Journal articles on the topic 'Caffeinated substances'

We verified whether caffeinated coffee consumption influenced the concentrations of prolactin (PRL) and oxidative stress parameters: total antioxidant status (TAS), ferric reducing antioxidant power (FRAP), total oxidant status (TOS), oxidative stress index (OSI), advanced oxidation protein products (AOPP), uric acid (UA), total bilirubin (T-Bil), albumin (ALB), iron (Fe), calcium (Ca), magnesium (Mg), and inflammatory marker C-reactive protein (CRP)—in blood sera obtained at 15, 60, and 120 minutes after caffeinated coffee intake, in relation to the fasting point. The study participants were 33 young, healthy, nonsmoking volunteers (15 men, 18 women) aged 19-29 years. PRL concentrations significantly decreased ( p < 0.05 ) after consumption, except at time point 15’ in men ( p > 0.05 ). In women, FRAP levels significantly increased over time, and significant changes were also observed for UA at 120’ and ALB at 15’. In men, significant changes were found for levels of AOPP at 15’, T-Bil and ALB at 15’, iron at 60’ and 120’, and calcium at 120’. There were no significant differences in the levels of other examined parameters between the defined time points. In conclusion, the substances contained in caffeinated coffee decrease the level of prolactin and may also have an impact on selected parameters of oxidative stress, which could be the basis of future research focused on the identification of new therapeutic targets.

Multiple studies have shown that the hippocampus is a major part of the limbic system of the brain. It has complex cyclic connections with other brain structures. The hippocampus is an area that stores the sensory information that is associated with effective programs of behavior. The projection of this region in the cortex creates a sense of emotional background, which is a factor of automatic extraction and evaluation of programs, in accordance with past experience, including programs got with a new consciousness. Neurons of hippocampus differ with a severe background activity. Up to 60% of neurons in the hippocampus are responding on the sensory stimulation. Electrical activity is a manifestation of complex shape analyzer processes in stimulating tissues. Changes in activity may indicate the occurrence of adaptive processes that are the result of stress- realizing and stress- limiting systems. One of the main roles in these systems plays hippocampus. The main neurotransmitters of synaptic stimulation in the hippocampus are glutamate. In the hippocampus under conditions of chronic stress are developing neurodegenerative processes in which primary importance belongs to prolonged changes in membrane potential of neurons that potentiate the action of glutamate on nerve cells. Balanced job of synaptic stimulation/inhibition and neurotransmitters systems is underlying the transmission, processing and storage of information in the hippocampus, as well as generating its rhythms, which is a kind of clock operating frequencies of the structure of the brain. Obviously, the various factors that affect the body from the outside can affect on recovery efficiency of electric shift of homeostasis. One of such factors are caffeinated substances, due to their inhibitory effect on phosphodiesterase and interaction with the purine receptors, which ultimately leads to the predominance of stimulating in the brain. In addition, for many decades consumption of caffeinated products with neuro-stimulating properties have greatly increased. Leaders in this list remain coffee and tea. Today the well-known biological effects of caffeinated substances are investigated their chemical composition and process of the transformation in the body. The wide range of research is due to the high consumption of these substances. The environmental factors indirectly or directly, in combination or single affect health, and the caffeinated substances can go to one of the best in strength and impact performance. In neurochemical mechanism of stimulating effect of caffeine plays an important role its ability to bind to specific ("purine" or adenosine) receptors in the brain, the endogenous ligand for which is purine nucleoside – adenosine. The structural similarity of molecules of caffeine and adenosine contributes to this. Since adenosine is seen as a factor that reduces the stimulating processes in the brain, replacing its caffeine results in stimulative effect. Prolonged use of caffeine promotes the formation of new adenosine receptors and the effect of caffeine gradually decreases. However, the sudden cessation of caffeine consumption, adenosine covers all receptors that may lead to increased inhibition with symptoms of fatigue, sleepiness, depression. The relevance of this work is determined by the following observations. Activating mechanism of action of these substances is launching adaptive responses that represent the interaction stress-activating and stress-limiting systems. Energy shortage of the last one under these conditions can appear the cause of many neurodegenerative patalohiy. What may occur in terms of the electroencephalogramm. Electrical activity of the hippocampus, in turn, is one of the indicators of the functional state, which plays an important role in adaptive-compensatory reactions. Therefore, we can assume that prolonged consumption of caffeinated substances can lead to neurodegenerative changes that will show itself in terms of power on hippocampogramm. Therefore, the present study has to identify the dynamics of the bioelectrical activity of the hippocampus of rats under prolonged consumption of caffeinated substances. Experiments were carried out on non-linear white male rats. At the beginning rats were with weight 125–140 g. The animals were divided into 2 groups. The first group consisted of control animals (n = 20). The second group (n = 15) was presented by the animals feeded with pure caffeine in an amount of 150 mg/kg/day. Registration of electrohippocampogramm was performed in acute experiments in the subgroup of 3–5 animals every 2 weeks throughout the study, which lasted for 8 weeks. Background electrical activity of the hippocampus were recorded using standard electrophysiological complex equipment. Recordings started when the electrical activity of the hippocampus disappeared drugs spindle. Each animal spent 10–12 records for 1–2 minutes and then these records are digitally stored on a personal computer and processed using the application package consisting of "MathCAD 2001". Analyzed spectral power (mkV2) and normalized power (%) waves of background electrical activity of the hippocampus within common frequency bands. In the group of animals that continued to receive caffeine in its pure form at the beginning of experiment was observed desynchronization of rhythms in hippocampogramm that after 8 weeks of the study varied synchronization. The results may indicate that the effect of coffeine substances on neurophysiological parameters of electrical activity of the hippocampus of rats reflects one of the many lines of action of some form of nutritional stress, which mechanisms relate to the agreed work and limiting and activating systems of the brain over time.

Background: Sleep is important in maintenance of proper functioning of both mental and physical functions of human body. Studies have shown there is impact on the sleep parameters with the use of caffeine, cigarette and alcohol. As there is little availability of similar studies here in Nepal, we made an attempt to know the relation of consumption of such substances with the sleep quality and sleep parameters as per Pittsburgh Sleep Quality Index scale. Methods: A cross sectional study was conducted among the undergraduate students at BP Koirala Institute of Health Sciences, Dharan. Students were asked to complete a self- administered questionnaire to give information about demographic variables and habit of consumption of caffeinated beverages, cigarette and alcohol. The Pittsburgh Sleep Quality Index was utilized after the permission from authority to evaluate sleep quality. Results: Out of 350, almost half of the students (44.6%) had poor sleep quality. 40.8% students reported sleeping six hours or less per night and 10.1% used medications to sleep. 96% reported consuming caffeinated beverages, 20% consumed cigarettes and 38.3% consumed alcoholic beverages. There was significant association of poor sleep quality with the increased consumption caffeine, cigarette and alcohol (p<0.05). Conclusions: Poor sleep is prevalent among the undergraduate students of B P Koirala Institute of Health Sciences and the consumption of caffeine, cigarette and alcohol is associated with increment in poor sleep quality among them. Keywords: Caffeinated beverages; pittsburgh sleep quality index

Excessive consumption of over-the-counter stimulants is associated with coronary vasospasm, thrombotic complications, and sudden cardiac death. Their effects on cerebrovascular physiology are not yet described in the neurointerventional literature. Patients are increasingly exposed to high levels of these vasoactive substances in the form of caffeinated energy drinks and specialty coffees. We report a case of aneurysmal subarachnoid hemorrhage (SAH) and severe, catheter-induced vasospasm during attempted endovascular repair of a ruptured anterior communicating artery (AComA) aneurysm in the setting of excessive energy drink consumption. We review the literature and alert clinicians to this potentially serious complication.

ObjectiveThis study aimed to determine the prevalence and associated factors of poor sleep quality among pregnant women in Ethiopia.MethodInstitutional based cross-sectional study.SettingUniversity of Gondar Comprehensive Specialized Hospital, Gondar, Ethiopia.ParticipantsA total of 415 pregnant women were recruited by using a systematic random sampling technique from 28 April 2020 to 12 June 2020.MeasurementThe desired data were collected through face-to-face interview technique by using validated questionnaires such as the Pittsburgh Sleep Quality Index, Edinburgh Postnatal Depression Scale, Perceived Stress Scale, Oslo-3 and Abuse Assessment Screen. The data were analysed by using SPSS V.20. Logistic regression analysis was used to identify associated factors with poor sleep quality. Variables having a p value of less than 0.2 in the bivariate analysis were entered to the multivariable logistic regression. A p value of less than 0.05 was considered statistically significant, at 95% CI.ResultIn this study, 175 (42.2%) pregnant women had poor sleep quality. According to multivariable logistic regression, being first and third trimesters of gestational age (adjusted OR (aOR) 2.31, 95% CI 1.16 to 4.61 and aOR 3.45, 95% CI 2.05 to 5.79, respectively), consumption of caffeinated substances (aOR 2.96, 95% CI 1.68 to 5.52), having depression (aOR 2.12, 95% CI 1.19 to 3.76), having high perceived stress (aOR 5.39, 95% CI 1.96 to 14.79) and experience of intimate partner violence (aOR 5.57, 95% CI 2.19 to 14.68) were positive significant associated factors with poor sleep quality.Conclusion and recommendationThe prevalence of poor sleep quality among pregnant women was relatively high. First and third trimesters, consumption of caffeinated substances, antenatal depression, high perceived stress and intimate partner violence were factors significantly associated with poor sleep quality. This result suggests that all pregnant women should be screened and treated for poor sleep quality during the first and third trimesters.

