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Caffeine ingestion

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https://www.readbyqxmd.com/read/27895607/caffeine-enhances-memory-performance-in-young-adults-during-their-non-optimal-time-of-day
#1
Stephanie M Sherman, Timothy P Buckley, Elsa Baena, Lee Ryan
Many college students struggle to perform well on exams in the early morning. Although students drink caffeinated beverages to feel more awake, it is unclear whether these actually improve performance. After consuming coffee (caffeinated or decaffeinated), college-age adults completed implicit and explicit memory tasks in the early morning and late afternoon (Experiment 1). During the morning, participants ingesting caffeine demonstrated a striking improvement in explicit memory, but not implicit memory. Caffeine did not alter memory performance in the afternoon...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/27894020/the-anatomical-mummies-of-mombello-detection-of-cocaine-nicotine-and-caffeine-in-the-hair-of-psychiatric-patients-of-the-early-20th-century
#2
Frank Musshoff, Helena Fels, Alberto Carli, Dario Piombino-Mascali
The Mombello Psychiatric Hospital in Limbiate, near Milan, replaced the old Senavra Hospital as the Psychiatric Hospital for the Province of Milan in the 19th century. During the early 20th century, bodies of several Mombello patients were dissected and preserved by Giuseppe Paravicini, an anatomist who operated within the asylum. The aim of the present study was to examine and memorialize this important assemblage. To this end, we were allowed to sample the head hair of six such preparations for toxicological analysis...
November 14, 2016: Forensic Science International
https://www.readbyqxmd.com/read/27882605/placebo-in-sports-nutrition-a-proof-of-principle-study-involving-caffeine-supplementation
#3
B Saunders, L F de Oliveira, R P da Silva, V de Salles Painelli, L S Gonçalves, G Yamaguchi, T Mutti, E Maciel, H Roschel, G G Artioli, B Gualano
We investigated the effects of supplement identification on exercise performance with caffeine supplementation. Forty-two trained cyclists (age 37 ± 8 years, body mass [BM] 74.3 ± 8.4 kg, height 1.76 ± 0.06 m, maximum oxygen uptake 50.0 ± 6.8 mL/kg/min) performed a ~30 min cycling time-trial 1 h following either 6 mg/kgBM caffeine (CAF) or placebo (PLA) supplementation and one control (CON) session without supplementation. Participants identified which supplement they believed they had ingested ("caffeine", "placebo", "don't know") pre- and post-exercise...
November 23, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27864638/effects-of-caffeine-on-neuromuscular-fatigue-and-performance-during-high-intensity-cycling%C3%A2-exercise-in-moderate-hypoxia
#4
Bruno P C Smirmaul, Antonio Carlos de Moraes, Luca Angius, Samuele M Marcora
PURPOSE: To investigate the effects of caffeine on performance, neuromuscular fatigue and perception of effort during high-intensity cycling exercise in moderate hypoxia. METHODS: Seven adult male participants firstly underwent an incremental exercise test on a cycle ergometer in conditions of acute normobaric hypoxia (fraction inspired oxygen = 0.15) to establish peak power output (PPO). In the following two visits, they performed a time to exhaustion test (78 ± 3% PPO) in the same hypoxic conditions after caffeine ingestion (4 mg kg(-1)) and one after placebo ingestion in a double-blind, randomized, counterbalanced cross-over design...
November 18, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27851893/caffeine-influences-cadence-at-lower-but-not-higher-intensity-rpe-regulated-cycling
#5
J Matt Green, Alyssa Olenick, Caroline Eastep, Lee Winchester
: Caffeine blunts RPE estimations but effects on selected cycling cadence are unclear. PURPOSE: This study examined influence of caffeine on cycling cadence with intensities prescribed at RPE 4 and 7 (OMNI Scale). METHODS: College-aged (20.5±2.0y) male and female volunteers (n=15) (VO2 peak=40.3±4.0,) completed a maximal cycling test followed by trials where they adjusted cadence (CAD) (clamped resistances) to produce overall feelings equivalent to RPE 4 (RPE4) and RPE 7 (RPE7) (10min each) following caffeine (CAF) (6mg·kg(-1)·min(-1)) and placebo (PLA) (counterbalanced) ingestion...
