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caffeine and performance

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https://www.readbyqxmd.com/read/29325962/systematic-review-of-factors-influencing-surgical-performance-practical-recommendations-for-microsurgical-procedures-in-neurosurgery
#1
Evgenii Belykh, Naomi R Onaka, Iraklii T Abramov, Kaan Yağmurlu, Vadim A Byvaltsev, Robert F Spetzler, Peter Nakaji, Mark C Preul
BACKGROUND: Microneurosurgical techniques involve complex manual skills and hand-eye coordination that require substantial training. Many factors affect microneurosurgical skills. The goal of this study was to use a systematic evidence-based approach to analyze the quality of evidence for intrinsic and extrinsic factors that influence microneurosurgical performance and to make weighted practical recommendations. MATERIALS AND METHODS: A literature search of factors that may impact microsurgical performance was conducted using PubMed and Embase...
January 8, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29324066/systematic-review-and-meta-analysis-of-the-effects-of-caffeine-in-fatigued-shift-workers-implications-for-emergency-medical-services-personnel
#2
Jennifer L Temple, David Hostler, Christian Martin-Gill, Charity G Moore, Patricia M Weiss, Denisse J Sequeira, Joseph P Condle, Eddy S Lang, J Stephen Higgins, P Daniel Patterson
BACKGROUND: Emergency Medical Services (EMS) workers may experience fatigue as a consequence of shift work. We reviewed the literature to determine the impact of caffeine as a countermeasure to fatigue in EMS personnel and related shift workers. METHODS: We employed the GRADE methodology to perform a systematic literature review and search multiple databases for research that examined the impact of caffeine on outcomes of interest, such as patient and EMS personnel safety...
January 11, 2018: Prehospital Emergency Care
https://www.readbyqxmd.com/read/29324060/proposed-performance-measures-and-strategies-for-implementation-of-the-fatigue-risk-management-guidelines-for-emergency-medical-services
#3
Christian Martin-Gill, J Stephen Higgins, Hans P A Van Dongen, Daniel J Buysse, Ronald W Thackery, Douglas F Kupas, David S Becker, Bradley E Dean, George H Lindbeck, Francis X Guyette, Josef H Penner, John M Violanti, Eddy S Lang, P Daniel Patterson
BACKGROUND: Performance measures are a key component of implementation, dissemination, and evaluation of evidence-based guidelines (EBGs). We developed performance measures for Emergency Medical Services (EMS) stakeholders to enable the implementation of guidelines for fatigue risk management in the EMS setting. METHODS: Panelists associated with the Fatigue in EMS Project, which was supported by the National Highway Traffic Safety Administration (NHTSA), used an iterative process to develop a draft set of performance measures linked to 5 recommendations for fatigue risk management in EMS...
January 11, 2018: Prehospital Emergency Care
https://www.readbyqxmd.com/read/29322637/maternal-exposures-and-risk-of-oral-clefts-in-south-vietnam
#4
Vu H A Dien, Christy M McKinney, Araya Pisek, Waranuch Pitiphat
BACKGROUND: Oral clefts are among the most common congenital anomalies. Most studies on risk factors of oral clefts have been carried out in developed countries. We investigated the associations between maternal exposures in the first trimester and oral clefts in South Vietnam. METHODS: We conducted a hospital-based case-control study during October 2014-November 2015. Cases included 170 patients with nonsyndromic cleft lip with or without cleft palate and those with cleft palate only...
January 11, 2018: Birth Defects Research
https://www.readbyqxmd.com/read/29318792/hemodynamic-effects-on-systemic-blood-flow-and-ductal-shunting-flow-after-loading-dose-of-intravenous-caffeine-in-preterm-infants-according-to-the-patency-of-ductus-arteriosus
#5
Jihye Hwang, Yu Seon Kim, Jeong Hee Shin, Byung Min Choi
BACKGROUND: In preterm infants, caffeine citrate is used to stimulate breathing before they are weaned from mechanical ventilation and to reduce the frequency of apnea. In recent studies, effects of caffeine on the cardiovascular system have been emphasized in preterm infants with patent ductus arteriosus (PDA). METHODS: This study aimed to assess the short-term hemodynamic effects on systemic blood flow and ductal shunting flow after loading standard doses of intravenous caffeine in preterm infants...