While caffeine ingestion is commonplace, there is a relative lack of research on normative standards of caffeine consumption. The present investigation surveyed two hundred and seventy students at a midwestern state university concerning their consumption of various caffeine products. The results of the investigation suggest that there is an identifiable group of individuals who use excessive amounts of caffeine. The survey has also identified several deleterious effects that may be related to caffeine use. The most important finding of the study was that roughly 75 percent of the individuals who use caffeinated products rarely sought information concerning the caffeine content of the products they were using nor did they attempt to avoid substances containing caffeine. Suggestions for education and prevention are offered.

Recent pharmacoepidemiologic studies suggest that pharmacological neuroenhancement (pNE) and mood enhancement are globally expanding phenomena with distinctly different regional characteristics. Sociocultural and regulatory aspects, as well as health policies, play a central role in addition to medical care and prescription practices. The users mainly display self-involved motivations related to cognitive enhancement, emotional stability, and adaptivity. Natural stimulants, as well as drugs, represent substance abuse groups. The latter comprise purines, methylxanthines, phenylethylamines, modafinil, nootropics, antidepressants but also benzodiazepines, β-adrenoceptor antagonists, and cannabis. Predominant pharmacodynamic target structures of these substances are the noradrenergic/dopaminergic and cholinergic receptor/transporter systems. Further targets comprise adenosine, serotonin, and glutamate receptors. Meta-analyses of randomized-controlled studies in healthy individuals show no or very limited verifiability of positive effects of pNE on attention, vigilance, learning, and memory. Only some members of the substance abuse groups, i.e., phenylethylamines and modafinil, display positive effects on attention and vigilance that are comparable to caffeinated drinks. However, the development of new antidementia drugs will increase the availability and the potential abuse of pNE. Social education, restrictive regulatory measures, and consistent medical prescription practices are essential to restrict the phenomenon of neuroenhancement with its social, medical, and ethical implications. This review provides a comprehensive overview of the highly dynamic field of pharmacological neuroenhancement and elaborates the dramatic challenges for the medical, sociocultural, and ethical fundaments of society.

AbstractYaupon (the unfortunately named Ilex vomitoria) is a holly commonly used as yard décor in the southeast United States, but many North Americans will be surprised to learn that it is the source of a stimulant tea that has been in continuous use for nearly a millennium. Yaupon is more than a drink; it is a window into questions of identity, community belonging, and how the New World was inserted into the global economy. From Cabeza de Vaca's sixteenth-century brush with the beverage, yaupon has iterated between ceremony, medicine, and caffeinated tea as inhabitants of North America—Indigenous, enslaved, and settler colonial inhabitants of North America—have harnessed the leaf's properties to different, culturally situated aims. This article traces narratives, recipes, and medical descriptions of yaupon from contact to the present, and compares these against material and archeological records to explore differences between settler and extractive colonial encounters with Indigenous psychoactive substances (and thus indigeneity). The story of yaupon reveals contests between regimes of knowledge, the political economy of colonialisms, and the fraught intersections of identity and cuisine. Despite abundant ethnographic, documentary, and scientific evidence to the contrary, the scientific and medical literature long mislabeled yaupon as emetic. This raises questions about how knowledge is transferred and how scientific authority is constructed. I argue that indigeneity, race, and class have steered how yaupon has been understood, and help to explain why a popular caffeinated product waned at a time when the use of stimulants was increasing, and “proletarian hunger-killers” were on the rise.

Caffeine is one of the most used psychoactive substances worldwide, with an impact in multiple spheres (individual, social, and economic). In addition, there is evidence of the physiological, cognitive, and emotional effects after consumption. This study aimed to examine caffeine consumption in a Portuguese sample by characterizing and understanding the pattern of consumption and the reasons for it. The sample was composed of 208 subjects recruited through the university’s social media channels to answer an online questionnaire between April and June 2020. The results showed a higher consumption in males and the group of subjects aged between 31 and 35 years. The coffee “express” is the most consumed source of caffeine in this Portuguese sample (70.2%). The data showed that improvement in alertness and the taste of products with caffeine were the main reasons for consuming caffeinated products. In conclusion, this study calls attention to the characterization of caffeine consumption to understand the need for such consumption and its effects on body functions and health. It is important to highlight the potential benefit of caffeine consumption due to its impact on the quality of life and health since this substance has effects not only on physical and mental health but also on social well-being.

Background: Schizophrenia is a serious mental illness that can relapse after treatments. Risk and protective factors for relapse are dependent on multicultural contexts. Objective: To identify risk and protective factors related to relapse in first-episode schizophrenia (FES) in northeastern Thailand from perspectives of health professionals. Methods: This qualitative research collected data from 21 health professional staff members (psychiatric nurses, psychiatrists, psychologists, social workers, occupational therapists and nutritionist) of a tertiary psychiatric hospital of northeastern Thailand who had been involved in mental health care for schizophrenia for at least 5 years by in-depth interviews and group interview using semi-structured interview schedule. Content analyses was used to identify staff perception of factors that put patients at risk of relapse. Results: Data analyses demonstrated that factors related to relapse in FES patients were drug adherence (drug discontinuation, limited access to new generation drugs, self-dose reduction and skipping medication, and poor insight), family factors (stressful circumstances and family supports), substance abuses (narcotics, addictive substances, caffeinated drinks), concurrent medical illness (insomnia, thyroid diseases, and pregnancy-related hormonal changes), and natural course of disease. Conclusion: Factors affecting relapse in FES was not only drug adherence. Family factors, drug abuses, and concurrent health status should be also taken into account. A comprehensive mental health care program should be developed for FES patients in the region.

AbstractCaffeinated beverages are the most consumed substances in the world. High rate of uptake of these beverages leads to various cardiovascular disorders ranging from palpitations to coronary failure. The objective of the study is to ascertain how the complexity parameters of heart rate variability are affected by acute consumption of caffeinated beverages in young adults.Electrocardiogram measurements were performed before consuming drinks. After consuming the drinks, measurements were done again at 30 minutes and 60 minutes. Heart rate variability signals were acquired from electrocardiogram signals. Also, the signals were reconstructed in the phase space and largest Lyapunov exponent, correlation dimension, approximate entropy, and detrended fluctuation analysis values were calculated.Heart rate increased for energy drink and cola groups but not in coffee group. Non-linear parameter values of energy drink, coffee, and cola group are increased within 60 minutes after drink consumption. This change is statistically significant just for energy drink group.Energy drink consumption increases the complexity of the cardiovascular system in young adults significantly. Coffee and cola consumption have no significant effect on the non-linear parameters of heart rate variability.

Background: The association between coffee/tea intake and hypertensive disorders of pregnancy (HDP) remains unclear. This study aimed to investigate the association of caffeine, coffee, and tea intake during pregnancy with the risk of HDP. Methods: We assessed this association in 85,533 singleton pregnant women with live births in the Japan Environment and Children’s Study, a prospective cohort in Japan that included women from early pregnancy onward. Caffeinated and decaffeinated coffee and tea (green, oolong, and black) consumption during pregnancy was assessed using a validated food frequency questionnaire conducted at mid-pregnancy, and caffeine intake was calculated based on coffee and tea consumption. Multivariable logistic regression was used to assess the association with the risk of HDP. Results: HDP developed in 2222 women (2.6%). Caffeine intake was weakly associated with increased risk of HDP; the multivariable odds ratio of HDP for the highest versus the lowest quartile was 1.26 (95% confidence interval: 1.11, 1.43). Coffee drinkers of two or more cups per day showed a decreased risk compared with non-drinkers (multivariable odds ratio 0.79; 0.62, 0.99) even after adjustment for total caffeine intake. Tea consumption was not associated with the risk of HDP. Conclusions: Our study suggests that higher caffeine intake may increase HDP risk, while coffee drinkers had a lower risk. Further high-quality studies are needed to replicate these findings, and to elucidate if other substances in coffee may be protective against HDP.

Caffeine is one of the most widely consumed behavioral substances. We have previously shown that caffeine- and theophylline-induced inhibition of renal reabsorption causes diuresis and natriuresis, an effect that requires functional adenosine A1 receptors. In this study, we tested the hypothesis that blocking the Gi protein-coupled adenosine A1 receptor via the nonselective adenosine receptor antagonist caffeine changes Na+/H+ exchanger isoform 3 (NHE3) localization and phosphorylation, resulting in diuresis and natriuresis. We generated tubulus-specific NHE3 knockout mice (Pax8-Cre), where NHE3 abundance in the S1, S2, and S3 segments of the proximal tubule was completely absent or severely reduced (>85%) in the thick ascending limb. Consumption of fluid and food, as well as glomerular filtration rate, were comparable in control or tubulus-specific NHE3 knockout mice under basal conditions, while urinary pH was significantly more alkaline without evidence for metabolic acidosis. Caffeine self-administration increased total fluid and food intake comparably between genotypes, without significant differences in consumption of caffeinated solution. Acute caffeine application via oral gavage elicited a diuresis and natriuresis that was comparable between control and tubulus-specific NHE3 knockout mice. The diuretic and natriuretic response was independent of changes in total NHE3 expression, phosphorylation of serine-552 and serine-605, or apical plasma membrane NHE3 localization. Although caffeine had no clear effect on localization of the basolateral Na+/bicarbonate cotransporter NBCe1, pretreatment with DIDS inhibited caffeine-induced diuresis and natriuresis. In summary, NHE3 is not required for caffeine-induced diuresis and natriuresis.