November 13, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27802855/a-remarkable-case-of-rhabdomyolysis-associated-with-ingestion-of-energy-drink-neon-volt
#6
Praneet S Iyer, Rishitha Yelisetti, Varun Miriyala, Waqas Siddiqui, Anand Kaji
Rhabdomyolysis is defined as a syndrome characterized by muscle necrosis and the release of intracellular muscle constituents into the circulation. We present a case of a 35-year-old male who exercised for 2 h after ingesting energy drink and subsequently presented with rhabdomyolysis. After excluding common and uncommon causes of rhabdomyolysis, we reached the conclusion that the likely cause was the ingestion of energy drink 'NEON VOLT' in a setting of mild dehydration. Increasing physical activity and intense exercise is becoming a trend in many countries, due to its many health-related benefits such as prevention of obesity...
2016: Journal of Community Hospital Internal Medicine Perspectives
https://www.readbyqxmd.com/read/27798441/runner-s-diarrhea-what-is-it-what-causes-it-and-how-can-it-be-prevented
#7
Erick P de Oliveira
PURPOSE OF REVIEW: Runner's diarrhea is an acute exercise-induced diarrhea. Usually, this is not a pathological situation but it can affect performance. This review focuses on the discussion of the main causes of runner's diarrhea and nutritional recommendations to prevent it. RECENT FINDINGS: Although based on limited data, multiple transportable carbohydrate intake during exercise instead of glucose alone can be recommended for preventing the urge to defecate and (possibly) diarrhea...
October 27, 2016: Current Opinion in Gastroenterology
https://www.readbyqxmd.com/read/27765356/anti-stress-effects-of-drinking-green-tea-with-lowered-caffeine-and-enriched-theanine-epigallocatechin-and-arginine-on-psychosocial-stress-induced-adrenal-hypertrophy-in-mice
#8
Keiko Unno, Ayane Hara, Aimi Nakagawa, Kazuaki Iguchi, Megumi Ohshio, Akio Morita, Yoriyuki Nakamura
BACKGROUND: Theanine, an amino acid in tea, has significant anti-stress effects on animals and humans. However, the anti-stress effects of drinking green tea have not yet been elucidated. HYPOTHESIS/PURPOSE: The present study aimed to explore anti-stress effects of green tea and roles of tea components in a mouse model of psychosocial stress. STUDY DESIGN: We examined anti-stress effects of three types of green teas, theanine-rich "Gyokuro", standard "Sencha", and Sencha with lowered caffeine (low-caffeine green tea)...
November 15, 2016: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/27764244/correction-caffeine-ingestion-increases-estimated-glycolytic-metabolism-during-taekwondo-combat-simulation-but-does-not-improve-performance-or-parasympathetic-reactivation
#9
João Paulo Lopes-Silva, Jonatas Ferreira da Silva Santos, Braulio Henrique Magnani Branco, César Cavinato Cal Abad, Luana Farias de Oliveira, Irineu Loturco, Emerson Franchini
[This corrects the article DOI: 10.1371/journal.pone.0142078.].
2016: PloS One
https://www.readbyqxmd.com/read/27762662/chronic-ingestion-of-a-low-dose-of-caffeine-induces-tolerance-to-the-performance-benefits-of-caffeine
#10
Ross Beaumont, Philip Cordery, Mark Funnell, Stephen Mears, Lewis James, Phillip Watson
This study examined effects of 4 weeks of caffeine supplementation on endurance performance. Eighteen low-habitual caffeine consumers (<75 mg · day(-1)) were randomly assigned to ingest caffeine (1.5-3.0 mg · kg(-1)day(-1); titrated) or placebo for 28 days. Groups were matched for age, body mass, V̇O2peak and Wmax (P > 0.05). Before supplementation, all participants completed one V̇O2peak test, one practice trial and 2 experimental trials (acute 3 mg · kg(-1) caffeine [precaf] and placebo [testpla])...
