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Introduction and objectives: Studies assessing the effects of caffeine (CAF) on the cardiovascular system have demonstrated that CAF can delay cardiac recovery following exercise. This study intended to assess the impact of CAF intake before physical exercise on heart rate variability (HRV) and cardiovascular parameters. Methods: This is a prospective, crossover, controlled clinical trial conducted at the University of Pernambuco, Petrolina, PE, Brazil. The experimental protocol was split into three stages with a minimum of 48 hours between them. Exercises intensity was standardized based on the one repetition maximum test (1RM), obtaining the load of each volunteer for the intensity of 75% of 1RM. In the second and third phases, the control protocols were applied and 300 mg caffeine was given 45 minutes before training. HRV indices were determined at the subsequent times: 0 to 5 minutes of rest (before) and during 30 minutes of recovery (Rec) (after exercise), divided into six intervals, each of 5 minutes. Results: The final sample involved 30 volunteers. CAF delayed HRV recovery after resistance exercise. In general, CAF impaired recovery of HRV after resistance exercise. Significant changes were observed in the RMSSD, SDNN, TINN, SD1, low frequency and high frequency indices between the control and CAF group. Conclusion: CAF protocol delayed parasympathetic regulation of heart rhythm following exercise, slowing recovery of HR, blood pressure and HRV indices after exercise. Resumo: Introdução e objetivos: Estudos avaliando os efeitos da cafeína (CAF) sobre o sistema cardiovascular mostraram que a CAF pode retardar a recuperação dos batimentos cardíacos ao estado de repouso após o exercício. Este estudo teve como objetivo avaliar o impacto da ingestão de cafeína (CAF) antes do exercício físico de força sobre variabilidade da frequência cardíaca (VFC) na recuperação. Metodologia: Trata-se de um ensaio clínico prospetivo, controlado por cruzamento, realizado na Universidade de Pernambuco, em Petrolina, PE. Está registrado no ClinicalTrials.gov (Number NCT03899675). O procedimento experimental foi dividido em três etapas com um mínimo de 48 horas entre elas. A intensidade do exercício foi padronizada com base no teste de 1 repetição máxima (1RM), obtendo-se a carga de cada voluntário para a intensidade de 75% de 1RM. Na segunda e terceira fase da pesquisa, os protocolos de controle e cafeína (300 mg) foram aplicados. A ingestão de cafeína aconteceu 45 minutos antes do treinamento. Os índices de VFC foram determinados nos seguintes tempos: 0 a 5 minutos de repouso (antes) e durante 30 minutos de recuperação (Rec) (após o exercício), divididos em seis intervalos de 5 minutos cada. Resultados: A amostra final foi composta por 30 voluntários. No geral, a cafeína prejudicou a recuperação da VFC no período de recuperação após o exercício resistido. Diferenças significativas foram observadas nos índices RMSSD, SDNN, TINN, SD1, LF e HF entre o grupo controle e o grupo CAF. Conclusão: O protocolo CAF foi capaz de intensificar reduções na atividade parassimpática após o exercício, causando atraso na recuperação da FC, pressão arterial e índices de VFC após o exercício.

Objetivo: Avaliar o nível de conhecimento, hábitos, e prevalência de consumo de energéticos e suplementos à base de cafeína por praticantes de exercícios físicos em academias. Métodos: Foi empregado um questionário autoaplicável de 27 perguntas no Google® Forms, divulgado em mídias sociais entre setembro e outubro de 2018. Resultados: Participaram 200 frequentadores de academias, 71% adultos jovens, 52% tendo mais de 2 anos de prática e frequência regular de 5 - 6 vezes por semana. A maioria da amostra era mulher (58,5%), praticante de musculação (61,6%) de MG (62,5%). O consumo sem orientação profissional foi de 81,6% nos energéticos e 53,9%para suplementos à base de cafeína. 73,3% dos consumidores de energéticos tinham objetivos relacionados com atividades sociais, preferindo a marca RedBul®(40,4%). Entre os consumidores de suplementos de cafeína houve preferência por termogênicos (32,7%) e cafeína pura (29,9%), com objetivo principal a melhora de performance (28,7%), apresentando respostas ergolíticas de taquicardia e palpitações como registrado nos energéticos. Não houve registro de efeitos adversos em 19,2% dos consumidores de cafeína e 40,8% de energéticos. As dosagens de consumo dos produtos estavam dentro da faixa de segurança (< 6 mg/kg).Conclusão: O consumo de ambos produtos foi feito sem orientação profissional, porém, com dosagens dentro da faixa de segurança. O consumo de bebidas energéticas esteve voltado para atividades sociais e melhora da performance esportiva. Foram registrados efeitos ergolíticos. Objective:Evaluate the level of knowledge, habits, and prevalence of consumption of energy drinks and supplements based on caffeine by practitioners of physical exercises in gyms. Methods: A self-administered questionnaire of 27 topics was used on Google® Forms, published on social media between September and October 2018. Results: 200 gym goers participated, 71% young adults, 52% having more than two years of practice, and attendance regular 5 - 6 times a week. Most were women (58.5%), bodybuilders (61.6%), and from Minas Gerais State (62.5%). Consumption without professional guidance was 81.6% for energy drinks and 53.9% for caffeine-based supplements. Most energy consumers (73.3%) had goals related to social activities, preferring the RedBul® brand (40.4%). Among consumers of caffeine supplements, there was a preference for thermogenic (32.7%) and pure caffeine (29.9%), with the primary objective of improving performance (28.7%), presenting ergolytic responses of tachycardia and palpitations as recorded in energy drinks. There was no record of adverse effects in 19.2% of caffeine consumers and 40.8% of energy drinkers. The consumption dosages of the products were within the safety range (< 6 mg/kg). Conclusion: The consumption of both products was made without professional guidance, however, with dosages within the safety range. The consumption of energy drinks aimed at social activities and improved sports performance. Ergolytic effects have been reported.

