View clinical trials related to Healthy Volunteers.
Filter by:Background: - The autonomic nervous system helps control things that happen automatically in the body, like blood pressure, heart rate, and digestion. When it doesn t work properly, it s called dysautonomia. Researchers want to learn more about dysautonomias and train doctors to learn how to better diagnose them. Objectives: - To allow people with autonomic disorders to be evaluated. - To help fellows in the NIH Autonomic Disorders fellowship program see a variety of diseases in their training. Eligibility: - People age 18 and older with dysautonomia; children over age 2 if they might benefit - Healthy adult volunteers Design: - Participants will have different procedures depending on their symptoms. They will have one or more visits. They will have some but not all of the tests below. - Participants will have a medical history and physical exam. They may be tested for problems thinking. They may complete a symptom questionnaire. They may have their temperature and blood pressure taken. - Participants may have an intravenous line placed. A needle will guide a thin plastic tube into an arm vein. - Participants may have blood drawn several times. They may give a urine sample. - Participants may have an electrocardiogram. - How much blood a participant s heart is pumping and/or how much blood is flowing through their arm may be measured. The total amount of blood in their bloodstream may be measured. - Participants may have their ability to sweat and/or sense of smell tested. - Breathing, bowel sounds, and/or body functions may be monitored. - Pupil size, response to environmental temperature changes, and/or breathing may be measured. - Participants may have a bladder ultrasound. - Small pieces of skin may be taken for study.
The purpose of this study is to analyze the effect of xenon-inhalation on erythropoetin-level in blood of healthy volunteers and to determine the efficient time of inhalation. Hypothesis: Xenon-inhalation enhances erythropoetin-levels in blood
Objective Ionotropic glutamate receptors are ligand-gated ion channels responsible for most of the excitatory neurotransmission in the mammalian central nervous system (CNS). Based on pharmacology, they have been grouped into three subtypes-NMDA, AMPA and kainate. In recent years it has become apparent that the receptors do not function alone, but in the company of auxiliary proteins that regulate their activity [1]. Some of these have been shown to modulate AMPA receptor trafficking, gating and pharmacology and are classified as transmembrane AMPA receptor regulatory proteins, or TARPs ( >=-2, >=-3, >=-4, >=-5, >=-7, and >=-8). Genetic data indicate a possible role of TARPs in schizophrenia, depression, epilepsy, neuropathic pain, and bipolar disorder [1]. In a preclinical collaboration with Eli Lilly, we developed a promising radioligand, 18F-TARP252 to image TARP >=-8 using positron emission tomography (PET). This protocol covers three phases: - Phase 1: kinetic brain imaging to quantify TARP >=-8 in brain relative to concurrent measurement of the parent radioligand in arterial plasma; - Phase 2: if 18F-TARP252 is successful in Phase 1, we will estimate the radiation-absorbed doses by performing whole body imaging; - Phase 3: test-retest analysis of brain binding relative to concurrent measurement of the parent radioligand in arterial plasma. Study Population Healthy adult female and male volunteers (n=22, ages 18 - 55) will undergo brain imaging. An additional eight healthy volunteers will undergo whole body dosimetry analysis. Design For quantification of TARP >=-8, 22 healthy controls will have brain PET imaging using 18F-TARP252 and an arterial line. Some of them will have a test-retest scan. Eight additional subjects will have a whole body PET scan for dosimetry. For dosimetry, no arterial line will be used. Outcome Measures To assess quantitation of TARP >=-8 with 18F-TARP252, we will primarily use two outcome measures: the identifiability and time stability of distribution volume calculated with compartmental modeling. In test-retest study, we will calculate the retest variability. We will assess whole-body biodistribution and dosimetry of 18F-TARP252 by calculating doses to organs and effective dose to the body.