January 22, 2018: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/29306453/a-caffeine-containing-weight-loss-supplement-augments-hemodynamic-responses-after-exercise
#6
S R Buchanan, M Karabulut
BACKGROUND: Since the effects of supplements can be potentially harmful and/or ineffective to obtain desired positive benefits, there is a need to investigate supplementation to understand the responses of physiological systems, to educate consumers, and to provide feedback for businesses creating these supplements. The purpose of the current study was to test hemodynamic responses of a weight loss supplement and determine its effects on hemodynamic variables. METHODS: 31 participants underwent a randomized, double-blind, crossover study design and received a placebo or supplement on two separate days...
February 15, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29281263/correction-for-the-hematocrit-bias-in-dried-blood-spot-analysis-using-a-non-destructive-single-wavelength-reflectance-based-hematocrit-prediction-method
#7
Sara Capiau, Leah S Wilk, Pieter M M de Kesel, Maurice C G Aalders, Christophe P Stove
The hematocrit (Hct) effect is one of the most important hurdles currently preventing more widespread implementation of quanti-tative dried blood spot (DBS) analysis in a routine context. Indeed, the Hct may affect both the accuracy of DBS methods, as well as the interpretation of DBS-based results. We previously developed a method to determine the Hct of a DBS based on its hemoglobin content using non-contact diffuse reflectance spectroscopy. Despite the ease with which the analysis can be performed (i.e. mere scanning of the DBS) and the good results which were obtained, the method did require a complicated algorithm to derive the total hemoglobin content from the DBS's reflectance spectrum...
December 27, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29280665/use-of-nutritional-supplements-and-ergogenic-aids-in-professional-tennis-players
#8
Álvaro López-Samanes, Víctor Moreno-Pérez, Mark S Kovacs, Jesús G Pallarés, Ricardo Mora-Rodríguez, Juan F Ortega
INTRODUCTION: Nutritional supplements and ergogenic aids (NS&EA) are used between training/matches with the goal of enhancing tennis performance. Scientific literature about prevalence and use of NS&EA in professional tennis players is scarce. OBJECTIVE: The aim of the study was to describe the NS&EA used by professional tennis players during a season. METHODS: Using a validated self-administered questionnaire, 62 professional male and 9 professional female tennis players (11% in their gender specific top 100 tennis world ranking (i...
November 17, 2017: Nutrición Hospitalaria: Organo Oficial de la Sociedad Española de Nutrición Parenteral y Enteral
https://www.readbyqxmd.com/read/29273820/effects-of-caffeine-on-reaction-time-are-mediated-by-attentional-rather-than-motor-processes
#9
Christopher W N Saville, H M de Morree, Neil M Dundon, S M Marcora, C Klein
BACKGROUND: Caffeine has a well-established effect on reaction times (RTs) but the neurocognitive mechanisms underlying this are unclear. METHODS: In the present study, 15 female participants performed an oddball task after ingesting caffeine or a placebo, and electroencephalographic data were obtained. Single-trial P3b latencies locked to the stimulus and to the response were extracted and mediation models were fitted to the data to test whether caffeine's effect on RTs was mediated by its effect on either type of P3b latencies...
December 23, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/29262272/effects-of-carbohydrate-mouth-rinse-and-caffeine-on-high-intensity-interval-running-in-a-fed-state
#10
Simon Devenney, Shane Mangan, Marcus Shortall, Kieran Collins
The current study aims to identify if mouth rinsing with a 6% carbohydrate solution (CMR) and mouth rinsing and ingestion of caffeine (CMR+CAFF) can affect exercise performance during steady state (SS) running and high intensity intervals (HIT) in comparison to a 0% control solution (PLA), when in a fed state. Eight recreationally trained males completed three trials (CMR, CMR + CAFF, and PLA) of 45-min SS run and a HIT protocol (90% peak treadmill velocity) until fatigue in a double blinded, repeated measures study...