Objective: To describe electrocorticographic, electromyographic and electrocardiographic profiles to report the electrophysiological effects of caffeine in Wistar rats. Methods: Male adult Wistar rats weighing 230g to 250g were used. Rats were allocated to one of two groups, as follows: Group 1, Control, intraperitoneal injection of 0.9% saline solution (n=27); and Group 2, treated with intraperitoneal injection of caffeine (50mg/kg; n=27). The rats were submitted to electrocorticographic, electromyographic and electrocardiographic assessment. Results: Brain oscillations (delta, theta, alpha, beta and gamma) in the frequency range up to 40Hz varied after caffeine administration to rats. Powers in delta and theta oscillations ranges were preponderant. The contractile force of the skeletal striated and cardiac muscles increased. Electrocardiogram analysis revealed shorter RR, QRS and QT intervals under the effect of caffeine. Conclusion: In the central nervous system, there was an increase in the delta, theta and alpha amplitude spectrum, which are related to memory encoding and enhanced learning. With regard to skeletal muscle, increased contraction of the gastrocnemius muscle was demonstrated, a clear indication of how caffeine can be used to enhance performance of some physical activities. Electrocardiographic changes observed after caffeine administration are primarily related to increased heart rate and energy consumption. RESUMO Objetivo: Descrever os perfis eletrocorticográficos, eletromiográficos e eletrocardiográficos para relatar os efeitos eletrofisiológicos da cafeína em ratos Wistar. Métodos: Foram utilizados ratos Wistar, machos, adultos, pesando de 230g a 250g. Os animais foram divididos nos seguintes grupos: Grupo 1, Controle com solução fisiológica 0,9% por via intraperitoneal (n=27), e Grupo 2, Tratado com Cafeína (50mg/kg intraperitoneal; n=27). Foram realizadas avaliações por eletrocorticograma, eletromiograma e eletrocardiograma. Resultados: Houve variações nas oscilações cerebrais (delta, teta, alfa, beta e gama) na faixa de frequência de até 40Hz após a aplicação de cafeína em ratos. Observou-se que as potências nas faixas das oscilações delta e teta foram preponderantes. A força de contração nos músculos estriado esquelético e cardíaco aumentou. A avaliação do eletrocardiograma demonstrou que a duração dos intervalos RR, QRS e QT foram menores na presença da cafeína. Conclusão: No sistema nervoso central, houve aumento dos espectros de amplitude delta, teta e alfa, que auxiliam na codificação das memórias e estão relacionados à melhora do aprendizado. Em relação à musculatura esquelética, demonstrou-se aumento da contração do músculo gastrocnêmio, uma clara indicação de como a cafeína pode ser usada para aumentar o desempenho em algumas atividades físicas. As alterações eletrocardiográficas observadas após a administração de cafeína estiveram relacionadas principalmente ao aumento da frequência cardíaca e do consumo de energia.

We thank all the volunteers for the participation and personnel for the contribution in the PREDIMED-Plus trial. CIBEROBN, CIBERESP and CIBERDEM are initiatives of ISCIII, Madrid, Spain. The authors also thank the PREDIMED-Plus Biobank Network as a part of the National Biobank Platform of the ISCIII for storing and managing the PREDIMED-Plus biological samples. This work was supported by the official Spanish Institutions for funding scientific biomedical research, CIBER Fisiopatologia de la Obesidad y Nutricion (CIBEROBN) and Instituto de Salud Carlos III (ISCIII), through the Fondo de Investigacion para la Salud (FIS), which is co-funded by the European Regional Development Fund (five coordinated FIS projects leaded by JS-S and JVi, including the following projects: PI13/00673, PI13/00492, PI13/00272, PI13/01123, PI13/00462, PI13/00233, PI13/02184, PI13/00728, PI13/01090, PI13/01056, PI14/01722, PI14/00636, PI14/00618, PI14/00696, PI14/01206, PI14/01919, PI14/00853, PI14/01374, PI14/00972, PI14/00728, PI14/01471, PI16/00473, PI16/00662, PI16/01873, PI16/01094, PI16/00501, PI16/00533, PI16/00381, PI16/00366, PI16/01522, PI16/01120, PI17/00764, PI17/01183, PI17/00855, PI17/01347, PI17/00525, PI17/01827, PI17/00532, PI17/00215, PI17/01441, PI17/00508, PI17/01732, PI17/00926, PI19/00957, PI19/00386, PI19/00309, PI19/01032, PI19/00576, PI19/00017, PI19/01226, PI19/00781, PI19/01560, PI19/01332, PI20/01802, PI20/00138, PI20/01532, PI20/00456, PI20/00339, PI20/00557, PI20/00886, PI20/01158); the Especial Action Project entitled: Implementacion y evaluacion de una intervencion intensiva sobre la actividad fisica Cohorte PREDIMED-Plus Grant to JS-S; the European Research Council (Advanced Research Grant 2014-2019; Agreement #340918) granted to MaM-G.; the Recercaixa (Number 2013ACUP00194) grant to JS-S; grants from the Consejeria de Salud de la Junta de Andalucia (PI0458/2013, PS0358/2016, PI0137/2018); the PROMETEO/2017/017 grant from the Generalitat Valenciana; the SEMERGEN grant; funds from the European Regional Development Fund (CB06/03); International Nut & Dried Fruit Council - FESNAD (Long-term effects of an energy-restricted Mediterranean diet on mortality and cardiovascular disease 2014 -2015, No. 201302) (PI: MaM-G); the AstraZeneca Young Investigators Award in Category of Obesity and T2D 2017 (PI: DR); grant of support to research groups no. 35/2011 (Balearic Islands Gov.; FEDER funds) (JAT and CB); the JR17/00022 (ISCIII) grant to OC; the Boosting young talent call grant program for the development of IISPV research projects 2019-2021 (Ref.: 2019/IISPV/03 grant to AD-L); the Societat Catalana d'Endocrinologia i Nutricio (SCEN) Clinical-Research Grant 2019 (IPs: JS-S and AD-L). Collaborative Nutrition and/or Obesity Project for Young Researchers 2019 supported by CIBEROBN entitled: Lifestyle Interventions and Chronic Kidney Disease: Inflammation, Oxidative Stress and Metabolomic Profile (LIKIDI study) grant to AD-L. IP-G receives a grant from the Spanish Ministry of Education, Culture and Sports (FPU17/01925). Jordi Salas-Salvado, the senior author of this work, gratefully acknowledges the financial support by ICREA under the ICREA Academia programme. None of the funding sources took part in the design, collection, analysis, interpretation of the data, or writing the report, or in the decision to submit the manuscript for publication., It remains unclear whether caffeinated beverages could have deleterious renal effects in elderly population with underlying comorbid conditions. We investigated the associations between coffee, tea, or caffeine intake and 1-year changes in glomerular filtration rate (eGFR) in a large Spanish cohort of overweight/obese elderly with metabolic syndrome (MetS). This prospective analysis includes 5851 overweight/obese adults (55-75 years) with MetS from the PREDIMED-Plus study. We assessed coffee, tea, and caffeine consumption from a validated food-frequency questionnaire and creatinine-based eGFR using the Chronic Kidney Disease Epidemiology Collaboration equation. Multivariate-adjusted regression models were applied to test associations between baseline coffee, tea, or caffeine intake and 1-year eGFR changes. Caffeinated coffee (> 2 cups/day) and tea (at least 1 cup/day) drinkers had 0.88 and 0.93 mL/min/1.73 m(2) greater eGFR decrease respectively, compared to those with less than 1 cup/day of coffee consumption or non-tea drinkers. Furthermore, caffeinated coffee consumption of > 2 cups/day was associated with 1.19-fold increased risk of rapid eGFR decline > 3 mL/min/1.73 m(2) (95% CI 1.01-1.41). Similarly, individuals in the highest (median, 51.2 mg/day) tertile of caffeine intake had a 0.87 mL/min/1.73 m(2) greater eGFR decrease. Decaffeinated coffee was not associated with eGFR changes. In conclusion, higher consumption of caffeinated coffee, tea, and caffeine was associated with a greater 1-year eGFR decline in overweight/obese adults with MetS., CIBER Fisiopatologia de la Obesidad y Nutricion (CIBEROBN), Instituto de Salud Carlos III (ISCIII), through the Fondo de Investigacion para la Salud (FIS) - European Regional Development Fund PI13/00673 PI13/00492 PI13/00272 PI13/01123 PI13/00462 PI13/00233 PI13/02184 PI13/00728 PI13/01090 PI13/01056 PI14/01722 PI14/00636 PI14/00618 PI14/00696 PI14/01206 PI14/01919 PI14/00853 PI14/01374 PI14/00972 PI14/00728 PI14/01471 PI16/00473, European Research Council (ERC) European Commission 340918, La Caixa Foundation 2013ACUP00194, Junta de Andalucia PI0458/2013 PS0358/2016 PI0137/2018, Generalitat Valenciana European Commission PROMETEO/2017/017, European Commission CB06/03, International Nut & Dried Fruit Council - FESNAD (Long-term effects of an energy-restricted Mediterranean diet on mortality and cardiovascular disease 2014 -2015) 201302, SEMERGEN grant, AstraZeneca, Balearic Islands Gov.; FEDER funds 35/2011, (ISCIII) grant JR17/00022, Boosting young talent call grant program for the development of IISPV research projects 2019-2021 2019/IISPV/03, Societat Catalana d'Endocrinologia i Nutricio (SCEN) Clinical-Research Grant 2019, Collaborative Nutrition and/or Obesity Project for Young Researchers 2019 - CIBEROBN, Spanish Ministry of Education, Culture and Sports FPU17/01925, ICREA, the Instituto de Salud Carlos III (ISCIII), through the Fondo de Investigacion para la Salud (FIS) - European Regional Development Fund PI17/01441 PI17/00508 PI17/01732 PI17/00926 PI19/00957 PI19/00386 PI19/00309 PI19/01032 PI19/00576 PI19/00017 PI19/01226 PI19/00781 PI19/01560 PI19/01332 PI20/01802 PI20/00138 PI20/01532 PI20/00456 PI20/00339 PI20/00557 PI20/00886 PI20/01158, 'Instituto de Salud Carlos III (ISCIII), through the Fondo de Investigacion para la Salud (FIS) - European Regional Development Fund' PI16/00662 PI16/01873 PI16/01094 PI16/00501 PI16/00533 PI16/00381 PI16/00366 PI16/01522 PI16/01120 PI17/00764 PI17/01183 PI17/00855 PI17/01347 PI17/00525 PI17/01827 PI17/00532 PI17/00215

