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Caffeine ingestion

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https://www.readbyqxmd.com/read/29738282/caffeine-ingestion-changes-time-motion-and-technical-tactical-aspects-in-simulated-boxing-matches-a-randomized-double-blind-pla-controlled-crossover-study
#1
Victor Silveira Coswig, Paulo Gentil, Francine Irigon, Fabrício Boscolo Del Vecchio
The number of offensive actions and glycolytic energy in combat sports both increase with caffeine (CAF) ingestion. In addition, the effects of CAF on technical-tactical and time-motion analysis and physiological parameters in boxing are unknown. This study aimed to investigate the effects of CAF ingestion on physiological parameters and the notational analysis of boxing matches. Ten male boxers were recruited; the participants ingested 6 mg kg-1 BM of CAF or placebo (PLA) 30 min prior to the match in a crossover design...
May 8, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29727404/effects-of-p-synephrine-and-caffeine-ingestion-on-substrate-oxidation-during-exercise
#2
Jorge Gutiérrez-Hellín, Juan Del Coso
PURPOSE: Caffeine and p-synephrine are substances usually included in commercially-available products for weight loss because of their purported thermogenic effects. However, scientific information is lacking about the effects of combining these substances on substrate oxidation during exercise. The purpose of this investigation was to determine the isolated and combined effects of p-synephrine and caffeine on fat oxidation rate during exercise. METHODS: In a double-blind randomized experiment, 13 healthy subjects participated in 4 experimental trials after the ingestion of a capsule containing either a placebo, 3 mg·kg of caffeine, 3 mg·kg of p-synephrine, or the combination of these doses of caffeine and p-synephrine...
April 27, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29681860/cardiovascular-and-metabolic-responses-to-the-ingestion-of-caffeinated-herbal-tea-drink-it-hot-or-cold
#3
Claire Maufrais, Delphine Sarafian, Abdul Dulloo, Jean-Pierre Montani
Aim: Tea is usually consumed at two temperatures (as hot tea or as iced tea). However, the importance of drink temperature on the cardiovascular system and on metabolism has not been thoroughly investigated. The purpose of this study was to compare the cardiovascular, metabolic and cutaneous responses to the ingestion of caffeinated herbal tea (Yerba Mate) at cold or hot temperature in healthy young subjects. We hypothesized that ingestion of cold tea induces a higher increase in energy expenditure than hot tea without eliciting any negative effects on the cardiovascular system...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29668752/the-cyp1a2-163c-a-polymorphism-does-not-alter-the-effects-of-caffeine-on-basketball-performance
#4
Carlos Puente, Javier Abián-Vicén, Juan Del Coso, Beatriz Lara, Juan José Salinero
PURPOSE: The aim of this investigation was to analyze the influence of the genetic variations of the -163C>A polymorphism of the CYP1A2 gene on the ergogenic effects of caffeine in elite basketball players. METHODS: Nineteen elite basketball players (10 men and 9 women) ingested 3 mg⋅kg-1 of caffeine or a placebo 60 min before performing 10 repetitions of the following series: the Abalakov jump test followed by the Change-of-Direction and Acceleration Test (CODAT)...
2018: PloS One
https://www.readbyqxmd.com/read/29589768/ioc-consensus-statement-dietary-supplements-and-the-high-performance-athlete
#5
Ronald J Maughan, Louise M Burke, Jiri Dvorak, D Enette Larson-Meyer, Peter Peeling, Stuart M Phillips, Eric S Rawson, Neil P Walsh, Ina Garthe, Hans Geyer, Romain Meeusen, Luc van Loon, Susan M Shirreffs, Lawrence L Spriet, Mark Stuart, Alan Vernec, Kevin Currell, Vidya M Ali, Richard G M Budgett, Arne Ljungqvist, Margo Mountjoy, Yannis Pitsiladis, Torbjørn Soligard, Uğur Erdener, Lars Engebretsen
Nutrition usually makes a small but potentially valuable contribution to successful performance in elite athletes, and dietary supplements can make a minor contribution to this nutrition program. Nonetheless, supplement use is widespread at all levels of sport. Products described as supplements target different issues, including the management of micronutrient deficiencies, supply of convenient forms of energy and macronutrients, and provision of direct benefits to performance or indirect benefits such as supporting intense training regimens...