AbstractBackground:Caffeine antagonizes the intoxicating effects of alcohol. Consequently, there has been a dramatic global increase in the consumption of caffeinated drinks together with alcohol, especially among young adults. We assessed the seizure vulnerability and anxiety responses following the chronic co-administration of, and withdrawal from, caffeine and ethanol in male rats.Methods:The rats were randomly assigned to six groups consisting of 10 animals each: 10 mg/kg of caffeine, 20 mg/kg of caffeine, 4 g/kg of 20% ethanol, combined caffeine (20 mg/kg) and ethanol (4 g/kg of 20%), 4 mL/kg distilled water, and an untreated control group. The test substances were administered intragastrically twice daily for 29 days. On day 29, the rats were tested on the elevated plus maze to assess anxiety-related responses. On day 30, pentylenetetrazol (PTZ), a chemoconvulsant, was administered intraperitoneally at a dose of 40 mg/kg to the animals. Seizure responses and mortality up to 72 h were recorded.Results:Compared with the control group, the rats that received chronic treatment with low-dose caffeine, ethanol alone, and combined caffeine and ethanol exhibited significant anxiogenic-like effects, unlike with high-dose caffeine. Both low- and high-dose caffeine significantly increased PTZ seizure latency. Ethanol alone and combined caffeine and ethanol both lowered PTZ seizure latency. No significant difference occurred between the controls and the untreated group for either anxiety or seizure expression. Combined caffeine and ethanol increased the seizure-induced mortality from withdrawal effects at 72 h.Conclusions:These findings suggest that the chronic co-administration of caffeine and ethanol and the acute withdrawal from these drugs lead to anxiogenic effects and increased seizure vulnerability.

There is a growing trend of using energy drinks and caffeinated beverages to improve cognitive performance that is widespread and well-studied among children and teenagers with Attention Deficit Hyperactive Disorder (ADHD), but little is known about adult ADHD (A-ADHD). As a consequence, the use of highly caffeinated drinks and their impact on ADHD symptoms are poorly understood. This is especially true in populations where A-ADHD and the use of these beverages are largely represented, such as in military samples. From the All Army Study (AAS) of the Army Study to Assess Risk and Resilience in Service members (STARRS) data, 1,239 A-ADHD soldiers and 17,674 peers without any psychiatric comorbidity were selected. The two groups were compared on: (1) the presence of substance use disorder (SUD) diagnosis both over their lifetime and in the previous 30 days; (2) patterns of alcohol and caffeine use using chi-square analyses. Lastly, the relationship between substance use and severity of A-ADHD symptoms was assessed using Pearson’s correlations. Soldiers with a diagnosis of A-ADHD had a higher prevalence of SUD diagnosis compared to their peers without psychiatric comorbidity. They also tended to use more alcohol, caffeine pills, energy drinks, and other caffeinated drinks. Alcohol use was positively correlated with A-ADHD symptoms; on the contrary, energy drinks, caffeine pills and other caffeinated drinks showed negative correlations with some aspects of A-ADHD symptomatology. The use of caffeinated compounds appears to be increased among military soldiers with ADHD, and they may help reducing A-ADHD symptoms and improve cognitive performance. These results suggest a possible role for caffeine as a potential pharmacological tool in the treatment of adult ADHD.

This study assessed the knowledge, prevalence, and quantity of caffeine use by athletes competing at the 2005 Ironman Triathlon World Championships. Caffeine-related questionnaires were self-administered to 140 (105 male and 35 female, 40.3 ± 10.7 y) athletes representing 16 countries. Fifty of these athletes further consented to immediate post-race blood samples for analysis of plasma caffeine and paraxanthine using high-performance liquid chromatography (HPLC). Seventy-two percent of 70 athletes correctly identified caffeine as being an unrestricted substance in triathlon. The majority of athletes [125 (89%)] were planning on using a caffeinated substance immediately prior to or throughout the race. Cola drinks (78%), caffeinated gels (42%), coffee (usually pre-race) (37%), energy drinks (13%), and NoDoz tablets (9%) were the most popular caffeinated choices. Mean ± standard deviation (and range) post race plasma caffeine and paraxanthine levels were 22.3 ± 20 μmol/L (1.7 to 98.4) and 9.4 ± 6 μmol/L (1.8 to 28.9), respectively. Seven athletes (14%) finished with plasma caffeine levels > 40 μmol/L. Plasma values from elite athletes did not differ from age group competitors. Despite the prevalence of its consumption and the training experience of this athletic group, over one quarter of athletes remained either confused or uninformed about caffeine’s legality. Levels of plasma caffeine taken immediately post race indicated that athletes typically finish with quantities of caffeine that have been shown to improve endurance performance (i.e., ~ 20 μmol/L or a dose of > 3 mg/kg body weight).

ABSTRACT Background Caffeine is the most frequently used psychoactive substance in the United States and &gt;90% of reproductive-age women report some amount of intake daily. Despite biological plausibility, previous studies on caffeine and fecundability report conflicting results. Importantly, prior studies measured caffeine exposure exclusively by self-report, which is subject to measurement error and does not account for factors that influence caffeine metabolism. Objectives Our objective was to examine associations between preconception serum caffeine metabolites, caffeinated beverage intake, and fecundability. Methods Participants included 1228 women aged 18–40 y with a history of 1–2 pregnancy losses in the EAGeR (Effects of Aspirin in Gestation and Reproduction) trial. We prospectively evaluated associations of preconception caffeine metabolites (i.e., caffeine, paraxanthine, and theobromine) measured from 1191 serum samples untimed to a specific time of day, self-reported usual caffeinated beverage intakes at baseline, and time-varying cycle-average caffeinated beverage intake, with fecundability. Using Cox proportional hazards models, we estimated fecundability odds ratios (FORs) and 95% CIs according to each metabolite. Follow-up was complete for 89% (n = 1088) of participants. Results At baseline, 85%, 73%, and 91% of women had detectable serum caffeine, paraxanthine, and theobromine, respectively. A total of 797 women became pregnant during ≤6 cycles of preconception follow-up. After adjusting for potential confounders, neither serum caffeine [tertile (T)3 compared with T1 FOR: 0.87; 95% CI: 0.71, 1.08], paraxanthine (T3 compared with T1 FOR: 0.92; 95% CI: 0.75, 1.14), nor theobromine (T3 compared with T1 FOR: 1.15; 95% CI: 0.95, 1.40) were associated with fecundability. Baseline intake of total caffeinated beverages was not associated with fecundability (&gt;3 compared with 0 servings/d adjusted FOR: 0.99; 95% CI: 0.74, 1.34), nor was caffeinated coffee (&gt;2 compared with 0 servings/d adjusted FOR: 0.93; 95% CI: 0.45, 1.92) or caffeinated soda (&gt;2 servings/d adjusted FOR: 0.92; 95% CI: 0.71, 1.20). Conclusions Our findings are reassuring that caffeine exposure from usual low to moderate caffeinated beverage intake likely does not influence fecundability. This trial was registered at clinicaltrials.gov as NCT00467363.

Background: To date, no study has investigated the effects of acute intake of caffeinated chewing gum in female basketball players. Methods: Nine elite female basketball players participated in a randomized crossover placebo-controlled double-blind experiment. All athletes participated in two identical experimental trials 15 minutes after ingestion of (i) chewing gum containing 150 mg of caffeine (i.e.~2.3 ± 0.2 mg/kg of caffeine) or (ii) non-caffeinated chewing gum with an inert substance to produce a placebo. After the ingestion of the gum, the athletes performed the following tests: (i) a sprint test (0-20 m), (ii) agility T-test, (iii) isometric handgrip strength test, (iv) countermovement jump test, (v) free throw test, and (vi) three-point shot test. Results: No significant differences were observed in any physical or skill-based tests (p > 0.05 for all). However, the effect size in the sprint and agility T-Test, jump height test, and free-throw test was higher in the caffeine conditions, with effect sizes of small or moderate magnitude (ES = 0.31 – 0.64) over the placebo. Conclusion: From a practical perspective, the benefits of caffeinated chewing gum are minor, at least in elite athletes with a mild level of caffeine consumption.