Caffeine has been widely used to treat gynoid lipodystrophy (GLD). Despite caffeine has been considered as a promise treatment, there is a lack of scientific evidences regarding its effect on GLD when associated with iontophoresis or others equipment. We aimed to evaluate the effects of a caffeine gel alone and associated with iontophoresis in GLD treatment. In a single-blind randomized clinical trial, women with mild/moderate GLD in the buttocks were randomized to topical caffeine gel group (CG; n=10); caffeine gel plus iontophoresis group (CIG; n=11) or iontophoresis group (IG; n=10). The groups were treated with 10 sessions, two times/week, 20 min/session. The subjects were evaluated pre and post treatment by photonumeric GLD severity scale, ultrasound image, thermography and quality of life questionnaire with a blind evaluator. There were statistical reduction in subcutaneous tissue thickness (P≤0.046) as well as in subcutaneous tissue plus dermis thickness (P≤0.044) in buttocks both in CG and CIG. GLD reduction was similar between CG and CIG, and these reductions were more pronounced than in IG (P

The main movements of artistic swimming demand various physical capacities such as flexibility, strength, power, and muscular endurance. The use of ergogenic resources to potentialize performance in this sport, however, is underexplored and deserves investigation. In the present study, we tested whether caffeine ingestion would improve the execution of movements that are essential in a typical figure competition or routines in artistic swimming (i.e., amplitude in the Ariana, height in the Boost and Barracuda, and time maintained in the Stationary Scull techniques). Sixteen experienced female athlete artistic swimmers (17.4±3.2 years of age, 5.6±2.8 years of artistic swimming practice) performed several movements of artistic swimming after having ingested a capsule containing caffeine (5 mg/kg body mass) or cellulose (placebo). Compared to the placebo, caffeine improved latero-lateral amplitude during the Ariana (P=0.035), the height of the Boost and Barracuda (P=0.028 and 0.009), and maintained duration in Stationary Sculling (P=0.012). Bayes factor analysis, however, indicated substantial evidence of a positive effect of caffeine only on the Barracuda and Stationary Scull techniques. These findings indicated that caffeine improved performance during specific artistic swimming movements. Coaches and athletes should consider caffeine ingestion in their supplementation plans.

