View clinical trials related to Healthy Volunteers.
Filter by:Recently, researchers in the field of cognitive psychology have shown a great interest in Virtual Reality (VR). Indeed, this technology is the most advanced to create immersion and sense of presence in a virtual environment (VE) and gives the opportunity to study cognitive mechanisms in more ecological way. However, little is known about the impact of VR on the cognition and emotional states of the VR users. According to the scientific literature, the sense of presence (the fact that the user experiences the sense of being in the VE) is strongly related to the emotional experience, but it is not clear what mechanisms underline this relation. Thus, more research is necessary to its better understanding. Moreover, a few studies have shown age related differences in sense of presence, with children having greater inclination for sense of presence than adults. This might be explained by the fact that frontal cortex (which is responsible for a control of the sense of presence) is still developing in childhood (the maturation last for the beginning of adulthood). The goal of the present study is to examine which factors might be responsible of the interaction between the sense of presence, the immersion and the emotional experience in Virtual Reality, and the age-related difference. Thus, the investigator study 2 types of healthy participants (volunteers) in order to examine the age-related difference in this interaction: young adults between 18 and 25 years old and children between 8 to 14 years old. To study different factors potentially involved in the interaction four experiments will be conducted. In each experiment the investigator manipulate one type of factor to study its impact on emotions and the sense of presence in a VE: (1) the image quality, (2) the fact that participant had an avatar (body) in the VE, (3) the possibility to interact or not in VE and (4) the nature of elements with which it is possible to interact (objects or living being). In the end of this study the investigator hope to contribute to the knowledge of adapted use of VR for different type of users, such as children and young adults.
To evaluate the safety and tolerability of single and multiple ascending oral doses of DWP14012 in healthy Japanese, Caucasian and Korean subjects
Recently, new clinical testing of saccular and utricular function have been developed and validated, the so-called vestibular-evoked myogenic potentials - VEMP (Brantberg et al. 2009, Cornell et al. 2009, Curthoys 2010, Manzari et al. 2012). Among them, the cervical VEMP (cVEMP) are short-latency electromyographic (EMG) modulations of the contracted sternocleidomastoid muscles in responses to vibration applied on the forehead. The clinical literature suggests that cVEMP are almost entirely saccular in origin (Halmagyi et al 1995). The aim of our research is to evaluate changes in the otolith function in microgravity and hypergravity using this clinical test. Cervical vestibular-evoked myogenic potentials (cVEMP) will be recorded by surface EMG electrodes in response to bone conducted vibration to specifically assess saccular function (Halmagyi et al 1995). The primary measures will include muscle activity response amplitudes and the stimulus intensity threshold at which the cVEMP is detected. Given that there is an off-loading of the saccules in microgravity and an increased loading in hypergravity, we hypothesize that there will be a reduction in cVEMP amplitude in microgravity and an increase in cVEMP amplitude in hypregravity compared to normal gravity. These changes in amplitude will be accompanied by changes in the threshold of the stimulus level required to elicit a cVEMP.
During weightlessness, the cardiovascular system is subject to rapid changes which has been demonstrated in studies of short term (Space Shuttle) and long term missions to Skylab, MIR, and the International Space Station (Nicogossian et al., 1989; Blomquist, 1994; Platts et al., 2014). There is also evidence for changes in the blood vessel structure, the metabolism and the responses to vasodilator and constrictor substances that might have long-term health consequences resembling the effects of aging on the cardiovascular system (Hughson and Shoemaker, 2004). Cardiovascular adaptations cause an increased incidence of postflight orthostatic intolerance (fainting), decreased cardiac output and reduced exercise capacity. Besides these postflight effects, weightlessness could also have harmful consequences during the flight. For example, it has been shown that cardiac arrhythmia may occur during space missions, even in healthy individuals (Convertino, 2009). To understand the cardiovascular reactions of the human body to changing conditions of gravity is thus an important aim of space science. While non-invasive imaging of microcirculation is a very promising tool to evaluate cardiovascular condition, knowledge on the involvement of the microcirculation in cardiovascular alterations induced by weightlessness is very limited and further research in this field seems promising. Before using a non-invasive technique for imaging the microcirculation during space flights, it has to be evaluated on earth. Different proven simulation models exist for investigating the effects of weightlessness on the human body under terrestrial conditions: head down bed rest, dry and wet immersion, and parabolic flights. Among these models, only parabolic flight recreates a real state of weightlessness (see the participant document of information for a description of parabolic flights). Cardiovascular studies have often been performed during parabolic flights. Within the limitations inherent to the method (short duration of weightlessness - about 21 s - following and followed by hypergravity 20 s periods at 1.8g), some remarkable results have been published over the years. The aim of our research approach is to test feasibility of the in vivo evaluation of the microcirculation in parabolic flight in order to be able to better describe cardiovascular response mechanisms under these conditions. In this context, we expect alterations in the microcirculatory flow during the weightlessness period of parabolic flight. Our approach might help develop a diagnostic tool to more easily identify weightlessness-induced cardiovascular diseases and improve strategies for adapting astronauts to weightlessness prior to the space mission.
The CHRONOS project aims to provide a device to detect earlier the motor decline, by developing a precise quantitative device measuring "Motor Functional Age" (MFA) of young, middle-aged and old people, thus preventing future functional motor loss for healthy aging. The MFA might be different from the Chronological Age (CA), depending on lifestyle, physical activity, and medical condition. Thus, this device will permit monitoring, adaptation and new design of a variety of personalized therapies for healthy aging including physical exercise, medication and nutritional interventions to reduce the MFA toward or less than the CA. The device combines data processing software that estimates the MFA by assessing muscle aging using a non-invasive multichannel electromyographical technique coupled to accelerometry sensors for motion evaluation. These data will provide with a built-in clinical database of subjects from different age categories (25-75 years old).
The purpose of this study is to test how well people tolerate a new dietary ingredient called 2-HOBA and how it is metabolized in the body. 2-HOBA is a compound that occurs naturally in buckwheat seeds. This dietary ingredient has been used in animal studies, and single doses have been tolerated well when given to a small group of healthy people. In this study we will test how well people tolerate taking 2-HOBA over 2 weeks and how it is metabolized by the body.
This is a phase 1, randomized, single-center, 3-part, FIH study to assess the safety, tolerability, pharmacokinetics (PK, or how the drug behaves in the body), and pharmacodynamics (PD, or what the drug does to the body) of single and multiple doses of CC-99677 and to characterize the effect of food on the single-dose PK of CC-99677 in healthy adult subjects.
The purpose of this study is to evaluate the ability of PRT064445 to reverse the effects of several blood thinner drugs on laboratory tests. The study also is evaluating the blood levels of PRT064445 given at different doses.
The purpose of this study is to evaluate the ability of PRT064445 to reverse the effects of several blood thinner drugs on laboratory tests. The study also is evaluating the blood levels of PRT064445 given at different doses.
This is a seven-cohort, double-blinded, randomized, sham-controlled feasibility trial to determine whether organ-specific biological effects are achievable through selective ultrasound of the spleen utilizing low-energy insonification.