Objectives. Past several studies have proven that caffeine facilitates attentional enhancement by acting as an adenosine antagonist once it is absorbed by the body, resulting in improved psycho-behavioral function. Modern clinical olfactory function tests are usually assessed by psychophysical tests but due to a paucity of data, the influence of enhanced attention by caffeine on olfactory function still remains unclear. The objective of this study was to compare results of cognitive function (attention) and olfactory function before and after caffeine administration in order to analyze effects of caffeine on olfactory function in normosmic subjects.Methods. This study enrolled 49 participants of Konkuk University Hospital with a mean age of 27.7 years who had patent olfactory clefts and no olfactory dysfunction from May 2015 to February 2016. Subjects were restrained from caffeine 10 hours before the test. On day 1, participant’s subjective olfactory function was evaluated before and after uptake of either caffeinated or decaffeinated coffee using visual analog scale (VAS) score, minimum cross-sectional area (MCA) measured by acoustic rhinometry, and the Korean version of Sniffin’ Stick II (KVSS II). Evaluation of participant’s attentional degree was measured by d2 test. On day 2, the same procedure was carried out with counterpart substance. The type of coffee initially administrated was randomly selected.Results. After administration, caffeinated coffee resulted in significant attentional enhancement than decaffeinated coffee. Results of d2 test showed statistically significant differences in the parameters of total number of errors and omission errors. In both the caffeinated and decaffeinated groups, the patients showed slight increase in VAS score and nasal cavity area; however, the difference was not statistically significant. Also, caffeinated coffee intake compared to decaffeinated coffee intake showed no significant relevance to olfactory function.Conclusion. Caffeine may significantly improve attentional congnitive function, while not have acute effects on olfactory function.

Caffeine-related health incidents in New Zealand have escalated over the last two decades. In order to reduce the risk of substance-related harm, it is important to understand the consumers’ motivations for its use. This is especially true for tertiary students who are presumed to be at a higher risk due to seeking out caffeine’s well-known cognitive benefits as well as the targeted marketing of such products to young adults. This study examined the habits and motivations for caffeine consumption in tertiary students in New Zealand. A previously validated caffeine consumption-habits (CaffCo) questionnaire was administered online to 317 tertiary students (n = 169 females), aged ≥16 years. Of the 99.1% of participants who regularly consumed caffeine, coffee (76.3%) tea (71.6%) and chocolate (81.7%) consumption were the most prevalent. Motivations for caffeinated-product consumption differed according to caffeine source. Tea was consumed for the warmth and taste, coffee was consumed to stay awake and for warmth, and chocolate, for the taste and as a treat. Marketing was not identified by participants as influencing their consumption of caffeinated products. Knowledge of motivations for caffeine consumption may assist in identifying strategies to reduce caffeine intake in those New Zealand tertiary students who regularly consume amounts of caffeine that exceed safe level.

AbstractBackgroundPoor mental health has consistently been associated with substance use (smoking, alcohol drinking, cannabis use, and consumption of caffeinated drinks). To properly inform public health policy it is crucial to understand the mechanisms underlying these associations, and most importantly, whether or not they are causal.MethodsIn this pre-registered systematic review, we assessed the evidence for causal relationships between mental health and substance use from Mendelian randomization (MR) studies, following PRISMA. We rated the quality of included studies using a scoring system that incorporates important indices of quality, such as the quality of phenotype measurement, instrument strength, and use of sensitivity methods.ResultsSixty-three studies were included for qualitative synthesis. The final quality rating was ‘−’ for 16 studies, ‘– +’ for 37 studies, and ‘+’for 10 studies. There was robust evidence that higher educational attainment decreases smoking and that there is a bi-directional, increasing relationship between smoking and (symptoms of) mental disorders. Another robust finding was that higher educational attainment increases alcohol use frequency, but decreases binge-drinking and alcohol use problems, and that mental disorders causally lead to more alcohol drinking without evidence for the reverse.ConclusionsThe current MR literature increases our understanding of the relationship between mental health and substance use. Bi-directional causal relationships are indicated, especially for smoking, providing further incentive to strengthen public health efforts to decrease substance use. Future MR studies should make use of large(r) samples in combination with detailed phenotypes, a wide range of sensitivity methods, and triangulate with other research methods.

BackgroundPatients with co-existence of psychiatric disorders and substance use have an increased risk of premature death. This is attributable to a higher prevalence of physical comorbidities and the lifestyle related to substance use. Furthermore, they experience low quality of life (QoL). Studies addressing lifestyle interventions for these patients are warranted.AimsTo investigate the physical health and QoL in patients with co-existence of psychiatric disorders and substance use, and to analyse for changes in their (a) health, (b) substance use and (c) QoL after a 24-month health-promotion programme. Further aims were to investigate associations between (a) QoL and number of interventions, (b) QoL and patient characteristics and (c) QoL and length of participation in the intervention.MethodsIn this naturalistic cohort study, 64 non-selected patients were engaged in health-promoting interventions added to contemporary treatments. QoL and clinical variables were measured at the beginning of and continuously during the programme by means of the WHOQoL-Bref questionnaire.ResultsAt enrolment, the patients’ intake of cannabis and alcohol was high. During follow-up, patients consumed significantly fewer caffeinated beverages (P = 0.038) and fast-food meals (P = 0.018), and slept significantly less (P = 0.032). The average dose of antipsychotic medication increased significantly (P = 0.015). QoL was low at enrolment but improved significantly overall (P = 0.009) and in the psychological (P = 0.020) and environmental domains (P = 0.012) at follow-up. The difference in total QoL was positively associated with the number of interventions attended.ConclusionThis programme shows promise in addressing health promotion for these patients and can easily be integrated into contemporary treatments.Disclosure of interestThe authors have not supplied their declaration of competing interest.

Background: The consumption of caffeinated energy drinks is a common practice among college students. Energy drinks are believed to increase energy, stamina, wakefulness, and reduce hangover symptoms. Aims and Objective: This study aims to find out the profile, pattern, practice of energy drink and substance use among undergraduate students in BP Koirala Institute of Health Sciences. Materials and Methods: It was a self-reported questionnaire based descriptive cross-sectional study. The questionnaire included demographic details, patterns of energy drink used, mixing practice of alcohol with energy drinks or other beverages, substance use behavior, and the knowledge about the main constituents of energy drinks. Alcohol mixing practice was further categorized into a) Alcohol + Energy drink mixing group, b) Alcohol + Other beverages mixing group, c) Only Alcohol group. Results: Out of 319 students, 188 (58.9%) were male. The prevalence of energy drink use was 186 (58.3%). Red Bull (176, 94.6%) was the most preferred energy drink. The use of alcohol (29, 87.9%), tobacco (20, 60.6%), and marijuana (13, 39.4%) was more prevalent in students using energy drinks on a daily basis. Thirty percent (57) alcohol user students were mixed alcohol with energy drink among them 42 (73.7%) used tobacco and 24 (42.1%) used marijuana. Conclusion: The overall energy drinks use among the students was high. The occurrence of various substance misuse was more among those students who consumed energy drink more frequently or consumed it with alcohol. Frequent consumption of energy drinks alone or mix with alcohol is not recommended.

Caffeine has been described as a sports performance-enhancing substance. However, it is unclear whether it can increase the level of physical activity (PA) in nonathletic individuals. This study investigates the relationship between daily caffeine consumption and (a) daily PA/fitness or (b) intervention-induced changes in PA in women and men. On the basis of responses to a dietary habit questionnaire, which included items on caffeinated beverages, 1,032 Japanese adults, were categorized into lower or higher caffeine consumption groups (relative to the median caffeine consumption). In each group, daily step count; sedentary time; and light, moderate, and vigorous PA outcomes were objectively measured. Physical fitness, including peak oxygen consumption, was also evaluated. The relationship between daily caffeine consumption and the change in the levels of PA was investigated in a subgroup of 202 subjects who participated in a 1-year PA counseling intervention. Women in the higher caffeine consumption group presented higher moderate-to-vigorous PA and step count compared with their counterparts in the lower consumption group (4.0 ± 2.1 vs. 3.3 ± 2.1 MET-hr/day, p < .001; 10,335 ± 3,499 vs. 9,375 ± 3,527 steps/day, p < .001). A significant positive correlation was noted between caffeine consumption and peak oxygen consumption among women (r = .15, p < .001). No caffeine-related effects were noted in men. The lower and higher caffeine consumption groups showed no significant differences in their levels of PA at the end of the 1-year intervention. Therefore, caffeine consumption appears to be associated with higher levels of PA in Japanese women. Further studies are needed to clarify this association.

Background. Problematic Internet use is characterized by excessive or poorly controlled preoccupations, urges, or behavior regarding computer use and Internet access which lead to impairment or distress. It has been found that the occurrence rate of problematic Internet use among university students ranges from 0.8% to 47.7%. Despite this, there are multiple challenges that relate to problematic Internet use, which remain underrecognized and largely ignored by stakeholders and are not well known, especially in low-income countries, including Ethiopia. Therefore, this study was conducted aiming to assess the prevalence of problematic Internet use and its associated factors among undergraduate students. Methods. Cross-sectional study was employed from May 1st to June 1st, 2019. A multistage sampling technique was used to get a total of 846 undergraduate students. Data were collected by using self-administered structured questionnaires of Young’s Internet Addiction Test. The collected data were coded and entered into EpiData 3.1 and analyzed by using SPSS version 22; bivariate and multivariate logistic regression analysis was conducted to identify factors associated with problematic Internet use, and statistical significance was considered at P value <0.05. Results. For a total of 846 study participants, the response rate was 761 (90%) and the prevalence of problematic Internet use was 19.4%. Multiple logistic regression model revealed that being male [AOR = 1.69, 95% CI: 1.80, 6.41], depression [AOR = 3.61, 95% CI: 2.40, 5.43], and khat or caffeinated drinks [AOR = 1.86, 95% CI: 1.21, 2.87] were significantly associated with problematic Internet use. Conclusion. This study revealed that there was high prevalence of problematic Internet use among Dilla University students and there were various factors associated with increased prevalence of problematic Internet use. Therefore, students need to be educated about the safe, valuable, and healthy practices of Internet use. Furthermore, it is better to counsel on substance use and its consequences to overcome the anticipated increase in problematic Internet use.