October 20, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27757591/acute-effects-of-caffeine-containing-energy-drinks-on-physical-performance-a-systematic-review-and-meta-analysis
#11
Diego B Souza, Juan Del Coso, Juliano Casonatto, Marcos D Polito
PURPOSE: Caffeine-containing energy drinks (EDs) are currently used as ergogenic aids to improve physical performance in a wide variety of sport disciplines. However, the outcomes of previous investigations on this topic are inconclusive due to methodological differences, especially, in the dosage of the active ingredients and the test used to assess performance. METHODS: We performed a systematic review and meta-analysis of published studies to evaluate the effects of acute ED intake on physical performance...
October 18, 2016: European Journal of Nutrition
https://www.readbyqxmd.com/read/27749954/short-term-effects-of-high-dose-caffeine-on-cardiac-arrhythmias-in-patients-with-heart-failure-a-randomized-clinical-trial
#12
Priccila Zuchinali, Gabriela C Souza, Maurício Pimentel, Diego Chemello, André Zimerman, Vanessa Giaretta, Joyce Salamoni, Bianca Fracasso, Leandro I Zimerman, Luis E Rohde
Importance: The presumed proarrhythmic action of caffeine is controversial. Few studies have assessed the effect of high doses of caffeine in patients with heart failure due to left ventricular systolic dysfunction at high risk for ventricular arrhythmias. Objective: To compare the effect of high-dose caffeine or placebo on the frequency of supraventricular and ventricular arrhythmias, both at rest and during a symptom-limited exercise test. Design, Setting, and Participants: Double-blinded randomized clinical trial with a crossover design conducted at the heart failure and cardiac transplant clinic of a tertiary-care university hospital...
December 1, 2016: JAMA Internal Medicine
https://www.readbyqxmd.com/read/27714637/headaches-a-review-of-the-role-of-dietary-factors
#13
Zoya Zaeem, Lily Zhou, Esma Dilli
Dietary triggers are commonly reported by patients with a variety of headaches, particularly those with migraines. The presence of any specific dietary trigger in migraine patients varies from 10 to 64 % depending on study population and methodology. Some foods trigger headache within an hour while others develop within 12 h post ingestion. Alcohol (especially red wine and beer), chocolate, caffeine, dairy products such as aged cheese, food preservatives with nitrates and nitrites, monosodium glutamate (MSG), and artificial sweeteners such as aspartame have all been studied as migraine triggers in the past...
November 2016: Current Neurology and Neuroscience Reports
https://www.readbyqxmd.com/read/27704869/caffeine-effects-on-velocity-selection-and-physiological-responses-during-rpe-production
#14
James M Green, Alyssa Olenick, Caroline Eastep, Lee Winchester
Caffeine (CAF) blunts estimated ratings of perceived exertion (RPE) but the effects on RPE production are unclear. This study examined effects of acute caffeine ingestion during treadmill exercise where participants exercised at prescribed RPE 4 and 7. Recreational runners (maximal oxygen consumption = 51.4 ± 9.8 mL·kg(-1)·min(-1)) (n = 16) completed a maximal treadmill test followed by trials where they selected treadmill velocity (VEL) (1% grade) to produce RPE 4 and RPE 7 (10 min each). RPE production trials followed CAF (6 mg·kg(-1)) or placebo (PLA) (counterbalanced) ingestion...
June 30, 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/27695980/effects-of-caffeine-ingestion-on-endurance-performance-in-mentally-fatigued-individuals
#15
Rafael Azevedo, Marcos David Silva-Cavalcante, Bruno Gualano, Adriano E Lima-Silva, Romulo Bertuzzi
PURPOSE: To examine the effects of caffeine ingestion on physiological and perceptual responses in mentally fatigued individuals. METHODS: Eight male physically active subjects completed four cycling constant-workload tests in four experimental conditions at 80 % of maximal power output: control (C), mental fatigue (MF), mental fatigue plus caffeine ingestion (5 mg/kg) (MF-CAF), and mental fatigue plus placebo (MF-PLA). The mental fatigue was induced by a continuous performance task A-X version (AX-CPT)...