March 28, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29574606/effectiveness-of-psycho-physiological-portable-devices-to-analyse-effect-of-ergogenic-aids-in-military-population
#6
Montaña Diaz-Manzano, José Juan Robles-Pérez, Ketty Herrera-Mendoza, Beliña Herrera-Tapias, Jesús Fernández-Lucas, Susana Aznar-Lain, Vicente Javier Clemente-Suárez
Caffeine is one of the ergogenic substances most used by warfighters in current operation areas, but the effect on the organic response and operational performed is already poor knowledge. This research aimed to study the acute effect of 400 mg of caffeine monohydrate on the psycho-physiological response and rifle marksmanship of warfighters during a close quarter combat simulation. We analysed parameter of heart rate, blood lactate, cortical arousal, state anxiety and marksmanship of 20 Spanish Army veteran warfighters before and after a close quarter combat simulation in a double-blind procedure, also a correlation analysis was conducted between all the study variables...
March 24, 2018: Journal of Medical Systems
https://www.readbyqxmd.com/read/29540367/ioc-consensus-statement-dietary-supplements-and-the-high-performance-athlete
#7
Ronald J Maughan, Louise M Burke, Jiri Dvorak, D Enette Larson-Meyer, Peter Peeling, Stuart M Phillips, Eric S Rawson, Neil P Walsh, Ina Garthe, Hans Geyer, Romain Meeusen, Lucas J C van Loon, Susan M Shirreffs, Lawrence L Spriet, Mark Stuart, Alan Vernec, Kevin Currell, Vidya M Ali, Richard Gm Budgett, Arne Ljungqvist, Margo Mountjoy, Yannis P Pitsiladis, Torbjørn Soligard, Uğur Erdener, Lars Engebretsen
Nutrition usually makes a small but potentially valuable contribution to successful performance in elite athletes, and dietary supplements can make a minor contribution to this nutrition programme. Nonetheless, supplement use is widespread at all levels of sport. Products described as supplements target different issues, including (1) the management of micronutrient deficiencies, (2) supply of convenient forms of energy and macronutrients, and (3) provision of direct benefits to performance or (4) indirect benefits such as supporting intense training regimens...
April 2018: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/29532291/the-effect-of-cyp1a2-genotype-on-the-ergogenic-properties-of-caffeine-during-resistance-exercise-a-randomized-double-blind-placebo-controlled-crossover-study
#8
Rahman Rahimi
AIM: The purpose of this study was to examine the effect of CYP1A2 -163C>A polymorphism on the ergogenic effects of caffeine supplementation during a resistance exercise (RE) session. METHODS: In a randomized, double-blind, placebo (PL)-controlled, crossover study, 30 resistance-trained men took part in two RE sessions (three sets to failure at 85% of one repetition maximum, 2-min rest between sets), including bench press (BP), leg press (LP), seated cable row, and shoulder press (SP) following caffeine (CAF) (6 mg kg-1 ) or PL (6 mg kg-1 of maltodextrin) ingestion 1 h prior to the trial...
March 12, 2018: Irish Journal of Medical Science
https://www.readbyqxmd.com/read/29527137/effects-of-caffeine-intake-on-muscle-strength-and-power-a-systematic-review-and-meta-analysis
#9
REVIEW
Jozo Grgic, Eric T Trexler, Bruno Lazinica, Zeljko Pedisic
Background: Caffeine is commonly used as an ergogenic aid. Literature about the effects of caffeine ingestion on muscle strength and power is equivocal. The aim of this systematic review and meta-analysis was to summarize results from individual studies on the effects of caffeine intake on muscle strength and power. Methods: A search through eight databases was performed to find studies on the effects of caffeine on: (i) maximal muscle strength measured using 1 repetition maximum tests; and (ii) muscle power assessed by tests of vertical jump...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29526946/a-retrospective-study-on-the-epidemiological-and-clinical-features-of-emergency-patients-with-large-or-massive-consumption-of-caffeinated-supplements-or-energy-drinks-in-japan
#10
Yoshito Kamijo, Michiko Takai, Yuji Fujita, Kiyotaka Usui
Objective We conducted a retrospective study on the epidemiological and clinical features of patients with acute caffeine poisoning in Japan. Methods Letters requesting participation were sent to 264 emergency departments of hospitals, and questionnaires were mailed to those that agreed to participate. Patients Participants were patients transported to emergency departments of hospitals between April 2011 and March 2016 after consuming large or massive amounts of caffeinated supplements and/or energy drinks (caffeine dose ≥1...