Common Causes of Sleeplessness Include: (1) Stress – Concerns about work, school, health, finances, or family can keep your mind active at night, making it difficult to sleep. Stressful life events or trauma – such as the death or illness of a loved one, divorce, or a job loss can lead to stress. (2) Travel or work schedule – Disrupting your body’s circadian rhythms can lead to lack of sleep. Causes include jet lag from traveling across multiple time zones, working a late or early shift, or frequently changing shifts. (3) Poor sleep habits – Poor sleep habits include an irregular bedtime schedule, naps, stimulating activities before bed, an uncomfortable sleep environment, and using your bed for work, eating, or watching TV. Computers, TVs, video games, smartphones, or other screens just before bed can interfere with your sleep cycle. (4) Eating too much late in the evening – Having a light snack before bedtime is OK, but eating too much may cause you to feel physically uncomfortable while lying down. Many people also experience heartburn, a backflow of acid, and food from the stomach into the esophagus after eating, which may keep you awake. (5) Mental health disorders – Anxiety disorders, such as post-traumatic stress disorder, may disrupt your sleep. Awakening too early can be a sign of depression. (6) Medications – Many prescription drugs can interfere with sleep, such as certain antidepressants and medications for asthma or blood pressure. Many over-the-counter medications – such as some pain medications, allergy, and cold medications, and weight loss products – contain caffeine and other stimulants that can disrupt sleep. (7) Medical conditions – Examples of conditions linked with insomnia include chronic pain, cancer, diabetes, heart disease, asthma, gastroesophageal reflux disease (GERD), overactive thyroid, Parkinson’s disease, and Alzheimer’s disease. (8) Sleep-related disorders – Sleep apnea causes you to stop breathing periodically throughout the night, interrupting your sleep. Restless legs syndrome causes unpleasant sensations in your legs and an almost irresistible desire to move them, which may prevent you from falling asleep. (9) Caffeine, nicotine, and alcohol – Coffee, tea, cola, and other caffeinated drinks are stimulants. Drinking them in the late afternoon or evening can keep you from falling asleep at night. Nicotine in tobacco products is another stimulant that can interfere with sleep. Alcohol may help you fall asleep, but it prevents deeper stages of sleep and often causes awakening in the middle of the night. Complications of Insomnia May Include: (1) Lower performance on the job or at school. (2) Slowed reaction time while driving and a higher risk of accidents. (3) Mental health disorders, such as depression, an anxiety disorder, or substance abuse. (4) Increased risk and severity of long-term diseases or conditions, such as high blood pressure and heart disease. Prevention: Good sleep habits can help prevent insomnia and promote sound sleep: (1) Keep your bedtime and wake time consistent from day to day, including weekends. (2) Stay active – regular activity helps promote a good night’s sleep. (3) Check your medications to see if they may contribute to insomnia. (4) Avoid or limit naps. (5) Avoid or limit caffeine and alcohol, and do not use nicotine. (6) Avoid large meals and beverages before bedtime. (7) Make your bedroom comfortable for sleep and only use it for sex or sleep. (8) Create a relaxing bedtime ritual, such as taking a warm bath, reading, or listening to soft music. Conclusion: Sleep deprivation is helping no one except the market. Brands are capitalizing on our lack of sleep, on our habits. Who are we giving excuses to, our web series can be paused, late night conversation can

Introduction: Pharmacological neuroenhancement (PN) is a topic of increasing importance and prevalence among students. However, there is a lack of differentiating PN substances, according to their psychoactive effects. In particular, there is a lack of data about PN by caffeinated drinks, even if coffee is a common and broadly used Neuroenhancer because of its cognitively enhancing effects regarding wakefulness, alertness and concentration.Materials and Methods: A web-survey was developed for German students and alumni about the non-medical use of caffeine for PN contained questions about coffee, caffeinated drinks and energy drinks, caffeine pills and methylxanthine tea regarding frequency and further contextual factors.Results: Six hundred and eighty-three participants completed the survey. Nearly all participants knew about PN (97.7%). 88.1% admitted using some over-the-counter substances. For PN purposes, coffee was used by 72.9% followed by energy drinks (68.2%) and cola drinks (62.4%). Methylxanthine containing tea was used for PN purposes, too (black tea 52.3%, green tea 51.7%). 1.8% admitted using illegal substances or prescription drugs, too.Discussion: Using legal methylxanthine containing drinks for PN seems to be extremely common with coffee and energy drinks being the preferred substances, while illegal and prescription drugs are only minimally used. Further studies should investigate the awareness of methylxanthine containing drinks as well as its character to be a flavoring drink or a neuroenhancer.

Caffeinated energy drinks are commonly taken to improve exercise performance, but there are few studies on the influence of different doses on an athlete’s performance. We conducted a double-blind, randomized, counter-balanced, and crossover research study to examine the effects of low caffeinated energy drink (Low ED) or high caffeinated energy drink (High ED) supplement on the performance, haematological response, and oxidative stress in triathletes. Twelve male participants underwent three testing sessions separated by weekly intervals, consisting of sprint triathlon training (0.75 km swim, 20 km cycle, and 5 km run). Before and during the trials, participants were randomly provided with either placebo (PLA) group, Low ED group, or High ED group. Exercise performance in the High ED group decreased significantly compared with the PLA and Low ED groups (p &lt; 0.05). However, participants in the Low ED group also experienced an improved performance (p = 0.054). Analysis of variance revealed no differences among the three groups in cortisol and testosterone levels, or the Borg Rating of Perceived Exertion score (p &gt; 0.5). Furthermore, superoxide dismutase (SOD) was reduced with exercise and were lowest in the High ED group. However, compared with PLA, a significant decrease of thiobarbituric acid reactive substances (TBARS) was observed in Low ED and High ED groups (p &lt; 0.05). This indicates that caffeinated energy drink consumption may improve performance and reduce oxidative stress in sprint triathlon athletes. However, individual differences should be considered when supplementing with caffeinated energy drinks to decrease side effects.

Abstract Purpose Caffeinated beverages are consumed daily throughout the world. Caffeine consumption has been linked to dysfunction of the autonomic nervous system. However, the exact effects are still insufficiently understood. Methods Sixteen healthy individuals were included in the present non-randomized cross-over interventional study. All study subjects consumed a commercial energy drink (containing 240 mg caffeine), and in a second independent session coffee (containing 240 mg caffeine). High-resolution digital ECGs in Frank-lead configuration were recorded at baseline before consumption, and 45 min after consumption of the respective beverage. Using customized software, we assessed ECG-based biomarker periodic repolarization dynamics (PRD), which mirrors the effect of efferent cardiac sympathetic activity on the ventricular myocardium. Results The consumption of energy drinks resulted in an increase in PRD levels (3.64 vs. 5.85 deg2; p < 0.001). In contrast, coffee consumption did not alter PRD levels (3.47 vs 3.16 deg2, p = 0.63). The heart rates remained unchanged both after coffee and after energy drink consumption. Spearman analysis showed no significant correlation between PRD changes and heart rate changes (R = 0.34, p = 0.31 for coffee, R = 0.31, p = 0.24 for energy drink). Conclusion Our data suggests that sympathetic activation after consumption of caffeinated beverages is independent from caffeine and might be mediated by other substances. Trial Number: NCT04886869, 13 May 2021, retrospectively registered

Introduction: Coffee has been inversely associated with Parkinson's disease (PD) in many studies, and caffeine is the leading candidate to mediate this effect. Mate (Ilex paraguariensis, IP), a caffeinated beverage rich in antioxidants consumed in South America, was also inversely associated with PD in one study from Argentina. Other varieties of IP infusion, such as chimarrão, were never studied in PD. Chimarrão is a common caffeinated beverage consumed in Brazil made with the leaves and stems of IP.Methods: A case–control study was conducted to evaluate the relationship between chimarrão ingestion and PD in southern Brazil. All subjects answered a questionnaire about the frequency of chimarrão and coffee intake. A multiple regression analysis adjusted for age and sex was performed to assess the association between PD and chimarrão consumption.Results: We included 200 PD patients and 200 healthy controls. High consumption of chimarrão was inversely associated with PD (OR = 0.44, 95% CI = 0.24–0.81, P = 0.008). High consumption of coffee was also inversely associated with PD, as expected. Chimarrão remained associated when adjusted for coffee consumption, smoking history, and age (OR 0.46, 95% CI = 0.25–0.86, P = 0.014). These two exposures showed an additive effect.Conclusion:Chimarrão consumption was inversely associated with PD, even after adjusting for coffee intake, suggesting a possible protective role. IP's effect can be mediated by caffeine and through its antioxidant components. Chimarrão has a lower concentration of caffeine compared with coffee and has numerous substances with antioxidative effects that may be important to PD protection. Further studies are needed to test this hypothesis.