September 30, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27651740/comparison-of-hemodynamic-effects-and-negative-predictive-value-of-normal-adenosine-gated-myocardial-perfusion-scan-with-or-without-caffeine-abstinence
#16
Maseeh Uz Zaman, Nosheen Fatima, Areeba Zaman, Unaiza Zaman, Rabia Tahseen
For vasodilator stress, myocardial perfusion imaging (MPI) with at least 12-h caffeine abstinence is recommended, as it attenuates cardiovascular hyperemic response of adenosine and dipyridamole. However, many published conflicting results have shown no significant effect upon perfusion abnormalities in MPI performed without caffeine abstinence. The aim of this study was to compare the hemodynamic changes and negative predictive value (NPV) of normal MPIs with adenosine stress performed with or without caffeine abstinence...
September 2016: World Journal of Nuclear Medicine
https://www.readbyqxmd.com/read/27633110/energy-drinks-and-their-impact-on-the-cardiovascular-system-potential-mechanisms
#17
REVIEW
Erik Konrad Grasser, Jennifer Lynn Miles-Chan, Nathalie Charrière, Cathríona R Loonam, Abdul G Dulloo, Jean-Pierre Montani
Globally, the popularity of energy drinks is steadily increasing. Scientific interest in their effects on cardiovascular and cerebrovascular systems in humans is also expanding and with it comes a growing number of case reports of adverse events associated with energy drinks. The vast majority of studies carried out in the general population report effects on blood pressure and heart rate. However, inconsistencies in the current literature render it difficult to draw firm conclusions with regard to the effects of energy drinks on cardiovascular and cerebrovascular variables...
September 2016: Advances in Nutrition
https://www.readbyqxmd.com/read/27613945/caffeine-concentrations-in-coffee-tea-chocolate-and-energy-drink-flavored-e-liquids
#18
Joseph G Lisko, Grace E Lee, J Brett Kimbrell, Michael E Rybak, Liza Valentin-Blasini, Clifford H Watson
INTRODUCTION: Most electronic cigarettes (e-cigarettes) contain a solution of propylene glycol/glycerin and nicotine, as well as flavors. E-cigarettes and their associated e-liquids are available in numerous flavor varieties. A subset of the flavor varieties include coffee, tea, chocolate, and energy drink, which, in beverage form, are commonly recognized sources of caffeine. Recently, some manufacturers have begun marketing e-liquid products as energy enhancers that contain caffeine as an additive...
July 25, 2016: Nicotine & Tobacco Research: Official Journal of the Society for Research on Nicotine and Tobacco
https://www.readbyqxmd.com/read/27565749/adolescent-intake-of-caffeinated-energy-drinks-does-not-affect-adult-alcohol-consumption-in-c57bl-6-and-balb-c-mice
#19
Meridith T Robins, Julia N DeFriel, Richard M van Rijn
The rise in marketing and mass consumption of energy drink products by adolescents poses a largely unknown risk on adolescent development and drug reward. Yet, with increasing reports of acute health issues present in young adults who ingest large quantities of energy drinks alone or in combination with alcohol, the need to elucidate these potential risks is pressing. Energy drinks contain high levels of caffeine and sucrose; therefore, exposure to energy drinks may lead to changes in drug-related behaviors since caffeine and sucrose consumption activates similar brain pathways engaged by substances of abuse...
August 2016: Alcohol
https://www.readbyqxmd.com/read/27552210/effect-of-caffeine-on-perceived-soreness-and-functionality-following-an-endurance-cycling-event
#20
Aaron R Caldwell, Matthew A Tucker, Cory L Butts, Brendon P McDermott, Jakob L Vingren, Laura J Kunces, Elaine C Lee, Colleen X Munoz, Keith Williamson, Lawrence E Armstrong, Matthew S Ganio
Caffeine can reduce muscle pain during exercise; however the efficacy of caffeine in improving muscle soreness and recovery from a demanding long-duration exercise bout has not been established. The purpose of this study was to investigate the effects of caffeine intake on ratings of perceived muscle soreness (RPMS) and perceived lower extremity functionality (LEF) following the completion of a 164-km endurance cycling event. Prior to and after cycling RPMS (1-to-6; 6=severe soreness) and LEF (0-to-80; 80=full functionality) were assessed via questionnaires...
August 19, 2016: Journal of Strength and Conditioning Research
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