March 9, 2018: Internal Medicine
https://www.readbyqxmd.com/read/29522901/the-influence-of-cyp1a2-genotype-in-the-blood-pressure-response-to-caffeine-ingestion-is-affected-by-physical-activity-status-and-caffeine-consumption-level
#11
Rogerio Nogueira Soares, Augusto Schneider, Sandra Costa Valle, Paulo Cavalheiro Schenkel
This study aimed to investigate whether the influence of CYP1A2 genotype in the blood pressure (BP) response to caffeine ingestion was affected by physical activity status and habitual caffeine consumption. Thirty-seven participants (19-50 years old) took place in the study and were categorized according to i) genotype: CYP1A2 (AA) "fast metabolizer", and CYP1A2 (AC) "slow metabolizer"; ii) physical activity level: sedentary (S) and physically active (A); and iii) caffeine consumption level: non-habitual caffeine consumer (NC) and habitual heavy caffeine consumer (C)...
March 6, 2018: Vascular Pharmacology
https://www.readbyqxmd.com/read/29514871/interindividual-differences-in-caffeine-metabolism-and-factors-driving-caffeine-consumption
#12
REVIEW
Astrid Nehlig
Most individuals adjust their caffeine intake according to the objective and subjective effects induced by the methylxanthine. However, to reach the desired effects, the quantity of caffeine consumed varies largely among individuals. It has been known for decades that the metabolism, clearance, and pharmacokinetics of caffeine is affected by many factors such as age, sex and hormones, liver disease, obesity, smoking, and diet. Caffeine also interacts with many medications. All these factors will be reviewed in the present document and discussed in light of the most recent data concerning the genetic variability affecting caffeine levels and effects at the pharmacokinetic and pharmacodynamic levels that both critically drive the level of caffeine consumption...
April 2018: Pharmacological Reviews
https://www.readbyqxmd.com/read/29484298/improved-exercise-tolerance-with-caffeine-is-associated-with-modulation-of-both-peripheral-and-central-neural-processes-in-human-participants
#13
Joanna L Bowtell, Magni Mohr, Jonathan Fulford, Sarah R Jackman, Georgios Ermidis, Peter Krustrup, Katya N Mileva
Background: Caffeine has been shown to enhance exercise performance and capacity. The mechanisms remain unclear but are suggested to relate to adenosine receptor antagonism, resulting in increased central motor drive, reduced perception of effort, and altered peripheral processes such as enhanced calcium handling and extracellular potassium regulation. Our aims were to investigate how caffeine (i) affects knee extensor PCr kinetics and pH during repeated sets of single-leg knee extensor exercise to task failure and (ii) modulates the interplay between central and peripheral neural processes...
2018: Frontiers in Nutrition
https://www.readbyqxmd.com/read/29470151/caffeine-increases-both-total-work-performed-above-critical-power-and-peripheral-fatigue-during-a-4-km-cycling-time-trial
#14
Leandro Camati Felippe, Guilherme Assuncao Ferreira, Sara Kely Learsi, Daniel Boari, Rômulo Bertuzzi, Adriano Eduardo Lima-Silva
The link between total work performed above critical power (CP) and peripheral muscle fatigue during self-paced exercise is unknown. We investigated the influence of caffeine on the total work done above CP during a 4-km cycling time trial (TT), and the subsequent consequence on the development of central and peripheral fatigue. Nine cyclists performed three constant-load exercise trials to determine CP and two 4-km TT ~75 min after oral caffeine (5 mg·kg-1 ) or cellulose (placebo) ingestion. Neuromuscular functions were assessed before and 50 min after supplementation, and 1 min after TT...