Caffeine is well known for reducing fatigue and its effect on behavior is widely studied. Usually, caffeine is not ingested in its pure form but rather in sugar-sweetened beverages such as cola. Our aim was to compare the acute effect of cola and caffeine on locomotor activity. Rats and flies ingested cola or caffeine solution for 24 hours. The open field test revealed higher locomotor activity in cola groups for both flies and rats. Surprisingly, no differences have been observed between caffeine and control group. We conclude that caffeine itself does not explain the effect of cola on locomotor activity. Effect of cola cannot be generalized and interpreted for any caffeinated drink with other contents. Rather, the observed effect on locomotor activity may be caused by interaction of caffeine with other substances present in cola.

Abstract Background Chronic intake of caffeinated beverages might be associated with plasma lipids via disturbed lipid metabolism. Previous investigations have been limited by the use of self-reported caffeine intake instead of measured caffeine, whereas the associations between plasma lipids and other methylxanthines (paraxanthine, theobromine, theophylline) are unknown. Here, we investigated the associations of plasma lipids with caffeine and its metabolites in plasma and urine in two European populations. Methods Individuals were selected from the general population of North Belgium (FLEMENGHO) and Switzerland (SKIPOGH). Total cholesterol, LDL cholesterol, HDL cholesterol, and triglycerides were measured in plasma using standard enzymatic methods. Plasma and 24h urinary caffeine, paraxanthine, theophylline, and theobromine excretions were measured using ultra-high performance liquid chromatography tandem mass spectrometry. We used mixed models to explore the associations of methylxanthines with plasma lipids while adjusting for major confounders. Results Overall, 1946 FLEMENGHO participants (911 men, age 45.9±15.2 years) and 990 SKIPOGH participants (467 men, age 47.1±17.3 years) were included. Mean plasma total cholesterol, LDL cholesterol, HDL cholesterol, and triglycerides in FLEMENGHO/SKIPOGH were 5.37/5.06, 3.12/3.12, 1.43/1.50, and 2.4/1.02 mmol/L. In both cohorts, adjusted mean total cholesterol, LDL cholesterol, and HDL cholesterol, increased with quartile of plasma caffeine, with stronger associations in men. Similar positive associations were observed for paraxanthine and theophylline. Similar associations were observed using 24h urine excretions in SKIPOGH. Conclusions Plasma and urinary caffeine, paraxanthine, and theophylline were positively associated with plasma lipids in men, whereas there were fewer meaningful associations in women. The increase in plasma lipids might mitigate the overall beneficial impact of caffeinated beverages on health. Key messages Caffeine constitutes one of the most widely consumed biological active substances. Plasma concentration and urinary excretion of caffeine and its derived metabolites is positively associated with plasma lipids.

Introduction: Caffeine is the most widely consumed psychoactive substance in the world and not only found in coffee, but also present in some products includes tea, energy drinks, caffeine containing medicine and soft drink. The aim of conducting the research is to study most popular caffeinated product consumption and its health and behavior alerts among medical students. Methods: A cross sectional study was conducted from beginning of January to the end of March 2020 on branches of medical faculties involved 545 students. Purposive sampling was used to enroll students for this study and they were asked to respond to the validated questionnaires. A questionnaire related to the caffeinated products consumption and related health problems. The analysis included frequency, percentages, mean, standard deviation, unpaired T-test and ANOVA. Result and discussion : The data collected on 545 students found that medical student consumed caffeine in the form of chocolate 87%, coffee 86%, Tea 74.9% soft beverages 67.2% , and Arabic coffee 59.1% ( P= 0.000). Most of the medical student have had some reasons for drinking caffeinated products and these reasons shown significant differences (P< 0.05) and these reasons include 76.5% increase during exam time, about 65% , to a raise level of attention and focus at the lecture and 62% for improve mood .However, students did not aware and expect the negative effect towards caffeine consumption. Based on gender, there was different on the amounts of daily caffeine intake by which male more than female (P< 0.05). Furthermore caffeinated products consumption significant associated with increased body weight (P< 0.05) There also found significant differences of caffeinated products intake among male and female (P< 0.05) by which male more frequent consume. Conclusions: Drinking caffeine containing products by the students were variable from different sources. Although, students were shown consumed caffeine at modest levels. In spite , monitoring is necessary for the daily intake and there is need for educational programs about the health effects related to high consumption of caffeinated products. KEYWORDS: malnutrition, caffeinated, BMI, Behaviors.

Abstract Purpose Previous investigations have found positive effects of acute ingestion of capsules containing 4-to-9 mg of caffeine per kg of body mass on several aspects of judo performance. However, no previous investigation has tested the effectiveness of caffeinated chewing gum as the form of caffeine administration for judoists. The main goal of this study was to assess the effect of acute ingestion of a caffeinated chewing gum on the results of the special judo fitness test (SJFT). Methods Nine male elite judo athletes of the Polish national team (23.7 ± 4.4 years, body mass: 73.5 ± 7.4 kg) participated in a randomized, crossover, placebo-controlled and double-blind experiment. Participants were moderate caffeine consumers (3.1 mg/kg/day). Each athlete performed three identical experimental sessions after: (a) ingestion of two non-caffeinated chewing gums (P + P); (b) a caffeinated chewing gum and a placebo chewing gum (C + P; ~2.7 mg/kg); (c) two caffeinated chewing gums (C + C; ~5.4 mg/kg). Each gum was ingested 15 min before performing two Special Judo Fitness Test (SJFT) which were separated by 4 min of combat activity. Results The total number of throws was not different between P + P, C + P, and C + C (59.66 ± 4.15, 62.22 ± 4.32, 60.22 ± 4.08 throws, respectively; p = 0.41). A two-way repeated measures ANOVA indicated no significant substance × time interaction effect as well as no main effect of caffeine for SJFT performance, SJFT index, blood lactate concentration, heart rate or rating of perceived exertion. Conclusions The results of the current study indicate that the use of caffeinated chewing gum in a dose up to 5.4 mg/kg of caffeine did not increase performance during repeated SJFTs.

Background. Caffeine is the most widespread psychoactive substance in the world. With long-term consumption of caffeinated beverages, there is a high probability of overtaking on caffeine. Objective. The aim of the study was to estimate the consumption of caffeine in the daily caffeine intake of Polish consumers, determine the caffeinated products in the intake of this substance. Materials and methods. The survey was completed by 433 respondents living in Poland. The research tool was the electronic questionnaire, which consisted of: a) questions about personal data and measurement anthropometric and the level of physical activity and smoking; b) questions regarding the portion size and frequency of consumption of coffee, tea, cocoa, chocolate, energy drinks and colacarbonated beverages. Results. The main sources of caffeine in the respondents' diet include: coffee (Me 43.64 mg/d) and tea (Me 37.60 mg/d). Approximately 20% of respondents exceeded the threshold of daily caffeine intake (safety level for children and adolescents up to 3 mg/kg b.w, for adults up to 5.7 mg/kg b.w), considered safe. Conclusions. Respondents who have crossed the safe dose of caffeine intake, should limit the consumption of products being its main source (coffee).

ObjectivesCaffeine is a habit-forming substance consumed daily by the majority of pregnant women. Accordingly, it is important that women receive sound evidence-based advice about potential caffeine-related harm. This narrative review examines evidence of association between maternal caffeine consumption and negative pregnancy outcomes, and assesses whether current health advice concerning maternal caffeine consumption is soundly based.MethodsDatabase searches using terms linking caffeine and caffeinated beverages to pregnancy outcomes identified 1261 English language peer-reviewed articles. Screening yielded a total of 48 original observational studies and meta-analyses of maternal caffeine consumption published in the past two decades. The articles reported results for one or more of six major categories of negative pregnancy outcomes: miscarriage, stillbirth, low birth weight and/or small for gestational age, preterm birth, childhood acute leukaemia, and childhood overweight and obesity.ResultsOf 42 separate sets of findings reported in 37 observational studies, 32 indicated significantly increased caffeine-related risk and 10 suggested no or inconclusive associations. Caffeine-related increased risk was reported with moderate to high levels of consistency for all pregnancy outcomes except preterm birth. Of 11 studies reporting 17 meta-analyses, there was unanimity among 14 analyses in finding maternal caffeine consumption to be associated with increased risk for the four outcome categories of miscarriage, stillbirth, low birth weight and/or small for gestational age, and childhood acute leukaemia. The three remaining meta-analyses were also unanimous in reporting absence of a reliable association between maternal caffeine consumption and preterm birth. No meta-analyses were identified for childhood overweight and obesity, although four of five original observational studies reported significant associations linking maternal caffeine consumption to that outcome category.ConclusionsThe substantial majority finding from observational studies and meta-analyses is that maternal caffeine consumption is reliably associated with major negative pregnancy outcomes. Reported findings were robust to threats from potential confounding and misclassification. Among both observational studies and meta-analyses, there were frequent reports of significant dose–response associations suggestive of causation, and frequent reports of no threshold of consumption below which associations were absent. Consequently, current evidence does not support health advice that assumes 'moderate' caffeine consumption during pregnancy is safe. On the contrary, the cumulative scientific evidence supports pregnant women and women contemplating pregnancy being advised to avoid caffeine.

