View clinical trials related to Healthy.
Filter by:This study is designed to look at the potential for an investigational drug (PF-04995274, under development by Pfizer, Inc. as a potential treatment for Alzheimer's disease) to reverse changes in memory and learning/problem solving skills caused by co-administration of a marketed drug called scopolamine. Scopolamine is known to cause temporary changes in memory and learning/problem solving skills that are similar to those seen in people with alzheimer's disease(AD).
The purpose of this study is to test the safety and efficacy of an investigational neuromuscular blocking agent called CW002 and to document its effects on healthy adult volunteers. A neuromuscular blocking agent is a drug that temporarily prevents muscles from moving. CW002 has not yet been approved by the Food and Drug Administration (FDA). Usually, neuromuscular blocking agents are used together with other drugs that put people completely "asleep". These drugs allow doctors to place a breathing tube in the airway, stop muscles from moving during surgical operations, and allow ventilation (movement of air). This research is being done because CW002 is expected to act quickly and to provide a muscle block of intermediate (not too long, not too short) duration. The researchers would like to test increasing doses of CW002 that can be given without causing severe side effects. If shown to be both safe and effective, such a compound would be useful in surgical procedures and could improve future anesthetic care.
Age-related macular degeneration (AMD) and glaucoma are among the leading causes of blindness in the western world. Elevated intraocular pressure (IOP) is a well known major risk factor for glaucoma. In addition, there is growing evidence that vascular factors, including arterial hypertension and hypotension, may play a role in the pathogenesis of AMD and glaucoma. To gain more insight into these mechanisms in humans is the primary goal of the present study. Optical coherence tomography (OCT) delivers three dimensional, volumetric reflectivity information through transparent media in vivo. Moreover, the images show a high choroidal penetration and a resolution comparable to an histologic examination when infrared light sources are used. Because of its non-invasive character, OCT provides an ideal method for diagnosis and monitoring of retinal and choroidal abnormalities. The present study aims to investigate whether choroidal thickness is temporarily altered by changes in IOP or systemic hemodynamic parameters. IOP will be increased by the use of a suction cup technique, mean arterial blood pressure will be altered by intravenously administered Phenylephrine or Sodium-Nitroprusside.
The purpose of this study is to investigate memory problems in patients with cancer.
This is a single-arm, single-center study in healthy volunteers. This study is designed to evaluate the safety of IM injections using single-use autoinjectors with a 25G × 1" needle. The purpose of this study is not to evaluate study treatment; therefore, all injections will be performed with Avonex placebo only; no active IFNβ-1a will be administered.
The purpose of this study in heathy people is to investigate the safety, toleration and time course of PF-03654764 in the blood, following multiple doses given by mouth together with fexofenadine.
Background: - New weight-loss intervention programs are being studied to determine their effectiveness in helping overweight and obese individuals reach a healthy weight. However, these programs often have not been tested against each other, and researchers are interested in determining which interventions are most effective both immediately and over the long term in promoting and maintaining weight loss. - Mindful Tai Chi is a combined form of the meditative martial art tai chi and the practice of mindfulness meditation. Tai chi and mindfulness meditation both have common philosophical underpinnings that address health promotion and well-being by applying the skill of non-judgmental awareness on a moment-to-moment daily basis. More research is needed on whether Mindful Tai Chi and mindfulness meditation can help improve various health factors in overweight and obese individuals. Objectives: - To compare the effects of Mindful Tai Chi, mindfulness meditation, walking, or a discussion group on the weight and well being of overweight and obese participants. Eligibility: - Healthy individuals at least 18 years of age who are either overweight or obese (body mass index between 25 and 40), have a sedentary lifestyle (have not engaged in more than 1 hour of aerobic exercise per week within the last month), and are willing to commit to a specific weight-loss intervention program. Design: - This study involves four visits for collecting information and 12 weeks of research study activities. - During the first visit, participants will hear information about the study and may ask any questions. They will be screened with a medical history and physical examination, and those eligible will be assigned to one of the four study groups: Mindful Tai Chi (MTC), Mindfulness Meditation (MM), Mall Walking (MW), or Weekly Discussion (WD) group. - For the second visit, participants will give blood and urine samples, receive an abdominal ultrasound, ride a stationary bicycle for 5 minutes, and fill out health-related questionnaires. - For 12 weeks, participants will be involved in the following activities depending on their group: - MTC: Class for 2 hours per week, emphasizing the meditation aspects of tai chi. Each session will include at least 20 minutes of meditation. Participants will receive written instructions and an accompanying DVD in comparable formats specifying a minimum of 30 minutes of daily home assignment. In weeks 2 and 8, participants will have a workshop for mindfulness skill application in daily activity. - MM: Class for 2 hours per week of mindfulness meditation. Participants will receive written instructions and an accompanying DVD in comparable formats specifying a minimum of 30 minutes of daily home assignment. In weeks 2 and 8, participants will have a workshop for mindfulness skill application in daily activity. - MW: Participants will meet at a designated mall location once a week for 2-hour walk. - WD: Participants will meet at the National Institutes of Health for weekly weight-loss discussion. - For the third and fourth visits, participants will receive the same procedures as those used in the second visit. These visits will occur at the end of the 12-week activity period and at a 3-month follow up visit.
To evaluate whether PF-02545920 reduces the effects of ketamine on brain activation during causal learning as measured by fMRI compared to placebo in healthy human subjects, and to evaluate whether behavioral measures of abnormal causal learning under ketamine are reduced by treatment with PF 02545920.
Objectively evaluate the ocular surface (pre-corneal tear film) of individuals prior to and after an intervention (such as a dry eye treatment, environmental change, artificial tear use, or contact lens wear) in a controlled-environmental chamber, over time using non-contact instruments.
To evaluate the safety and tolerability of two supplements in healthy subjects taken daily for six months.