View clinical trials related to Physiology.
Filter by:This study aims to determine the effect of acute hypnotic intake (Zolpidem) on sleep, cognitive and motor performances and on acute mountain sickness symptoms at high altitude. Healthy subjects will be evaluated on 4 occasions (twice at sea level and twice at high altitude), after hypnotic or placebo intake. Following an early wake-up (01:00), symptoms, cognitive and motor performances will be assessed to determine potential residual effects of Zolpidem within such conditions.
The investigators want to compare the effects of two drugs, levosimendan and milrinone, on cardiac muscle, both in terms of contractility and relaxation. Half of the participants will be randomized to each drug. The effects will be measured through echocardiographic deformation analyses. Since deformation analyses could be dependent on different loading conditions of the heart, a second purpose of the study is to investigate the changes on deformation parameters after applied changes in preload and afterload, but also heart rate.
The project aims to precisely quantify the postprandial amino acid utilization of egg proteins in vivo in humans, and also to assess their satiating power, in relation with nutrient postprandial waves and incretin secretions. For that purpose, 2 independent studies are conducted. The first one is realized using stable isotopes on 8 volunteers ingesting an egg test meal. The second one is a cross over design performed on 30 volunteers to compare the satiating effect of 2 equivalent snacks: whole eggs or cottage cheese.
Academic phase 1 study which investigates the effects of the two incretin hormones glucose-insulinotropic peptide (GIP) and glucagon-like peptide-1 (GLP-1) on gastric emptying, appetite, insulin release and glucose disposal in the body. The hypothesis is that incretin hormones not only stimulate insulin release but also inhibits gastric emptying. This effect can be utilized for further drug development.
Background Clonidine, a derivate of Imidazol, is an antihypertensive drug. It acts by stimulating adrenergic receptors on nerves in the brain and Imidazol-receptors. As a result, clonidine slows the heart rate and reduces blood pressure. Clonidine was approved by the FDA in 1974 and is registered in Austria with the brand name “Catapresan”. Alpha2 adrenergic agonists are nowadays used topically as eye drops in glaucoma treatment. In addition to their known effect of lowering intraocular pressure, alpha2 adrenoceptor agonists are neuroprotective. Brimonidine, which is the most commonly used topical alpha-2 agonist, is currently on the market for treatment of glaucoma and is effective in reducing intraocular pressure. It has, however, been shown that brimonidine is a very potent vasoconstrictor in the ciliary body thus reducing aqueous humor production. Little is, however, known about potential vasoconstrictor effects of brimonidine in the posterior pole of the eye. This is of clinical importance, because optic nerve head ischemia appears to contribute to glaucoma pathophysiology. Direct investigation of the ocular hemodynamic effects of brimonidine is, however, difficult, because lowering intraocular pressure with brimonidine may confound the results due to the concomitant change in ocular perfusion pressure. The aim of the present study is to assess the effect of intravenous clonidine as model drug of alpha agonists on ocular blood flow and IOP in healthy humans. Study objectives: To investigate effects of clonidine on ocular blood flow and intraocular pressure.