View clinical trials related to Caffeine.
Filter by:Sleep deprivation (SD) has a powerful degrading effect on cognitive performance, particularly psychomotor vigilance (PV) and reaction time. Caffeine is well known to be an effective countermeasure to the effects of SD. However, individuals differ in both their response to SD and to the administration of caffeine. This has made it difficult to provide individualized recommendations regarding the use of caffeine to sustain alertness when needed. For the past two decades, the Army's Biotechnology HPC Institute (BHSAI), in collaboration with the Walter Reed Army Institute of Research, have been developing statistical models to predict individual performance during prolonged SD. Recently, this resulted in the publication of the 2B-Alert app, a computer algorithm based on large datasets that can learn an individual's response to SD by combining actigraphic sleep data with simultaneously acquired PV performance data. The 2B-Alert algorithm can predict an individual's sleep need and performance after ~2 weeks of training the model. Recently, the model has been extended to incorporate individualized responses to caffeine. This was recently validated in a retrospective study published by BHSAI in 2019. The present study is designed to test the predictive capacity of the 2B-Alert app in real time. During Phase 1 a total of 21 healthy participants will wear an actigraph & complete multiple daily PV tests on a personal cell phone. After 2 weeks, these individuals will attend Phase 2 involving an in-laboratory stay & SD. Participants will have an 8-hour period of sleep in the laboratory, followed by 62 hours of continuous wakefulness. During these 62 hours, participants will complete PV and mood testing every 3 hours. The 2B-Alert app will be used to predict individual caffeine need to sustain performance at near-baseline levels based on the statistical model. At 44 hours SD, participants will undergo a 6-hour "alertness window" where they may receive individualized doses of caffeine based on the recommendations of the model. After 62 hours of SD, Phase 3 begins, involving a night of monitored recovery sleep and additional sessions of PV and mood testing until release from the study at 6 pm on the final day. It is hypothesized that the 2B-Alert app will be effective at providing caffeine dosing recommendations that return PV and mood performance to normal levels during the alertness window.
The aim is to quantify the effects of one dose of caffeine (compared to placebo) on sleep and wakefulness in adolescents.
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.
Cognitive control driven by the prefrontal cortex (PFC) of the brain is thought to be important for goal-directed control over stimulus-driven processes. EEG-measured spontaneous theta/beta ratio (TBR) may potentially be used as an electrophysiological marker for this PFC-mediated cognitive control. In the present study the investigators further examine TBR as an electrophysiological marker for cognitive control, by administering caffeine to forty healthy female participants. After a first training session, participants will visit the lab twice in separate weeks, during which they will orally consume one capsule containing 200mg of caffeine, and one capsule containing a placebo substance (double-blind and random order of administration). EEG will be measured before and after capsule consumption, and cognitive control tasks will be administered after capsule consumption. Generally, the investigators expect that caffeine will decrease TBR and thereby increase cognitive control. Additionally, the investigators expect that individual differences in baseline frontal (reflected by TBR) and central dopaminergic (reflected by spontaneously-measured eye-blink rates; EBR) activity will moderate the relationship between caffeine and cognitive control. Furthermore, the effects of caffeine on specifically hypervigilance for threatening distractors (taking into account a possible moderating role of trait anxiety) were examined as a separate research question.
This study will compare different methods (24 hour urine collection, evening and morning spots, and questionnaires) to measure the consumption of sodium and cafeine in children and adolescents.