View clinical trials related to Healthy Volunteers.
Filter by:Background: Vaccines against SARS-CoV-2, the virus that causes COVID-19, have been highly effective against preventing severe disease. But the protective effects of these vaccines appear to wane over time. Researchers want to learn why. Objective: To learn more about how the immune system responds to vaccines against infections like SARS-CoV-2. Eligibility: Healthy adults ages 18 or older who are scheduled to receive either a new vaccine or a booster shot against SARS-COV-2 or another emerging infection. Design: Participants will be screened with a medical history and blood and urine tests. Participants will have up to 8 study visits in 1 year. Each visit should last less than 2 hours. At each visit, participants will give blood samples. Some blood samples will be used for genetic testing. They will also give updates on their health. After the first study visit, participants will receive either a first vaccination or a booster shot. They must get the vaccine in their community or workplace. They will not get the vaccine at NIH. This study currently focuses on SARS-CoV-2, but it will expand to other infectious diseases as they emerge and become the target of new vaccines. ...
This research is being done to assess the effect of radiofrequency (RF)-based treatment on skin and skin conditions.
The overall goal of this protocol is to evaluate [18F]APN-1607 as a PET radiotracer for measuring longitudinal change in tau pathology in participants with PSP.
The objective of this clinical study is to evaluate the safety and efficacy of mechanical coring for directional skin tightening. This study is a prospective, up to 3 center, multiple skin treatment area study of the safety and efficacy of mechanical coring with directional closure to achieve directional skin tightening.
A single-center, randomized, double-blind, placebo-controlled, dose escalation safety, tolerability, and pharmacokinetic phase I clinical study of Naoqingzhiming Tablets in Chinese healthy subjects.
Background: Diet is one of the most modifiable behaviors affecting health. But diet assessment measures that are based on self-report can be inaccurate. Researchers want better ways to address the role of diet in chronic disease. They want to see if stable isotopes can be used to better assess what people eat. Objective: To see if stable isotopes can help scientists identify things people eat. Eligibility: Healthy adults ages 18 to 65 Design: Participants will be screened with a medical history and physical exam. They will have blood and urine tests. These tests will be repeated during the study. Participants will stay in the inpatient unit of the NIH in Phoenix, Arizona, for 13 weeks. For 7 days, participants will eat a diet prepared by the NIH kitchen. They will get balanced meals that are 50% carbohydrates, 20% protein, and 30% fat. Then participants will be randomly placed on one of 3 diets containing different percentages of carbohydrates from soda. Participants height and weight will be measured. The amount of fat and muscle in their body will be measured by body scans that are similar to x-rays. Participants will have oral glucose tolerance tests. They will consume a sugar drink and then give blood samples over 3 hours. Participants will give hair and stool samples. Participants will complete a diet questionnaire. It assesses their food intake over 24 hours. Participants will complete behavioral questionnaires and computer performance tests. Participants will have fat biopsies taken from their stomach and thigh. Participants will have three 24-hour stays in a metabolic chamber. It is used to measure metabolism.
Background: Glucocorticoids (GC) were included in the list of banned substances in sports in 1986, because of evidences of positive effects on physical performance and the important health risks associated with its consumption. Due to the fact that GC are commercialized in a variety of pharmaceutical forms and are administered in different ways, it is necessary to establish discrimination criteria to guarantee the therapeutic use of these drugs and to prevent doping. Hypothesis: Discrimination criteria between allowed and prohibited administrations of GC must be specific for each of the compounds. Further studies are needed to provide discrimination criteria related to oral administration of GC. Objectives: To conduct excretion studies with dexamethasone, methylprednisolone and deflazacort in order to define notification levels and wash-out periods after the administration of a single dose (DEX, MP and DEF) or repeated doses (DEX and MP) of these drugs. Methods: Non-randomized, open-label, pharmacokinetics clinical trial where a single dose of DEF, MP and DEX and also a multi-dose of DEX and MP will be administered orally to healthy volunteers (total n=50).
The study determines the EPA DHA uptake from different omega-3 supplements against a control.
This is an early feasibility trial to determine whether transcutaneous neuromuscular electrical stimulation, with or without transcutaneous spinal cord stimulation, using an investigational neurostimulation device improves functional arm/hand movements in individuals with paralysis or paresis due to a spinal cord injury or stroke and improves functional arm/hand or leg/foot movements in individuals with paralysis or paresis due to other brain or nerve injuries. In this study, eligible individuals that agree to participate will be asked to attend up to 5 study sessions a week for 1 year (depending on participant availability), with each session lasting up to 4 hours. At the first study session, participants will have their demographic information collected, vital signs assessed, and have measurements performed of their limbs and torso, as appropriate. They will also undergo clinical evaluations and tests to assess their current functional movement and sensation capabilities. During subsequent study sessions, participants will undergo many tasks designed to improve functional movements in paralyzed limbs. Specifically, participants will receive neuromuscular electrical stimulation to the limb(s) and/or electrical stimulation to the spinal cord to evoke specified movements. The stimulation parameters and locations on the spinal column and/or limb(s) that evoke specific movements will be noted. The movements will be assessed with visual inspection, electromyography, and/or sensors. The clinical evaluations and tests to assess functional movement and sensation capabilities will be repeated throughout the study and at the last study session to assess for functional improvements compared to the first study session. Upon completion of these study sessions, the individual's participation in the study is considered complete.
Determination of both the degree and duration of the immunity provided after receiving the BNT162b2 vaccine against SARS-Cov-2.