\]) in an open-label pilot and feasibility trial in 10 adolescents with T1D already enrolled in the CASPER Study (PI: Bjornstad).
Despite advancements in care, most adolescents with T1D have higher BMI and significantly higher HbA1c than recommended and are markedly IR, placing them at increased risk for CVD1,2. Thus, alternative approaches to improve and maintain glycemic control, IR, and BMI for adolescents with T1D are urgently needed. This proposal moves beyond the current insulin and carbohydrate counting-focused lifestyle change paradigm to focus on sleep and circadian misalignment, which will allow for identification of new mechanisms that can be directly translated into future intervention and prevention trials. The goal of the current study is to utilize multiple objective measures of sleep duration, timing (actigraphy), and circadian rhythm (melatonin) in adolescents with type 1 diabetes (T1D; N = 40) and examine relationships with glycemic control, IR, vascular health, and BMI. Further, qualitative methodology will be used to identify barriers and facilitators to healthy sleep in adolescents with T1D.
Despite major technological advances, management of type one diabetes mellitus (T1D) remains suboptimal, putting millions of people at risk for immediate and long-term complications. After meals, a mismatch between carbohydrate absorption rate and insulin action typically leads to alternating periods of hyper- and hypoglycemia. A conceptually promising approach to control both problems is dietary carbohydrate restriction to reduce postprandial blood glucose changes and insulin needs. In a prior survey study, the investigators documented exceptional glycemic control (HbA1c 5.67%) and low acute complication rates among 316 children and adults with T1D consuming a very-low-carbohydrate diet. To test the feasibility of this approach, the investigators will conduct a randomized-controlled feeding study involving 32 adults and adolescents with T1D. Participants will be randomized to receive a very low carbohydrate vs. standard carbohydrate diet. Participants will be in the study for 12 weeks and receive all their meals by meal delivery.They will share continuous glucose monitoring data with the study team and be in close communication to adjust insulin doses as needed. All participants will have a screening visit, an individual or group education session, and 3 study visits to evaluate diabetes control and metabolic health. Some of these visits will have a fasting blood draw. Two of the visits will also comprise additional metabolic studies to assess glucagon response and brain function during hypoglycemia by magnetic resonance imaging (MRI). Participants will have IV catheters placed and receive IV insulin to drop blood glucose levels to 50 mg/dl for up to 30 minutes. The primary outcome will be HbA1c change from baseline. Secondary outcomes include detailed measures of glycemic variability, metabolic health, and quality of life.
The aim of this study is to compare the pharmacokinetic (PK) profile of diluted insulin aspart (U25) with undiluted insulin aspart (U100) in school-aged children and adolescents with type 1 diabetes (T1D) utilizing the euglycemic clamp technique and a standardized meal in a controlled research environment. The investigators hypothesize that dilution of insulin aspart (U25) will alter the PK properties as compared to undiluted aspart.
The purpose of this study is to gain more information about the step-by-step process that causes someone to develop type 1 diabetes. Scientists think that a person's own immune system, directed by genetic and environmental factors play a major role in its development. Participation involves a blood draw, a brief medical history questionnaire and measurements of height and weight. Some participants will be asked to return for annual follow-up visits for 10 years.
Rapid Action Insulin (RAI) absorption and action measured by time to reach maximum insulin concentration and glucose infusion rate.