December 20, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29247343/a-caffeine-maltodextrin-mouth-rinse-counters-mental-fatigue
#11
Jeroen Van Cutsem, Kevin De Pauw, Samuele Marcora, Romain Meeusen, Bart Roelands
INTRODUCTION: Mental fatigue is a psychobiological state caused by prolonged periods of demanding cognitive activity that has negative implications on many aspects in daily life. Caffeine and carbohydrate ingestion have been shown to be able to reduce these negative effects of mental fatigue. Intake of these substances might however be less desirable in some situations (e.g., restricted caloric intake, Ramadan). Rinsing caffeine or glucose within the mouth has already been shown to improve exercise performance...
December 15, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/29242183/frequency-of-a-diagnosis-of-glaucoma-in-individuals-who-consume-coffee-tea-and-or-soft-drinks
#12
Connie M Wu, Annie M Wu, Victoria L Tseng, Fei Yu, Anne L Coleman
AIMS: To evaluate the association between consumption of coffee, tea or soft drinks, and glaucoma in the participants of the 2005-2006 National Health and Nutrition Examination Survey (NHANES). METHODS: The exposures of interest of this retrospective cross-sectional study were caffeinated and decaffeinated coffee, iced tea, hot tea and soft drinks. The outcome of interest was a clinical diagnosis of glaucoma based on the Rotterdam criteria. Analysis of the correlation between the frequency of consumption of each type of beverage and glaucoma was performed using logistic regression modelling while controlling for age, body mass index, gender, ethnicity, smoking status and diabetes...
December 14, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29241955/determination-of-caffeine-theobromine-and-theophylline-in-mate-beer-and-mate-soft-drinks-by-high-performance-thin-layer-chromatography
#13
Claudia Oellig, Jacob Schunck, Wolfgang Schwack
Mate beer and Mate soft drinks are beverages produced from the dried leaves of Ilex paraguariensis (Yerba Mate). In Yerba Mate, the xanthine derivatives caffeine, theobromine and theophylline, also known as methylxanthines, are important active components. The presented method for the determination of caffeine, theobromine and theophylline in Mate beer and Mate soft drinks by high-performance thin-layer chromatography with ultraviolet detection (HPTLC-UV) offers a fully automated and sensitive determination of the three methylxanthines...
December 9, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29238244/influence-of-a-thermogenic-dietary-supplement-on-safety-markers-body-composition-energy-expenditure-muscular-performance-and-hormone-concentrations-a-randomized-placebo-controlled-double-blind-trial
#14
Grant M Tinsley, Stacie Urbina, Jacy Mullins, Jordan Outlaw, Sara Hayward, Matt Stone, Cliffa Foster, Colin Wilborn, Lem Taylor
Dietary supplementation is commonly employed by individuals seeking to improve body composition and exercise performance. The purpose of the present study was to examine the safety and effectiveness of a commercially available dietary supplement designed to promote thermogenesis and fat loss. In a randomized double-blind trial, participants were assigned to consume placebo or a multi-ingredient supplement containing caffeine, green tea extract, l-carnitine, evodiamine and other ingredients that purportedly enhance thermogenesis...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29224920/-pharmaceutical-cognitive-doping-in-students-a-chimeric-way-to-get-a-head
#15
Louise Carton, Nicolas Cabé, Olivier Ménard, Sylvie Deheul, Anne-Sylvie Caous, David Devos, Olivier Cottencin, Régis Bordet
For students, the pressing demands for memorization, top-level performance, and peer competition create an environment favorable for pharmaceutical cognitive doping behavior. We aimed to describe recent practices and the benefit / risk ratio of such behavior and to discuss the issues at stake. The prevalence of pharmaceutical cognitive doping among students has been reported from 1.3% to 33% across studies, with variations depending on country and definition of pharmaceutical cognitive doping. The therapeutic classes most frequently cited as being diverted for doping purposes are psychostimulants and nootropics (methylphenidate, modafinil, piracetam), corticosteroids, sedative drugs and beta-blockers...
