View clinical trials related to Caffeine.
Filter by:The aim is to quantify the effects of one dose of caffeine (compared to placebo) on sleep and wakefulness in adolescents.
This study aims to investigate the neurophysiological mechanisms of placebo perceived as caffeine during a motor task. Central and peripheral measures (i.e. electroencephalography and electromyography) will be assessed.
Caffeine is a psychostimulant drug. It acts as a competitive antagonist at adenosine receptors, which modulate cortical excitability as well. In deep brain stimulation (DBS), the production of adenosine following the release of adenosine triphosphate (ATP) explains the reduction of tremor. Binding of adenosine to adenosine A1 receptors suppresses excitatory transmission in the thalamus and hereby reduces both tremor-and DBS-induced side effects. Also, the effect of adenosine was attenuated following the administration of the 8-Cyclopentyl-1,3-dipropylxanthine (DPCPX) adenosine A1 receptor antagonist. Therefore, the presence of a receptor antagonist such as caffeine was suggested to reduce the effectiveness of deep brain stimulation (DBS) in treating tremor and other movement disorders. Based on this finding, the investigators hypothesize that the antagonistic effect of caffeine can tentatively block the excitatory effects of transcranial alternating current stimulation (tACS). The plasticity effects might differ among caffeine users and non- caffeine users depending on the availability of receptor binding sites. Apart from that, a major issue in NIBS studies including those studying motor-evoked potentials is the response variability both within and between individuals. The trial to trial variability of motor evoked potentials (MEPs) may be affected by many factors. Inherent to caffeine is its effect on vigilance. In this study, the investigator shall monitor the participant's vigilance by pupillometry to (1) better understand the factors, which might cause variability in transcranial excitability induction studies and (2) to separate the direct pharmacological effect from the indirect attentional effect of caffeine.
In this multicentric controlled study, we aims to evaluate effect of caffeine on mental performances during a sleep deprivation protocol. Genetic polymorphisms are considered as a covariable.
The aim of the research project is to determine the changes in motivation to perform mental and physical tasks, feelings of vigor and fatigue, mental task vigilance and fine motor function after consumption of a commercially available energy product. The purpose of this study is determine whether e+shot, a product containing natural caffeine, will impact mood and performance up to 108 minutes post consumption compared to a sweetened solution containing synthetic caffeine.
Many trials have been made to prevent paralytic ileus , including administration of prokinetic drugs , early resumption of feeding, gum chewing and adequate pain control. Unfortunately, none of these strategies has been completely successful. Recently the effect of caffeine on prevention of postoperative ileus after caesarian section was researched. That's why this study is designed to determine the efficacy of caffeine in prevention of postoperative ileus after caesarean section.
This study evaluates whether eliminating certain ingredients (caffeine, alcohol, artificial sweeteners, acidic juices) consumed in beverages reduces bladder symptoms of urinary frequency and urgency. Women with overactive bladder will be recruited. Half of these women will receive instructions to replace beverages containing these ingredients with beverages such as water or milk. The other half of participants will receive instructions on following the United States Department of Agriculture guidelines on healthy eating.
Introduction: Gynoid hydrolipodystrophy (HLDG) or cellulitis is a subcutaneous tissue disorder, with several strategies for its treatment, such as caffeine and iontophoresis. Objective: To evaluate the effects of caffeine-associated iontophoresis for the treatment of HLDG. Methods: In a longitudinal study, participants will be evaluated for: photographic documentation, ultrasound imaging, thermography and quality of life questionnaire. If included, they will be separated into 3 randomized groups (n = 30). G1: use of base gel (n = 10); G2: use of iontophoresis and gel with caffeine (n = 10) and G3: use of iontophoresis alone (n = 10). The groups will be treated with 10 sessions, 2 times per week. After that they will be reevaluated. Statistical analysis: The software used will be the SPSS StatisticalPackage (IBM SPSS Statistics, Chicago, IL, USA). The data distribution will be analyzed by the Shapiro-Wilk test. In case of normal distribution, the data will be described as mean ± standard deviation; otherwise, as median [interquartile range 25-75%]. For comparison of the data, we will use ANOVA and for comparison of means the Tukey test and case not normal distribution, krulskal-Wallis test and the Dunns test. The level of statistical significance adopted will be P <0.05. Expected contributions: It is expected that investigators can contribute to the treatment of patients with HLDG and analyze the effects of iontophoresis with caffeine, both in clinical and scientific practice, providing a method that is valid and reliable for this purpose; multidisciplinary training of highly qualified human resources and the strengthening and consolidation of a research team.
Caffeine containing energy drinks (CCED) are beverages that typically contain mixtures of simple sugars, caffeine and may contain vitamin, mineral and/or herbal preparations. In Canada, the consumption of CCEDs among adolescents is a regular occurrence and a common part of the everyday diet. Contributing to the obesity epidemic in youth is the consumption of energy drinks; yet no data on the metabolic responses to CCEDs exists. This study will examine the metabolic implications of CCED consumption in adolescents, aged 13-19 years. The investigators hypothesize that CCEDs will impair glucose tolerance by ~30% in lean adolescents and the primary cause of the insulin resistance will be caffeine. Obese individuals will experience a similar level of glucose impairment, but a greater rise in blood glucose compared to their lean counterparts (i.e. higher starting glucose level). For many, this additional, caffeine-induced rise will expose them to hyperglycemia, putting some individuals in the glucose intolerant or transient diabetic range. It is hypothesized that continued metabolic insult resulting from CCEDs may predispose susceptible individuals to chronic metabolic diseases later in life. The investigators will also examine the genetic basis of caffeine-induced glucose intolerance. This gene-diet interaction could explain why caffeine may be much more metabolically harmful for some individuals compared to others. The study of 'metabolomics' will also be utilized to analyze caffeine and caffeine metabolites such as theobromine, theophylline, and xanthine. This will be accomplished using Nuclear Magnetic Resonance (NMR) spectroscopy. Results from this study will have the potential to alter current perceptions that CCED are 'harmless' and will have far reaching implications for both medical professionals and legislators alike.
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.