Sedentary time is associated with increased obesity in police officers. Caffeine intake may reduce sedentary time but it has not been extensively investigated. In the present study, the effect of caffeine ingestion on sedentary time was investigated in obese police officers. Fourteen obese police officers ingested either 5 mg/kg of caffeine or cellulose (placebo) for six days. Information on inactivity time, time spent with physical activities, self-reported perception of tiredness, and physical activity disposition was obtained daily during the intervention period. Sedentary and physical activity times were divided into two intraday periods (T1: 08:00 am-02:00 pm and T2: 02:00 pm-08:00 pm). Caffeine intake decreased the sedentary time in both T1 (79.2±2.2%) and T2 (79.1±2.5%), when compared with T2 of the placebo condition (81.1±3.6%, P0.05), but it increased the self-reported physical activity disposition compared to the placebo condition (4.5±2.7 vs 3.2±2.3 units, P

Made available in DSpace on 2021-06-25T12:39:18Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-04-01. Added 1 bitstream(s) on 2021-07-15T15:06:17Z : No. of bitstreams: 1 S0103-50532021000400800.pdf: 5035489 bytes, checksum: 680db78654a402895ccf02f459e91309 (MD5) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Illicit drugs and their trafficking require worldwide efforts in investigation, detection, and control. Colorimetric tests are often applied to identify drugs. Cocaine has some well-known adulterants that can provide a false positive response. Cucurbit[6]uril (CB[6]) has been suggested as a potential detector for cocaine and other illicit drugs. This work uses in silico methods to evaluate the use of CB[6] to detect cocaine and these interfering substances. More specifically, this work analyzes different possibilities of CB[6] complexation with cocaine, lidocaine, caffeine, and procaine and compares the results achieved for cocaine and its adulterants. Different methodologies were employed: quantum chemistry was investigated through DFT B3LYP/TZVP (density functional theory-Becke, three-parameter, Lee-Yang-Parr with triple zeta valence plus polarization basis set) and the semi-empirical methods Austin model 1 (AM1), parametric methods 3, 6, and 7 (PM3, PM6, PM7), and Recife model 1 (RM1). We used these methodologies intending to compare the reasonability and reproducibility of the results in the gas phase condition. Solvent influence was studied by molecular dynamics (MD) simulations. Results showed that CB[6] does not bind to these substances, as judged from the positive values of binding free energy obtained with all methods. DFT and MD were the most reliable methods whereas semiempirical ones were not reproductible in describing these systems. Results also showed that interactions are not specific, so CB[6] does not provide a good response for cocaine detection. Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Quim, Ave Bandeirantes 3900, BR-14040901 Ribeirao Preto, SP, Brazil Inst Nacl Ciencia & Tecnol Forense INCT Forense, Ave Bandeirantes 3900, BR-14040901 Ribeirao Preto, SP, Brazil Univ Estadual Paulista, Inst Biociencias Letras & Ciencias Exatas, Dept Fis, Rua Cristovao Colombo 2265, BR-15054000 Sao Jose Do Rio Preto, SP, Brazil Univ Estadual Paulista, Inst Biociencias Letras & Ciencias Exatas, Dept Fis, Rua Cristovao Colombo 2265, BR-15054000 Sao Jose Do Rio Preto, SP, Brazil CNPq: 465450/2014-8 FAPESP: 2016/19766-1 FAPESP: 2016/24587-9 CAPES: 001

Low-grade chronic inflammation is associated with many chronic diseases and pathological conditions. The aim of the present study was to determine the effect of regular caffeine intake, physical activity levels, and sedentary behavior on the inflammatory status in healthy participants. In total, 112 men and 132 women aged 18 to 55 years and belonging to the staff and student population of the University of the Balearic Islands volunteered to participate in this descriptive cross-sectional study. Plasma concentrations of pro-inflammatory and anti-inflammatory markers were measured. Weight, height, and body composition (bioelectrical impedance) were determined. Caffeine intake, physical activity levels and sitting time, and diet quality were determined using questionnaires. Statistical regression analysis showed that caffeine intake was a negative predictor of C-reactive protein (CRP) (p = 0.001). Body fat percentage was positively associated with CRP (p &lt, 0.001) and inversely associated with adiponectin (p = 0.032) and interleukin (IL)-10 levels (p = 0.001). Visceral fat was the main predictor for IL-6 (p &lt, 0.001) and tumor necrosis factor (TNF)-&alpha, (p &lt, 0.001). Sitting time was found to be the main, inverse, predictor for IL-10 (p &lt, 0.001), and a positive predictor for TNF-&alpha, 0.001). In conclusion, regular caffeine consumption induced very limited anti-inflammatory effects. Sedentary behavior and body fat accumulation induced significant pro-inflammatory effects.

International audience; The age-associated reduction in the proliferation of neural stem cells (NSCs) has been associated with cognitive decline. Numerous factors have been shown to modulate this process, including dietary components. Frequent consumption of caffeine has been correlated with an increased risk of cognitive decline, but further evidence of a negative effect on hippocampal progenitor proliferation is limited to animal models. Here, we used a human hippocampal progenitor cell line to investigate the effects of caffeine on hippocampal progenitor integrity and proliferation specifically. The effects of five caffeine concentrations (0 mM = control, 0.1 mM ∼ 150 mg, 0.25 mM ∼ 400 mg, 0.5 mM ∼ 750 mg, and 1.0 mM ∼ 1500 mg) were measured following acute (1 day) and repeated (3 days) exposure. Immunocytochemistry was used to quantify hippocampal progenitor integrity (i.e., SOX2- and Nestin-positive cells), proliferation (i.e., Ki67-positive cells), cell count (i.e., DAPI-positive cells), and apoptosis (i.e., CC3-positive cells). We found that progenitor integrity was significantly reduced in supraphysiological caffeine conditions (i.e., 1.0 mM ∼ 1500 mg), but relative to the lowest caffeine condition (i.e., 0.1 mM ∼ 150 mg) only. Moreover, repeated exposure to supraphysiological caffeine concentrations (i.e., 1.0 mM ∼ 1500 mg) was found to affect proliferation, significantly reducing % Ki67-positive cells relative to control and lower caffeine dose conditions (i.e., 0.1 mM ∼ 150 mg and 0.25 mM ∼ 400 mg). Caffeine treatment did not influence apoptosis and there were no significant differences in any measure between lower doses of caffeine (i.e., 0.1 mM, 0.25 mM, 0.5 mM) - representative of daily human caffeine intake - and control conditions. Our study demonstrates that dietary components such as caffeine can influence NSC integrity and proliferation and may be indicative of a mechanism by which diet affects cognitive outcomes.

Bismuth vanadate modified with reduced graphene oxide (BiVO 4 /rGO) was synthesized with the aim of applying this semiconductor material in advanced oxidative processes (AOPs) using the photoelectrocatalytic properties of the material for caffeine degradation. The semiconductor material was characterized by Scanning electronic microscopy, X-ray diffraction, Raman spectroscopy and UV–Vis Diffuse reflectance spectrophotometry. Photo-assisted linear sweep voltammetry experiments were carried out in order to evaluate the photocurrent generated in the processes. BiVO 4/rGO was found to exhibit relatively better photoelectrocatalytic performance compared to bare BiVO4 ; this result confirms the fundamental role of the carbon-based material when it comes to photoanode construction. With regard to caffeine degradation by high performance liquid chromatography through the application of BiVO 4/rGO photoanode, the signal used for monitoring the presence of the analyte exhibited a decrease of 100% of caffeine concentration from the original concentration, indicating the efficient removal of the compound from the sample.

