View clinical trials related to Caffeine.
Filter by:The effect of caffeine on appetite and body weight is controversial. Mostly epidemiological studies exist that show either a negative effect (reduction of appetite and body weight) or no effect. In this trial we are going to study the results of the consumption of 5mgr/kgr body weight of caffeine on appetite, food consumption and hormones ghrelin, asprosin, leptin and pancreatic polypeptide in relation to gene polymorphisms that affect caffeine metabolism and body weight. Seventy subjects will participate in a cross sectional study consisting of two trials (with or without the consumption of caffeine) in order to study the aforementioned parameters. Differences of total calories consumption between fast metabolizers of caffeine and the rest of the participants is the primary outcome.
The mechanism of methylxanthines is thought to increase chemoreceptor responsiveness to CO2 in central nervous system. Besides, effect of methylxanthines on diaphragmatic contractility has also been found in experimental studies. A study of premature newborns has showed caffeine increase diaphragmatic activity and tidal volume. But, there is limited data about caffeine direct effect on diaphragma. Objective: The investigators aimed to show the direct effect of caffeine on diphragmatic contractility. Method: The babies under 32 weeks with respiratory support, are being enrolled in this study if caffeine treatment is decided to receive. Evaluation of muscle contraction is being made by ultrasound before and 30 minutes after caffeine loading dose. Right and left sides of diaphragm thickness are being measured by two clinicians on B mode ultrasound by anterior subcostal view. The velocity before and after caffeine administration will be calculated, dividing excursion frequency (parameter) for inspiratory time. Movement of the diaphragm at inspiratory and expiratory phases are also observed on M mode and the difference between the two phases are measured.
Nowadays,caffein is commonly used for AOP, and it reduces the intubation rate in preterm infants. However, intubation is needed in about 20%-50% of partial neonates. How to reduce the intubation rate effectively is a challenge for neonatologists.