Introduction This paper offers a survey of familiar popular music performers and songwriters who reference coffee in their work. It examines three areas of discourse: the psychoactive effects of caffeine, coffee and courtship rituals, and the politics of coffee consumption. I claim that coffee carries a cultural and musicological significance comparable to that of the chemical stimulants and consumer goods more readily associated with popular music. Songs about coffee may not be as potent as those featuring drugs and alcohol (Primack; Schapiro), or as common as those referencing commodities like clothes and cars (Englis; McCracken), but they do feature across a wide range of genres, some of which enjoy archetypal associations with this beverage. m.o.m.m.y. Needs c.o.f.f.e.e.: The Psychoactive Effect of Coffee The act of performing and listening to popular music involves psychological elements comparable to the overwhelming sensory experience of drug taking: altered perceptions, repetitive grooves, improvisation, self-expression, and psychological empathy—such as that between musician and audience (Curry). Most popular music genres are, as a result, culturally and sociologically identified with the consumption of at least one mind-altering substance (Lyttle; Primack; Schapiro). While the analysis of lyrics referring to this theme has hitherto focused on illegal drugs and alcoholic beverages (Cooper), coffee and its psychoactive ingredient caffeine have been almost entirely overlooked (Summer). The most recent study of drugs in popular music, for example, defined substance use as “tobacco, alcohol, marijuana, cocaine and other stimulants, heroin and other opiates, hallucinogens, inhalants, prescription drugs, over-the-counter drugs, and nonspecific substances” (Primack 172), thereby ignoring a chemical stimulant consumed by 90 per cent of adult Americans every day (Lovett). The wide availability of coffee and the comparatively mild effect of caffeine means that its consumption rarely causes harm. One researcher has described it as a ubiquitous and unobtrusive “generalised public activity […] ‘invisible’ to analysts seeking distinctive social events” (Cooper 92). Coffee may provide only a relatively mild “buzz”—but it is now accepted that caffeine is an addictive substance (Juliano) and, due to its universal legality, coffee is also the world’s most extensively traded and enthusiastically consumed psychoactive consumer product (Juliano 1). The musical genre of jazz has a longstanding relationship with marijuana and narcotics (Curry; Singer; Tolson; Winick). Unsurprisingly, given its Round Midnight connotations, jazz standards also celebrate the restorative impact of coffee. Exemplary compositions include Burke/Webster’s insomniac torch song Black Coffee, which provided hits for Sarah Vaughan (1949), Ella Fitzgerald (1953), and Peggy Lee (1960); and Frank Sinatra’s recordings of Hilliard/Dick’s The Coffee Song (1946, 1960), which satirised the coffee surplus in Brazil at a time when this nation enjoyed a near monopoly on production. Sinatra joked that this ubiquitous drink was that country’s only means of liquid refreshment, in a refrain that has since become a headline writer’s phrasal template: “There’s an Awful Lot of Coffee in Vietnam,” “An Awful Lot of Coffee in the Bin,” and “There’s an Awful Lot of Taxes in Brazil.” Ethnographer Aaron Fox has shown how country music gives expression to the lived social experience of blue-collar and agrarian workers (Real 29). Coffee’s role in energising working class America (Cooper) is featured in such recordings as Dolly Parton’s Nine To Five (1980), which describes her morning routine using a memorable “kitchen/cup of ambition” rhyme, and Don't Forget the Coffee Billy Joe (1973) by Tom T. Hall which laments the hardship of unemployment, hunger, cold, and lack of healthcare. Country music’s “tired truck driver” is the most enduring blue-collar trope celebrating coffee’s analeptic powers. Versions include Truck Drivin' Man by Buck Owens (1964), host of the country TV show Hee Haw and pioneer of the Bakersfield sound, and Driving My Life Away from pop-country crossover star Eddie Rabbitt (1980). Both feature characteristically gendered stereotypes of male truck drivers pushing on through the night with the help of a truck stop waitress who has fuelled them with caffeine. Johnny Cash’s A Cup of Coffee (1966), recorded at the nadir of his addiction to pills and alcohol, has an incoherent improvised lyric on this subject; while Jerry Reed even prescribed amphetamines to keep drivers awake in Caffein [sic], Nicotine, Benzedrine (And Wish Me Luck) (1980). Doye O’Dell’s Diesel Smoke, Dangerous Curves (1952) is the archetypal “truck drivin’ country” song and the most exciting track of its type. It subsequently became a hit for the doyen of the subgenre, Red Simpson (1966). An exhausted driver, having spent the night with a woman whose name he cannot now recall, is fighting fatigue and wrestling his hot-rod low-loader around hairpin mountain curves in an attempt to rendezvous with a pretty truck stop waitress. The song’s palpable energy comes from its frenetic guitar picking and the danger implicit in trailing a heavy load downhill while falling asleep at the wheel. Tommy Faile’s Phantom 309, a hit for Red Sovine (1967) that was later covered by Tom Waits (Big Joe and the Phantom 309, 1975), elevates the “tired truck driver” narrative to gothic literary form. Reflecting country music’s moral code of citizenship and its culture of performative storytelling (Fox, Real 23), it tells of a drenched and exhausted young hitchhiker picked up by Big Joe—the driver of a handsome eighteen-wheeler. On arriving at a truck stop, Joe drops the traveller off, giving him money for a restorative coffee. The diner falls silent as the hitchhiker orders up his “cup of mud”. Big Joe, it transpires, is a phantom trucker. After running off the road to avoid a school bus, his distinctive ghost rig now only reappears to rescue stranded travellers. Punk rock, a genre closely associated with recreational amphetamines (McNeil 76, 87), also features a number of caffeine-as-stimulant songs. Californian punk band, Descendents, identified caffeine as their drug of choice in two 1996 releases, Coffee Mug and Kids on Coffee. These songs describe chugging the drink with much the same relish and energy that others might pull at the neck of a beer bottle, and vividly compare the effects of the drug to the intense rush of speed. The host of “New Music News” (a segment of MTV’s 120 Minutes) references this correlation in 1986 while introducing the band’s video—in which they literally bounce off the walls: “You know, while everybody is cracking down on crack, what about that most respectable of toxic substances or stimulants, the good old cup of coffee? That is the preferred high, actually, of California’s own Descendents—it is also the subject of their brand new video” (“New Music News”). Descendents’s Sessions EP (1997) featured an overflowing cup of coffee on the sleeve, while punk’s caffeine-as-amphetamine trope is also promulgated by Hellbender (Caffeinated 1996), Lagwagon (Mr. Coffee 1997), and Regatta 69 (Addicted to Coffee 2005). Coffee in the Morning and Kisses in the Night: Coffee and Courtship Coffee as romantic metaphor in song corroborates the findings of early researchers who examined courtship rituals in popular music. Donald Horton’s 1957 study found that hit songs codified the socially constructed self-image and limited life expectations of young people during the 1950s by depicting conservative, idealised, and traditional relationship scenarios. He summarised these as initial courtship, honeymoon period, uncertainty, and parting (570-4). Eleven years after this landmark analysis, James Carey replicated Horton’s method. His results revealed that pop lyrics had become more realistic and less bound by convention during the 1960s. They incorporated a wider variety of discourse including the temporariness of romantic commitment, the importance of individual autonomy in relationships, more liberal attitudes, and increasingly unconventional courtship behaviours (725). Socially conservative coffee songs include Coffee in the Morning and Kisses in the Night by The Boswell Sisters (1933) in which the protagonist swears fidelity to her partner on condition that this desire is expressed strictly in the appropriate social context of marriage. It encapsulates the restrictions Horton identified on courtship discourse in popular song prior to the arrival of rock and roll. The Henderson/DeSylva/Brown composition You're the Cream in My Coffee, recorded by Annette Hanshaw (1928) and by Nat King Cole (1946), also celebrates the social ideal of monogamous devotion. The persistence of such idealised traditional themes continued into the 1960s. American pop singer Don Cherry had a hit with Then You Can Tell Me Goodbye (1962) that used coffee as a metaphor for undying and everlasting love. Otis Redding’s version of Butler/Thomas/Walker’s Cigarettes and Coffee (1966)—arguably soul music’s exemplary romantic coffee song—carries a similar message as a couple proclaim their devotion in a late night conversation over coffee. Like much of the Stax catalogue, Cigarettes and Coffee, has a distinctly “down home” feel and timbre. The lovers are simply content with each other; they don’t need “cream” or “sugar.” Horton found 1950s blues and R&B lyrics much more sexually explicit than pop songs (567). Dawson (1994) subsequently characterised black popular music as a distinct public sphere, and Squires (2002) argued that it displayed elements of what she defined as “enclave” and “counterpublic” traits. Lawson (2010) has argued that marginalised and/or subversive blues artists offered a form of countercultural resistance against prevailing social norms. Indeed, several blues and R&B coffee songs disregard established courtship ideals and associate the product with non-normative and even transgressive relationship circumstances—including infidelity, divorce, and domestic violence. Lightnin’ Hopkins’s Coffee Blues (1950) references child neglect and spousal abuse, while the narrative of Muddy Waters’s scorching Iodine in my Coffee (1952) tells of an attempted poisoning by his Waters’s partner. In 40 Cups of Coffee (1953) Ella Mae Morse is waiting for her husband to return home, fuelling her anger and anxiety with caffeine. This song does eventually comply with traditional courtship ideals: when her lover eventually returns home at five in the morning, he is greeted with a relieved kiss. In Keep That Coffee Hot (1955), Scatman Crothers supplies a counterpoint to Morse’s