Objectives: Certain Coffee is one of the most popular and consumable drinks worldwide. However, there are conflicting results on the influence of this drink in oral and pharyngeal cancer risk. To clarify this, we aimed to systemically review and carry out a meta-analysis of the relevant literature on the association between coffee and oral and pharyngeal cancer. Study Design: We carried out an electronic search of publications up to August 2016 from PubMed, National Library of Medicines Medline, Embase, Science Direct and the Cochrane Central Register. The Newcastle–Ottawa scale was used to address the quality of the studies a meta-analysis was carried out using random-effects models. Results: From the 22,515 entries identified in the search, 13 case-control and 4 cohort studies were selected. With regards to quality on the Newcastle-Ottawa scale, an overall value of 6.06 was obtained. The analysis for oral and pharyngeal cancer grouped together indicated a pooled OR of .69 (95% CI of .57-.84; p

Resumen Objetivo: Determinar los factores asociados a la cantidad de horas de sueño, somnolencia diurna e insomnio antes y durante un periodo de clases y exámenes. Material y métodos: Se evaluó a 384 alumnos de ambos sexos (74,1% mujeres), quienes reportaron su peso y estatura. A cada estudiante se le aplicó el Cuestionario de Insomnio y la Escala De Somnolencia de Epworth en el periodo de clases y periodo de exámenes. Resultados: Al comparar la somnolencia diurna, insomnio, latencia al sueño y cantidad de horas de sueño entre periodo de clases y exámenes se observó un incremento en la latencia al sueño (p

Background An acute bout of exercise induces an inflammatory response characterized by increases in several cytokines. Caffeine ingestion could modify this inflammatory response. The aim of this study was to determine the effects of caffeine supplementation on plasma levels of cytokines, mainly IL-10 and IL-6, in response to exercise. Methods In a randomized, crossover, double-blinded study design, thirteen healthy, well-trained recreational male athletes performed, on two different occasions, a treadmill exercise test (60 min at 70% VO(2)max) after ingesting 6 mg/kg body mass of caffeine or placebo. Blood samples were taken before exercising, immediately after finishing and 2 h after finishing the exercise. Plasma concentrations of IL-10, IL-6, IL-1 beta, IL-1ra, IL-4, IL-8, IL-12 and IFN-gamma, adrenaline, cortisol and cyclic adenosine monophosphate (cAMP) were determined. The capacity of whole blood cultures to produce cytokines in response to endotoxin (LPS) was also determined. Changes in blood variables were analyzed using a time (pre-exercise, post-exercise, recovery) x condition (caffeine, placebo) within-between subjects ANOVA with repeated measures. Results Caffeine supplementation induced higher adrenaline levels in the supplemented participants after exercise (257.3 +/- 53.2 vs. 134.0 +/- 25.7 pg center dot mL(- 1),p = 0.03) and higher cortisol levels after recovery (46.4 +/- 8.5 vs. 32.3 +/- 5.6 pg center dot mL(- 1),p = 0.007), but it did not influence plasma cAMP levels (p = 0.327). The exercise test induced significant increases in IL-10, IL-6, IL-1ra, IL-4, IL-8, IL-12 and IFN-gamma plasma levels, with IL-6 and IL-10 levels remaining high after recovery. Caffeine supplementation influenced only IL-6 (3.04 +/- 0.40 vs. 3.89 +/- 0.62 pg center dot mL(- 1),p = 0.003) and IL-10 (2.42 +/- 0.54 vs. 3.47 +/- 0.72 pg center dot mL(- 1),p = 0.01) levels, with higher concentrations after exercise in the supplemented condition. No effect of caffeine was observed on the in vitro stimulated cytokine production. Conclusions The results of the present study indicate a significant influence of caffeine supplementation increasing the response to exercise of two essential cytokines such as IL-6 and IL-10. However, caffeine did not influence changes in the plasma levels of other cytokines measured and the in vitro-stimulated cytokine production., We acknowledge the Ministerio de Economia, Industria y Competitividad (MINECO), the Agencia Estatal de Investigacion (AEI) and the European Regional Development Funds (ERDF) for its support to the project DEP2013-45966-P (MINECO/AEI/ERDF, EU).

Introducción: La cafeína es el psicoestimulante más consumido en el mundo. Su uso entre los niños es controvertido, aunque produce un aumento en la actividad cerebral, podría obstaculizar el crecimiento y el desarrollo en los consumidores jóvenes. El objetivo de esta revisión fue identificar cuáles son los efectos físicos y cognitivos del consumo de cafeína por niños. Materiales y métodos: Los detalles del protocolo para esta revisión sistemática se registraron en PROSPERO y se puede acceder a ellos en www.crd.york.ac.uk/PROSPERO/display_record.asp?ID=CRDXXXXXXXXXXX. Los motores de búsqueda utilizados, fueron EBSCO, ScienceDirect, Pub Med y Clarivate analytics. Los criterios de elegibilidad fueron sujetos menores de 12 años con ingesta o administración de cafeína que manifestaran cambios físicos o cognitivos. Resultados: Inicialmente, se encontraron 5.453 artículos, de los que se seleccionaron 20 estudios experimentales u observacionales (transversales y longitudinales) para esta revisión, siguiendo la metodología PRISMA. Conclusiones: Los resultados obtenidos mostraron que el consumo de cafeína en esta población, puede provocar alteraciones en el crecimiento, al producir alteraciones en el ciclo del sueño, debido a que interfiere con la secreción de la hormona del crecimiento. Por otro lado, el rendimiento cognitivo fue mejor en niños con historial de uso de citrato de cafeína en casos de apnea del prematuro. Para las alteraciones paidopsiquiátricas, se encontró evidencia de que la caféína produce una mejor distribución de la energía cerebral, aunque puede exacerbar la sintomatología en el TDAH y el autismo.