Background: - Focal hand dystonia (FHD) causes muscles to contract, leading to abnormal movements or postures. Musicians, writers, and athletes often get it. Researchers want to study how patients with this condition learn, a process of the brain that depends on a property called plasticity. Objective: - To study brain plasticity in people with FHD. Eligibility: - Right-handed adults 18 years and older with FHD. - Healthy, right-handed adult volunteers. Design: - Participants will be screened with medical history, physical exam, pregnancy test, and questionnaire about their right-handedness. - Participants will have 2 study visits on 2 different days. - Participants will sit in a chair and have up to 30 Transcranial Magnetic Stimulation (TMS) pulses on the left side of the head. A brief electrical current passes through a wire coil on the scalp. They will hear a click and may feel a pulling on the skin or muscle twitches. They may have to keep their eyes open and remain alert, tense certain muscles, or perform simple finger movements. - Forty more pulses, with 10 seconds between, will be given on the left side of the head. Some will be small, some big. - Researchers will measure muscle response through small electrodes taped to the right hand. - A cloth cap will be put on the participant s head. Researchers will write on tape on the cap. - Participants will have the r-PAS. An electrical stimulator will be placed on the nerve at the right wrist. Repeated magnetic pulses will be delivered in trains or short bursts together with electrical stimulation of nerve. Participants will receive up to 840 pulses. - Participants will be contacted after a few days for a follow-up check.
This is a randomized, double-blind, single dose, dose-escalation study to evaluate the safety, tolerability, and pharmacokinetics of NCTX (PEGylated Liposomal Iodixanol Injection) administered intravenously to healthy volunteers. In addition, computed tomography (CT) scans will be acquired to measure radiographic density in regions of interest (ROI) at times from 3-5 hours and up to 72 hours following NCTX administration.
In this first in human study the aim is to assess the safety, pharmacokinetics and pharmacodynamics of 2B3-201 in a randomized, first in human, double-blind, placebo- and active comparator- controlled 3-way crossover study in 18 healthy male subjects (part 1). Furthermore, the findings obtained from part 1 will be extended and confirmed in a subsequent parallel open label study in 18 healthy male and 12 MS patients and an open label study with methylprednisolone as comparator in 12 female volunteers (part 2).
The purpose of this study is to determine the effect of intrathecal oxytocin on areas and intensity of hyperalgesia and allodynia induced by topical capsaicin.
This type of study is called a radiolabeled study. For this study, LY3023703 (study drug) has been specially prepared to contain radiolabeled carbon [14C]. [14C] is a naturally occurring radioactive form of the element carbon. This study will help understand how the drug appears in the blood, urine, and stool after it is administered to healthy men. Information about any side effects that may occur will also be collected. This study will last up to 15 days for each participant, not including screening. Screening is required within 28 days prior to the start of the study.
This is a randomized, double-blind, placebo-controlled, multiple-dose study, designed to assess the safety, tolerability, and pharmacokinetics (PK) of ACHN-975. This study will take place in the US at one clinical site.
Background: - Melanocortin receptors are proteins in the body that help send messages between body systems. One such receptor, the melanocortin 3 receptor (MC3R), is important for regulating body weight. Differences in MC3R can affect fat metabolism - or how the body handles fat. Some people who have changes in the MC3R genetic code are heavier than those who do not have these changes. These changes are found more often in African Americans. Researchers want to study the MC3R in African American adults to see how these changes may affect fat metabolism. They will look at overweight adults with either the most common genetic code for the MC3R or a rare variant. Objectives: - To study the role of the MC3R in body weight and fat metabolism. Eligibility: - Healthy African American volunteers between 18 and 55 years of age. - Volunteers must be overweight (body mass index at least 30 kg/m2) but weigh less than 450 lbs. Design: - The study consists of an outpatient screening visit and a 7-day inpatient visit with dietary studies. - Participants will be screened with a physical exam and medical history. Blood samples will be collected. (Participants will need to fast for 10 hours before giving blood samples.) A body scan will be given to determine fat, bone, and muscle content. Participants will complete a 3-day dietary assessment to record their food and drink consumption. They will also have an exercise test to look at heart and lung function. - Participants will have a 7-day inpatient stay. They will have a regular diet for the first 3 days of the study. For the final 4 days, they will have a diet with a higher fat content. - During the inpatient visit, participants will have the following study procedures: - Body measurements - Daily exercise routine - Imaging studies of the body - Measurement of a whole day s energy expenditure (spending one day in metabolic chamber-day 5) - Frequent blood samples - Urine collection for 24 hours (days 3 and 7) - Fat biopsy (collection of a small sample of fat tissue from under the skin on the abdomen) - Insulin and metabolism tests while eating the two different diets (day 4 and day 7). - After the final insulin and metabolism test, participants will be discharged from the study.