late-night-abandonment narrative, asking his partner to keep his favourite drink warm during his adulterous absence. Brook Benton’s Another Cup of Coffee (1964) expresses acute feelings of regret and loneliness after a failed relationship. More obliquely, in Coffee Blues (1966) Mississippi John Hurt sings affectionately about his favourite brand, a “lovin’ spoonful” of Maxwell House. In this, he bequeathed the moniker of folk-rock band The Lovin’ Spoonful, whose hits included Do You Believe in Magic (1965) and Summer in the City (1966). However, an alternative reading of Hurt’s lyric suggests that this particular phrase is a metaphorical device proclaiming the author’s sexual potency. Hurt’s “lovin’ spoonful” may actually be a portion of his seminal emission. In the 1950s, Horton identified country as particularly “doleful” (570), and coffee provides a common metaphor for failed romance in a genre dominated by “metanarratives of loss and desire” (Fox, Jukebox 54). Claude Gray’s I'll Have Another Cup of Coffee (Then I’ll Go) (1961) tells of a protagonist delivering child support payments according to his divorce lawyer’s instructions. The couple share late night coffee as their children sleep through the conversation. This song was subsequently recorded by seventeen-year-old Bob Marley (One Cup of Coffee, 1962) under the pseudonym Bobby Martell, a decade prior to his breakthrough as an international reggae star. Marley’s youngest son Damian has also performed the track while, interestingly in the context of this discussion, his older sibling Rohan co-founded Marley Coffee, an organic farm in the Jamaican Blue Mountains. Following Carey’s demonstration of mainstream pop’s increasingly realistic depiction of courtship behaviours during the 1960s, songwriters continued to draw on coffee as a metaphor for failed romance. In Carly Simon’s You’re So Vain (1972), she dreams of clouds in her coffee while contemplating an ostentatious ex-lover. Squeeze’s Black Coffee In Bed (1982) uses a coffee stain metaphor to describe the end of what appears to be yet another dead-end relationship for the protagonist. Sarah Harmer’s Coffee Stain (1998) expands on this device by reworking the familiar “lipstick on your collar” trope, while Sexsmith & Kerr’s duet Raindrops in my Coffee (2005) superimposes teardrops in coffee and raindrops on the pavement with compelling effect. Kate Bush’s Coffee Homeground (1978) provides the most extreme narrative of relationship breakdown: the true story of Cora Henrietta Crippin’s poisoning. Researchers who replicated Horton’s and Carey’s methodology in the late 1970s (Bridges; Denisoff) were surprised to find their results dominated by traditional courtship ideals. The new liberal values unearthed by Carey in the late 1960s simply failed to materialise in subsequent decades. In this context, it is interesting to observe how romantic coffee songs in contemporary soul and jazz continue to disavow the post-1960s trend towards realistic social narratives, adopting instead a conspicuously consumerist outlook accompanied by smooth musical timbres. This phenomenon possibly betrays the influence of contemporary coffee advertising. From the 1980s, television commercials have sought to establish coffee as a desirable high end product, enjoyed by bohemian lovers in a conspicuously up-market environment (Werder). All Saints’s Black Coffee (2000) and Lebrado’s Coffee (2006) identify strongly with the culture industry’s image of coffee as a luxurious beverage whose consumption signifies prominent social status. All Saints’s promotional video is set in a opulent location (although its visuals emphasise the lyric’s romantic disharmony), while Natalie Cole’s Coffee Time (2008) might have been itself written as a commercial. Busting Up a Starbucks: The Politics of Coffee Politics and coffee meet most palpably at the coffee shop. This conjunction has a well-documented history beginning with the establishment of coffee houses in Europe and the birth of the public sphere (Habermas; Love; Pincus). The first popular songs to reference coffee shops include Jaybird Coleman’s Coffee Grinder Blues (1930), which boasts of skills that precede the contemporary notion of a barista by four decades; and Let's Have Another Cup of Coffee (1932) from Irving Berlin’s depression-era musical Face The Music, where the protagonists decide to stay in a restaurant drinking coffee and eating pie until the economy improves. Coffee in a Cardboard Cup (1971) from the Broadway musical 70 Girls 70 is an unambiguous condemnation of consumerism, however, it was written, recorded and produced a generation before Starbucks’ aggressive expansion and rapid dominance of the coffee house market during the 1990s. The growth of this company caused significant criticism and protest against what seemed to be a ruthless homogenising force that sought to overwhelm local competition (Holt; Thomson). In response, Starbucks has sought to be defined as a more responsive and interactive brand that encourages “glocalisation” (de Larios; Thompson). Koller, however, has characterised glocalisation as the manipulative fabrication of an “imagined community”—whose heterogeneity is in fact maintained by the aesthetics and purchasing choices of consumers who make distinctive and conscious anti-brand statements (114). Neat Capitalism is a more useful concept here, one that intercedes between corporate ideology and postmodern cultural logic, where such notions as community relations and customer satisfaction are deliberately and perhaps somewhat cynically conflated with the goal of profit maximisation (Rojek). As the world’s largest chain of coffee houses with over 19,400 stores in March 2012 (Loxcel), Starbucks is an exemplar of this phenomenon. Their apparent commitment to environmental stewardship, community relations, and ethical sourcing is outlined in the company’s annual “Global Responsibility Report” (Vimac). It is also demonstrated in their engagement with charitable and environmental non-governmental organisations such as Fairtrade and Co-operative for Assistance and Relief Everywhere (CARE). By emphasising this, Starbucks are able to interpellate (that is, “call forth”, “summon”, or “hail” in Althusserian terms) those consumers who value environmental protection, social justice and ethical business practices (Rojek 117). Bob Dylan and Sheryl Crow provide interesting case studies of the persuasive cultural influence evoked by Neat Capitalism. Dylan’s 1962 song Talkin’ New York satirised his formative experiences as an impoverished performer in Greenwich Village’s coffee houses. In 1995, however, his decision to distribute the Bob Dylan: Live At The Gaslight 1962 CD exclusively via Starbucks generated significant media controversy. Prominent commentators expressed their disapproval (Wilson Harris) and HMV Canada withdrew Dylan’s product from their shelves (Lynskey). Despite this, the success of this and other projects resulted in the launch of Starbucks’s in-house record company, Hear Music, which released entirely new recordings from major artists such as Ray Charles, Paul McCartney, Joni Mitchell, Carly Simon and Elvis Costello—although the company has recently announced a restructuring of their involvement in this venture (O’Neil). Sheryl Crow disparaged her former life as a waitress in Coffee Shop (1995), a song recorded for her second album. “Yes, I was a waitress. I was a waitress not so long ago; then I won a Grammy” she affirmed in a YouTube clip of a live performance from the same year. More recently, however, Crow has become an avowed self-proclaimed “Starbucks groupie” (Tickle), releasing an Artist’s Choice (2003) compilation album exclusively via Hear Music and performing at the company’s 2010 Annual Shareholders’s Meeting. Songs voicing more unequivocal dissatisfaction with Starbucks’s particular variant of Neat Capitalism include Busting Up a Starbucks (Mike Doughty, 2005), and Starbucks Takes All My Money (KJ-52, 2008). The most successful of these is undoubtedly Ron Sexsmith’s Jazz at the Bookstore (2006). Sexsmith bemoans the irony of intense original blues artists such as Leadbelly being drowned out by the cacophony of coffee grinding machines while customers queue up to purchase expensive coffees whose names they can’t pronounce. In this, he juxtaposes the progressive patina of corporate culture against the circumstances of African-American labour conditions in the deep South, the shocking incongruity of which eventually cause the old bluesman to turn in his grave. Fredric Jameson may have good reason to lament the depthless a-historical pastiche of postmodern popular culture, but this is no “nostalgia film”: Sexsmith articulates an artfully framed set of subtle, sensitive, and carefully contextualised observations. Songs about coffee also intersect with politics via lyrics that play on the mid-brown colour of the beverage, by employing it as a metaphor for the sociological meta-narratives of acculturation and assimilation. First popularised in Israel Zangwill’s 1905 stage play, The Melting Pot, this term is more commonly associated with Americanisation rather than miscegenation in the United States—a nuanced distinction that British band Blue Mink failed to grasp with their memorable invocation of “coffee-coloured people” in Melting Pot (1969). Re-titled in the US as People Are Together (Mickey Murray, 1970) the song was considered too extreme for mainstream radio airplay (Thompson). Ike and Tina Turner’s Black Coffee (1972) provided a more accomplished articulation of coffee as a signifier of racial identity; first by associating it with the history of slavery and the post-Civil Rights discourse of African-American autonomy, then by celebrating its role as an energising force for African-American workers seeking economic self-determination. Anyone familiar with the re-casting of black popular music in an industry dominated by Caucasian interests and aesthetics (Cashmore; Garofalo) will be unsurprised to find British super-group Humble Pie’s (1973) version of this song more recognisable. Conclusion Coffee-flavoured popular songs celebrate the stimulant effects of caffeine, provide metaphors for courtship rituals, and offer critiques of Neat Capitalism. Harold Love and Guthrie Ramsey have each argued (from different perspectives) that the cultural micro-narratives of small social groups allow us to identify important “ethnographic truths” (Ramsey 22). Aesthetically satisfying and intellectually stimulating coffee songs are found where these micro-narratives intersect with the ethnographic truths of coffee culture. 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