Caffeine improves cycling time trial performance through enhanced motor output and muscle recruitment. However, it is unknown if caffeine further increases power output entropy. To investigate the effects of caffeine effects on cycling time trial performance and motor output entropy (MOEn), nine cyclists (VO2MAX of 55 ± 6.1 mL.kg.-1min-1) performed a 4 km cycling time trial (TT4km) after caffeine and placebo ingestion in a counterbalanced order. Power output data were sampled at a 2 Hz frequency, thereafter entropy was estimated on a sliding-window fashion to generate a power output time series. A number of mixed models compared performance and motor output entropy between caffeine and placebo every 25% of the total TT4km distance. Caffeine ingestion improved power output by 8% (p = 0.003) and increased MOEn by 7% (p = 0.018). Cyclists adopted a U-shaped pacing strategy after caffeine ingestion. MOEn mirrored power output responses as an inverted U-shape MOEn during the time trial. Accordingly, a strong inverse correlation was observed between MOEn and power output responses over the last 25% of the TT4km (p < 0.001), regardless of the ingestion, likely reflecting the end spurt during this period (p = 0.016). Caffeine ingestion improved TT4km performance and motor output responses likely due to a greater power output entropy.

Ethanol consumption has been reported to negatively impact on periodontal disease. In particular, oral cavity disorders occur upon ethanol exposure during adolescence, a life period associated with particular patterns of short and intense ('binge-like') ethanol consumption that is most deleterious to oral health. The hazardous central effects of ethanol have been linked to the overfunction of adenosine receptors, which are antagonized by caffeine, a bioactive substance present in numerous natural nutrients, which can also modify bone metabolism. The aim of this study was to investigate the effects of caffeine on alveolar bone damage induced by an ethanol binge drinking paradigm during adolescence. Female Wistar rats (35 days old; n = 30) were allocated to six groups: control (vehicle), ethanol (3 g/kg/day; 3 days On-4 days Off challenge), caffeine (10 mg/kg/day), caffeine plus ethanol, SCH58261 (0.1 mg/kg/day, an antagonist of A2A receptors), and SCH58261 plus ethanol. Bone micromorphology and vertical bone loss were analyzed by computed microtomography. Our data showed that ethanol binge drinking reduced alveolar bone quality, with repercussion on alveolar bone size. This ethanol-induced alveolar bone deterioration was abrogated upon treatment with caffeine, but not with SCH58261. This shows that caffeine prevented the periodontal disorder caused by ethanol binge drinking during adolescence, an effect that was not mediated by adenosine A2A receptor blockade.

We investigated the effect of caffeine ingestion combined with a 2-wk sprint interval training (SIT) on training-induced reductions in body adiposity. Twenty physically-active men ingested either 5 mg/kg of cellulose as a placebo (PLA, n=10) or 5 mg/kg of caffeine (CAF, n=10) 60 min before each SIT session (13×30 s sprint/15 s of rest). Body mass and skinfold thickness were measured pre- and post-training. Energy expenditure was measured at rest, during exercise, and 45 min after exercise in the first SIT session. Body fat was similar between PLA and CAF groups at pre-training (P>0.05). However, there was a significant decrease in body fat after training in the CAF group (−5.9±4.2%, P0.05). There was no difference in energy expenditure at rest and during exercise between PLA and CAF groups (P>0.05), but the post-exercise energy expenditure was 18.3±21.4% greater in the CAF than in the PLA group (P

The Ginoide Hydrolipodystrophy (GHLD), commonly known as cellulite, occurs in 80-90% of the female population after the puberty period and comes from a metabolic modification in the cutaneous adipose tissue. Caffeine has been used in topical formulations due to its lipolytic action. We studied a nanoemulsion (F3) containing caffeine with two surfactants (oleth-3 and oleth-20) by emulsification method by phase inversion temperature inversion (PIT). The polydispersion indices (PDI) showed the reduced deviation of 0.1. The mean droplet size was ~ 40 nm. The evaluated constant of Ostwald, in the refrigerator condition was the most favorable during the stability test. In the In Raman spectroscopy assay, the caffeine bands found in F3 were compatible with those found in the caffeine solution (1337, 652.5 and 558.2 cm-1). There was no interaction of caffeine anhydrous with other ingredients in nanoemulsion. In the in vitro safety assay the result of 1.4 ranked the F3 as slightly irritating. In the natural membrane, cutaneous permeation test (human skin) permeate concentrations did not exceed the saturation concentration of the PBS buffer (48.96 µg/3 mL). The caffeine solution and F3 permeated statistically equal, but the nanoemulsion visually and sensorially improved the caffeine precipitation.

RESUMEN La alta y desigual prevalencia de cáncer oral y faríngeo, junto al alto consumo de café a nivel mundial, hacen que se realicen estudios para analizar cómo contribuye el consumo de estas bebidas que contienen metilxantinas en el riesgo de estas neoplasias, aunque con resultados contradictorios. El objetivo del presente estudio fue comprobar la validez y la aplicabilidad de los resultados con respecto a la efectividad del alto consumo de café en adultos como factor protector del cáncer oral y faríngeo y responder al siguiente interrogante: ¿puede un alto consumo de café en bebida ser un factor protector contra el cáncer oral y faríngeo? Se analizó el artículo de Miranda et al. (2017): “El café es protector contra el cáncer oral y faríngeo: una revisión sistemática y metaanálisis”. Se encontró una asociación protectora significativa entre el consumo de café y el riesgo de cáncer oral, y faríngeo especialmente (z=2,34; p=0,019; OR=0,72), infiriendo que el desarrollo del cáncer oral en individuos que consumen grandes cantidades de café es 1,45 veces menor que en individuos que consumen poca cantidad o no consumen (OR=0,69; 95%IC=0,57-0,84). No obstante, con las limitaciones metodológicas de los estudios primarios incluidos en la revisión sistemática con metaanálisis, no consideramos suficiente la evidencia actual moderada para recomendar el consumo de altas cantidades de la bebida de café para prevenir cáncer oral o faríngeo en personas adultas.

Purpose: To verify whether caffeine (CAF) could increase the prefrontal cortex (PFC) activation\ud and improve 20 km cycling time trial (TT20km) performance in mentally fatigued cyclists. Methods:\ud After preliminary TT20km, twelve recreational cyclists (VO2MAX of 58.9 ± 6.2 mL∙kg∙min-1\ud )\ud performed a familiarization with a cognitive test to induce mental fatigue (MF) and psychological\ud scales. Thereafter, they performed: 2) a baseline TT20km; 3) a mentally fatigued TT20km (MF); 4 and\ud 5) a mentally fatigued TT20km after CAF (MF+CAF) or placebo (MF+PLA) ingestion, in a doubleblind, counterbalanced design. Performance and psychological responses were obtained throughout\ud the TT20km, while PFC electroencephalography (EEG) theta wave was obtained before and after the\ud mental fatigue test. Results: The mental fatigue-induced increase in EEG theta wave (↑ ~ 4.8 %)\ud was reverted with CAF (↓ 8.8 %) and PLA ingestion (↓ 4.8 %). CAF improved TT20km performance\ud in mentally fatigued cyclists by reducing time (p = 0.00; ↓ ~1.7 %) and increasing WMEAN (p = 0.00;\ud ↑ ~3.6%), when compared to MF+PLA. The RPE-power output ratio was lower (p = 0.01), but\ud affect (p = 0.018), motivation (p = 0.033) and emotional arousal (p = 0.001) were greater\ud throughout the TT20km in MF+CAF than in MF+PLA. Conclusions: CAF ingestion improved\ud TT20km performance and psychological responses in mentally fatigued cyclists, despite the unaltered\ud PFC activation.