November 22, 2017: Thérapie
https://www.readbyqxmd.com/read/29223460/investigation-of-anticancer-properties-of-caffeinated-complexes-via-computational-chemistry-methods
#16
Koray Sayin, Ayhan Üngördü
Computational investigations were performed for 1,3,7-trimethylpurine-2,6-dione, 3,7-dimethylpurine-2,6-dione, their Ru(II) and Os(III) complexes. B3LYP/6-311++G(d,p)(LANL2DZ) level was used in numerical calculations. Geometric parameters, IR spectrum, 1H-, 13C and 15N NMR spectrum were examined in detail. Additionally, contour diagram of frontier molecular orbitals (FMOs), molecular electrostatic potential (MEP) maps, MEP contour and some quantum chemical descriptors were used in the determination of reactivity rankings and active sites...
December 6, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29215336/caffeine-increases-apolipoprotein-a-1-and-paraoxonase-1-but-not-paraoxonase-3-protein-levels-in-human-derived-liver-hepg2-cells
#17
Gülben Sayılan Özgün, Eray Özgün, Kıymet Tabakçıoğlu, Selma Süer Gökmen, Sevgi Eskiocak, Erol Çakır
BACKGROUND: Apolipoprotein A-1, paraoxonase-1 and paraoxonase-3 are antioxidant and anti-atherosclerotic structural high-density lipoprotein proteins that are mainly synthesized by the liver. No study has ever been performed to specifically examine the effects of caffeine on paraoxonase enzymes and on liver apolipoprotein A-1 protein levels. AIMS: To investigate the dose-dependent effects of caffeine on liver apolipoprotein A-1, paraoxonase-1 and paraoxonase-3 protein levels...
December 1, 2017: Balkan Medical Journal
https://www.readbyqxmd.com/read/29214920/caffeine-effects-on-vo2max-test-outcomes-investigated-by-a-placebo-perceived-as-caffeine-design
#18
Cayque Brietzke, Ricardo Yukio Asano, Felipe De Russi de Lima, Fabiano Aparecido Pinheiro, Franco-Alvarenga, Carlos Ugrinowitsch, Flávio Oliveira Pires
BACKGROUND: Ergogenic effects of caffeine (CAF) ingestion have been observed in different cycling exercise modes, and have been associated with alterations in ratings of perceived exertion (RPE). However, there has been little investigation of maximal oxygen uptake (VO2MAX) test outcomes. AIM: This study aimed to verify whether CAF may reduce RPE, thereby improving maximal incremental test (MIT) outcomes such as VO2MAX, time to exhaustion and peak power output (WPEAK)...
December 2017: Nutrition and Health
https://www.readbyqxmd.com/read/29211339/%C3%AE-3-adrenoceptor-agonists-inhibit-carbachol-evoked-ca2-oscillations-in-murine-detrusor-myocytes
#19
Caoimhin S Griffin, Eamonn Bradley, Mark A Hollywood, Noel G McHale, Keith D Thornbury, Gerard P Sergeant
OBJECTIVE: To test if carbachol-evoked Ca2+ oscillations in freshly isolated murine detrusor myocytes were affected by β3-adrenoceptor modulators. MATERIAL & METHODS: Isometric tension recordings were made from strips of murine detrusor and intracellular Ca2+ measurements were made from isolated detrusor myocytes using confocal microscopy. Transcriptional expression of β-AR sub-types in detrusor strips and isolated detrusor myocytes was assessed using RT-PCR and real-time quantitative PCR...
December 6, 2017: BJU International
https://www.readbyqxmd.com/read/29210957/the-physiological-and-performance-effects-of-caffeine-gum-consumed-during-a-simulated-half-time-by-professional-academy-rugby-union-players
#20
Russell M, Reynolds N A, Crewther B T, Cook C J, Kilduff L
Despite the prevalence of caffeine as an ergogenic aid, few studies have examined the use of caffeinated gums, especially during half-time in team sports. The physiological (blood lactate, salivary hormone concentrations) and performance (repeated sprints, cognitive function) effects of consuming caffeine gum during a simulated half-time were examined. Professional academy rugby union players (n=14) completed this double-blind, randomized, counterbalanced study. Following pre-exercise measurements , players chewed a placebo (PL) gum for five min before a standardized warm-up and completing repeated sprint testing (RSSA1)...
November 27, 2017: Journal of Strength and Conditioning Research
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