February 22, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29444414/no-individual-or-combined-effects-of-caffeine-and-beetroot-juice-supplementation-during-submaximal-or-maximal-running
#15
Johanna Oskarsson, Kerry McGawley
BACKGROUND: Dietary supplements such as caffeine and beetroot juice are used by athletes in an attempt to optimize performance and therefore gain an advantage in competition. AIM: To investigate the individual and combined effects of caffeine and beetroot-juice supplementation during submaximal and maximal treadmill running. METHODS: Seven males (VO<sub>2max</sub>: 59.0 ± 2.9 mL/kg/min) and two females (VO<sub>2max</sub>: 53...
February 14, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29431593/caffeine-use-in-a-super-rugby-game-and-its-relationship-to-post-game-sleep
#16
Ian C Dunican, Charles C Higgins, Maddison J Jones, Michael W Clarke, Kevin Murray, Brian Dawson, John A Caldwell, Shona L Halson, Peter R Eastwood
OBJECTIVE: To examine the relationship between regular game-related caffeine consumption on sleep after an evening Super Rugby game. METHODS: Twenty elite rugby union players wore a wrist-activity monitor to measure sleep for three days before, three days after and on the night of an evening Super Rugby game (19:00-21:00). Players ingested caffeine as they would normally (i.e. before and sometimes during a game) and saliva samples were collected before (17:00) and after (21:30) the game for caffeine concentration...
February 12, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29426918/caffeine-caused-a-widespread-increase-of-resting-brain-entropy
#17
Da Chang, Donghui Song, Jian Zhang, Yuanqi Shang, Qiu Ge, Ze Wang
Entropy is an important trait of brain function and high entropy indicates high information processing capacity. We recently demonstrated that brain entropy (BEN) is stable across time and differs between controls and patients with various brain disorders. The purpose of this study was to examine whether BEN is sensitive to pharmaceutical modulations with caffeine. Both cerebral blood flow (CBF) and resting fMRI were collected from sixty caffeine-naïve healthy subjects before and after taking a 200 mg caffeine pill...
February 9, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29422383/inadequate-sleep-and-muscle-strength-implications-for-resistance-training
#18
REVIEW
Olivia E Knowles, Eric J Drinkwater, Charles S Urwin, Séverine Lamon, Brad Aisbett
OBJECTIVES: Inadequate sleep (e.g., an insufficient duration of sleep per night) can reduce physical performance and has been linked to adverse metabolic health outcomes. Resistance exercise is an effective means to maintain and improve physical capacity and metabolic health, however, the outcomes for populations who may perform resistance exercise during periods of inadequate sleep are unknown. The primary aim of this systematic review was to evaluate the effect of sleep deprivation (i...
February 2, 2018: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29345161/caffeine-improves-triathlon-performance-a-field-study-in-males-and-females
#19
Sunita Potgieter, Hattie H Wright, Carine Smith
The ergogenic effect of caffeine on endurance exercise is commonly accepted. We aimed to elucidate realistically the effect of caffeine on triathlon event performance using a field study design, while allowing investigation into potential mechanisms at play. A double-blind, randomized, crossover, field trial was conducted. Twenty-six triathletes (14 males, 12 females) participated (age: 37.8±10.6 years, habitual caffeine intake: 413±505 mg/day, percentage body fat: 14.5±7.2%, training/week: 12.8±4.5 hours)...
January 18, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29337831/acute-effects-of-a-caffeine-containing-supplement-on-anaerobic-power-and-subjective-measurements-of-fatigue-in-recreationally-active-men
#20
Chelsea J Hahn, Andrew R Jagim, Clayton L Camic, Matthew J Andre
Hahn, CJ, Jagim, AR, Camic, CL, and Andre, MJ. Acute effects of a caffeine-containing supplement on anaerobic power and subjective measurements of fatigue in recreationally active men. J Strength Cond Res 32(4): 1029-1035, 2018-Studies show mixed results for the effects of caffeine on performance, warranting further investigation. The purpose of this study was to examine the acute effects of a caffeine-containing supplement on anaerobic power and subjective measurements of fatigue during resisted sprinting on men...
April 2018: Journal of Strength and Conditioning Research
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