Coffee is consumed worldwide, but there are different types of espresso blends, each with its unique concentration of caffeine, which can have different effects on the human being. The aim of this study was to understand the effect of the impact of caffeine on the autonomic nervous system, evaluating the physiological changes and subjective responses due to different levels of caffeine intake. A double-blind tasting task consisting of one within-subject factor design (caffeine level: high / double caffeine mixture (blend A) vs single-charge caffeine mixture (blend B) vs low-caffeine mixture (blend c) allowed us to assess participants’ autonomic responses using Heart Rate Variability (HRV) and Pupillary Reactivity (PR). Arousal was also assessed through the Self-Assessment Manikin (SAM). Results revealed statistically significant differences in HRV and PR between coffee blends, showing the blend A,a more pronounced autonomic response that blend C. However, no significant differences were found in arousal level among coffee blends. These results are similar to previous research that pointed out to a discordance between subjective and objective measures when caffeine is consumed.

Cryopreservation of in vitro produced bovine embryos is associated with significantly reduced survival rates, mainly due to insufficient quality of the embryos. Caffeine supplementation during IVM has been used to delay meiotic resumption and concomitantly also increased embryo quality. Here, we investigated the influence of pre-IVM with caffeine on oocyte maturation, intraoocyte cAMP concentration, developmental competence after IVF, and blastocyst cryotolerance. Oocytes were obtained by slicing of ovaries and were submitted to either 2 hours culture before IVM with or without caffeine (0, 1, 5, 10, 20, 30 mM), or standard IVM (no pre-IVM). Oocytes were in vitro matured and fertilized and zygotes were cultured under standard in vitro conditions until Day 8. Expanded blastocysts derived from either standard control or the 10-mM caffeine treatments were submitted to vitrification. Caffeine delayed meiotic resumption after 9-hour IVM in a concentration-dependent manner. The cAMP levels were similar before and after IVM. Matured oocytes, cleavage, and blastocyst rates were reduced in the 30-mM caffeine concentration and were similar among the other treatment groups. Number and proportion of inner cell mass and trophectoderm cells in blastocysts did not differ among treatments. Forty-eight hours after thawing, hatching rates were higher in the 10-mM caffeine group (73.8%) compared with the standard control (59.7%). Reexpansion rates and total number of cells after 48 hours were similar in both treatments. The ratio of live/total cells was higher in the caffeine treatment. These results suggest that caffeine supplementation before IVM delayed meiotic resumption and improved blastocyst quality shown in higher cryotolerance.

Non-alcoholic fatty liver disease is a highly prevalent condition without specific pharmacological treatment, characterized in the initial stages by hepatic steatosis. It was suggested that lipid infiltration in the liver might be reduced by caffeine through anti-inflammatory, antioxidative, and fatty acid metabolism-related mechanisms. We investigated the effects of caffeine (CAF) and green coffee extract (GCE) on hepatic lipids in lean female rats with steatosis. For three months, female Sprague-Dawley rats were fed a standard diet or a cocoa butter-based high-fat diet plus 10% liquid fructose. In the last month, the high-fat diet was supplemented or not with CAF or a GCE, providing 5 mg/kg of CAF. Plasma lipid levels and the hepatic expression of molecules involved in lipid metabolism were determined. Lipidomic analysis was performed in liver samples. The diet caused hepatic steatosis without obesity, inflammation, endoplasmic reticulum stress, or hepatic insulin resistance. Neither CAF nor GCE alleviated hepatic steatosis, but GCE-treated rats showed lower hepatic triglyceride levels compared to the CAF group. The GCE effects could be related to reductions of hepatic (i) mTOR phosphorylation, leading to higher nuclear lipin-1 levels and limiting lipogenic gene expression, (ii) diacylglycerol levels, (iii) hexosylceramide/ceramide ratios, and (iv) very-low-density lipoprotein receptor expression. In conclusion, a low dose of CAF did not reduce hepatic steatosis in lean female rats, but the same dose provided as a green coffee extract led to lower liver triglyceride levels.

Producción Científica, Soccer is a complex team sport and success in this discipline depends on different factors such as physical fitness, player technique and team tactics, among others. In the last few years, several studies have described the impact of caffeine intake on soccer physical performance, but the results of these investigations have not been properly reviewed and summarized. The main objective of this review was to evaluate critically the effectiveness of a moderate dose of caffeine on soccer physical performance. A structured search was carried out following the Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) guidelines in the Medline/PubMed and Web of Science databases from January 2007 to November 2018. The search included studies with a cross-over and randomized experimental design in which the intake of caffeine (either from caffeinated drinks or pills) was compared to an identical placebo situation. There were no filters applied to the soccer players’ level, gender or age. This review included 17 articles that investigated the effects of caffeine on soccer-specific abilities (n = 12) or on muscle damage (n = 5). The review concluded that 5 investigations (100% of the number of investigations on this topic) had found ergogenic effects of caffeine on jump performance, 4 (100%) on repeated sprint ability and 2 (100%) on running distance during a simulated soccer game. However, only 1 investigation (25%) found as an effect of caffeine to increase serum markers of muscle damage, while no investigation reported an effect of caffeine to reduce perceived fatigue after soccer practice. In conclusion, a single and moderate dose of caffeine, ingested 5–60 min before a soccer practice, might produce valuable improvements in certain abilities related to enhanced soccer physical performance. However, caffeine does not seem to cause increased markers of muscle damage or changes in perceived exertion during soccer practice.

Producción Científica, Most studies that have shown the positive effects of caffeine supplementation on sports performance have been carried out on men. However, the differences between sexes are evident in terms of body size, body composition, and hormonal functioning, which might cause different outcomes on performance for the same dosage of caffeine intake in men vs. women. The main aim of this systematic review was to analyze and compare the effects of caffeine intake between men and women on sports performance to provide a source of knowledge to sports practitioners and coaches, especially for those working with women athletes, on the use of caffeine as an ergogenic aid. A structured search was carried out following the Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) guidelines in the Web of Science, Cochrane Library, and Scopus databases until 28 July 2019. The search included studies in which the effects of caffeine supplementation on athletic performance were compared between sexes and to an identical placebo situation (dose, duration and timing). No filters were applied for participants’ physical fitness level or age. A total of 254 articles were obtained in the initial search. When applying the inclusion and exclusion criteria, the final sample was 10 articles. The systematic review concluded that four investigations (100% of the number of investigations on this topic) had not found differences between sexes in terms of caffeine supplementation on aerobic performance and 3/3 (100%) on the fatigue index. However, four out of seven articles (57.1%) showed that the ergogenicity of caffeine for anaerobic performance was higher in men than women. In particular, it seems that men are able to produce more power, greater total weight lifted and more speed with the same dose of caffeine than women. In summary, caffeine supplementation produced a similar ergogenic benefit for aerobic performance and the fatigue index in men and women athletes. Nevertheless, the effects of caffeine to produce more power, total weight lifted and to improve sprint performance with respect to a placebo was higher in men than women athletes despite the same dose of caffeine being administered. Thus, the ergogenic effect of acute caffeine intake on anaerobic performance might be higher in men than in women.

Introducción. Las bebidas energizantes son preparaciones con contenido de sustancias estimulantes. En los últimos tiempos, la prevalencia de uso de estas bebidas entre adolescentes y adultos jóvenes ha ido en aumento Objetivo. Describir la prevalencia y los patrones de consumo de bebidas energizantes entre estudiantes universitarios de la Corporación Universitaria Rafael Núñez de Cartagena. Métodos. Se llevó a cabo un estudio observacional, descriptivo y de corte transversal. Se utilizó un instrumento previamente validado y sometido a una prueba piloto, para caracterizar la frecuencia y los patrones de consumo de bebidas energizantes en 558 estudiantes de 10 programas profesionales de la Corporación Universitaria Rafael Núñez. Resultados. La prevalencia del consumo de bebidas energizantes fue de 35 %. En los programas de Bacteriología e Instrumentación Quirúrgica se encontró la mayor prevalencia de consumo. Se encontró una diferencia estadísticamente significativa entre ser consumidor de bebidas energizantes y programa académico (p

The purpose of this study was to determine the effects of consumption of different cocoa-derived products on uric acid crystallization in urine of 20 healthy volunteers. Participants were requested to select the specific diet that they wished to follow during the 12 h prior to collection of urine. The only restriction was that the diet could not include any product with cocoa, coffee, or caffeine. On the first day, each volunteer followed their selected diet, and an overnight 12 h urine sample was collected as the baseline urine. After seven days on an unrestricted diet, each volunteer repeated the same diet with 20 g of milk chocolate, chocolate powder, or dark chocolate during breakfast and another 20 g during dinner. Overnight 12 h urine samples were then collected. Urine volume, pH, oxalate, creatinine, uric acid, theobromine, and a uric acid crystallization test were determined for each sample. The results for all 20 patients show that uric acid crystallization was significantly lower following the consumption of chocolate powder or dark chocolate relative to baseline or following the consumption of milk chocolate. The results indicated that increased concentrations of urinary theobromine reduced the risk of uric acid crystallization.

Introducción: La conducta de «atracón» consiste en consumir, en un período breve de tiempo, más cantidad de alimentos del que se consumiría normalmente en situaciones similares y en un plazo de tiempo igual. Es una conducta desadaptativa caracterizada por episodios compulsivos y que va acompañada por la sensación subjetiva de pérdida de control. Método: Con el objetivo de evaluar la implicación de los sistemas dopaminérgico y adenosinérgico en la conducta de atracón, y averiguar si el patrón de acceso a la comida dulce modifica los niveles de consumo compulsivo, se compararon dos grupos de animales con diferentes condiciones de acceso a pellets de comida dulce (50 % de sucrosa): condición de acceso diario y condición de acceso intermitente (lunes, miércoles y viernes). Los animales tenían una hora de acceso a un número ilimitado de pellets. El resto del tiempo, tuvieron acceso a comida estándar. A cada grupo se le administraron dos manipulaciones farmacológicas: tetrabenazina (inhibidor del transportador vesicular 2 de monoaminas que produce una reducción de los niveles de dopamina) y cafeína (antagonista de los receptores A1/A2A de adenosina). Resultados: Ambos regímenes de acceso a comida dulce produjeron un patrón de atracón. El peso de los animales de ambos grupos incrementó de igual manera. El consumo de comida estándar fue ligeramente superior en el grupo intermitente y el de comida dulce fue ligeramente mayor en aquellos que la consumían a diario. La depleción dopaminérgica, incluso a dosis altas, no produjo cambios en el consumo dulce, ni en condiciones familiares ni en situaciones ansiogénicas. Sin embargo, la cafeína a dosis altas incrementó el consumo de comida dulce en condiciones familiares y la redujo en condiciones ansiogénicas. Conclusiones: El sistema dopaminérgico no parece implicado en el atracón bajo condiciones que no requieren esfuerzo en la búsqueda de comida. El antagonismo adenosinérgico, sin embargo, ejerce una modulación bidireccional dependiendo de los niveles de ansiedad. Introduction: Binge eating is a maladaptative behavior characterized by the consumption of more food in a brief period of time, than would normally be consumed under similar conditions and within a similar period of time. It is accompanied by compulsive episodes and a sensation of loss of control. Method: To investigate the involvement of dopamine and adenosine systems in binge eating behavior, and assess the influence of different patterns of access to sweet food on levels of binge eating, we compared two groups of animals with different access conditions to sweet food pellets (50 % sucrose): daily access group and intermittent access group (Monday, Wednesday and Friday). Mice had an hour of unlimited access to sweet pellets. The rest of the day they had free access to standard food pellets in the home cage. Each group recieved two pharmacological conditions: tetrabenazine (a dopamine depletor) and caffeine (an adenosine receptor antagonist). Results: Both groups of access to sweet food produced a pattern of binge eating. Mice body weight increased independently of the access pattern. Standard food consumption was higher in the intermittent group, but among the daily group, sweet pellets consumption was higher than among the intermittent group. Dopamine depletion, even at high doses, produced no changes in the amount of sweet food consumed, neither under familiar conditions nor under anxiogenic conditions. However, high doses of caffeine increased consumption of sweet pellets under familiar conditions and it reduced consumption under anxiogenic conditions. Conclusions: The dopaminergic system does not seem to be involved in binge eating when getting access to food does not require effort. However, adenosine antagonism has a bidirectional modulation depending on anxiety levels.