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Approximately 33 documents matched your search.
  1. 3/4/2011 / Caffeine - Not just a stimulant (Review)

    This article reviews the effects of caffeine on a number of different physiological and human performance endpoints. The safety of caffeine was also evaluated. In general, the author came to these conclusions regarding moderate intakes of caffeine: 1) increased energy availability; 2) increased...

  2. 3/4/2011 / Energy-drink consumption in college students and associated factors

    Energy drinks improve attention and/or reaction times during extended periods of cognitive demand. Ingredients of energy drinks, particularly sucrose and caffeine, have unwanted health consequences and can boost heart rate and blood pressure, possibly dehydrate the body, aggravate the effects of...

  3. Ingesting a pre-workout supplement containing caffeine, B-vitamins, amino acids, creatine, and beta-alanine before exercise delays fatigue while improving reaction time and muscular endurance

    Several ergogenic aids (compounds that enhance sports performance) have been identified as effective for most athletes. Among these ingredients are caffeine, creatine, branched chain amino acids (BCAAs), B-vitamins, and beta-alanine.

  4. Effect of caffeine on reactive agility time when fresh and fatigued

    Interpretation of findings/Key practice applications: Although there were no significant interaction effects, small beneficial improvements in RA time were observed after caffeine consumption, regardless of fatigue level. However, results may have been limited by the...

  5. Dietary supplements for improving body composition and reducing body weight: Where is the evidenc

    There is not significance evidence that any weight loss supplement is effective at promoting weight loss and keeping the weight off, but many studies are short (14 wks or less) and do not follow up with participants. A healthy lifestyle including a healthy diet and exercise is recommended for...

  6. Skill execution and sleep deprivation: effects of acute caffeine or creatine supplementation – a randomized placebo-controlled trial

    Sleep deprivation can cause a lack of energy and cognitive performance, thereby impacting the ability to perform skills that require high coordination and/or focus. Caffeine has been established to be able to partly compensate for sleep deprivation in regards to physical performance. Recently,...

  7. Effect of a pre-workout energy supplement on acute multi-joint resistance exercise

    The participants were able to perform more repetitions in 4 sets with the supplement (26.3 ± 9.2) than with the placebo (23.5 ± 9.4 repetitions; p = 0.022). The supplement improved the performance for 6 of the 8 participants.

  8. Effect of caffeine ingestion after creatine supplementation on intermittent high-intensity sprint performance

    Creatine has repeated shown to increase work volume during exercise. However, more impressively, creatine has also shown many long term benefits such as increased rates of gain in muscle mass, strength, and power. A study that lasts for a longer term, for example 8 wks instead of 5 days, may be...

  9. 3/4/2011 / Effect of two doses of caffeine on muscular function during isokinetic exercise

    The study examined the effects of 2 doses of caffeine on peak/average torque, power output, and total work of the knee extensors and flexors during 2 bouts of high-intensity exercise. The authors hypothesized that acute caffeine intake would have an effect on muscular performance versus placebo.

  10. Effects of caffeine on time trial performance in sedentary men

    In men who don’t typically exercise, caffeine ingestion increased the amount of work performed by during a 30 min, self-paced exercise session without increasing their perceived exertion. This is important because it may increase the rate at which overweight men lose weight, and therefore...

  11. 3/4/2011 /The effect of caffeine ingestion on mood state and bench press performance to failure

    Caffeine ingestion enhances performance and reduces ratings of perceived exertion (RPE) in submaximal aerobic endurance events. Caffeine has also been suggested to improve performance in high-intensity exercise, although results of several studies examining short-term resistance exercise, such as...

  12. The Effects of Low-Dose Caffeine on Perceived Pain During a Grip to Exhaustion Task

    Caffeine is widely consumed among non-athletes and athletes alike. Primary effects include a release of catecholamines and glucocorticoids into the central nervous system, which elevates circulation and blood pressure. Caffeine has been shown to increase running and cycling time to exhaustion,...

  13. The effect of adding caffeine to postexercise carbohydrate feeding on subsequent high-intensity interval-running capacity compared with carbohydrate alone

    Twice-daily training with morning and afternoon sessions separated by a 3- to 6-hour recovery period is a commonly used schedule for various sports. To maintain training intensity in the later sessions, it is necessary to promote maximal rates of muscle glycogen resynthesis. While carbohydrate...

  14. 3/4/2011 / Effect of two doses of caffeine on muscular function during isokinetic exercise

    Caffeine has consistent ergogenic effects in high-intensity aerobic activities such as swimming, cycling, and exercising to exhaustion, but only approximately 60% of studies show caffeine to be beneficial in activities involving anaerobic power

  15. 3/4/2011 / Caffeine consumption and incident atrial fibrillation in women

    It is somewhat controversial whether or not caffeine consumption is associated with an increased risk of developing atrial fibrillation (AF). Although many patients with AF indicate coffee as a trigger for arrhythmia, and although there is a widespread belief that caffeine intake is related to the...

  16. 3/4/2011 / Effect of two doses of caffeine on muscular function during isokinetic exercise

    Caffeine has consistent ergogenic effects in high-intensity aerobic activities such as swimming, cycling, and exercising to exhaustion, but only approximately 60% of studies show caffeine to be beneficial in activities involving anaerobic power.

  17. 3/4/2011 /The effects of acute and prolonged CRAM supplementation on reaction time and subjective measures of focus and alertness in healthy college students

     Phosphatidylcholine is a cellular membrane phospholipid that is necessary for both structural integrity as well as physiologic functions. Choline is also essential in the production of the neurotransmitter acetylcholine and has a potential role in neuromuscular signaling, which could produce...

  18. 3/4/2011 /Physiological effects of caffeine, epigallocatechin-3-gallate, and exercise in overweight and obese women

     Obesity is the result of a positive energy balance and contributes to more than 300,000 deaths per year. Recent research has been particularly focused on the use of plant compounds (ie, caffeine, green tea), with a principal aim of reducing food intake and/or increasing energy expenditure....

  19. The effect of caffeine ingestion on mood state and bench press performance to failure

    Caffeine ingestion enhances performance and reduces ratings of perceived exertion (RPE) in submaximal aerobic endurance events. Caffeine has also been suggested to improve performance in high-intensity exercise, although results of several studies examining short-term resistance exercise, such as...

  20. Caffeine withdrawal and high-intensity endurance cycling performance

    Caffeine is the most widely used ergogenic aid in the world. As tolerance and dependence of caffeine is easily (and commonly) built up, withdrawal from caffeine may have significant, deleterious effects on performance. It is unknown whether withdrawal from caffeine for 4 days before an event is...

  21. BJSM reviews: A-Z of nutritional supplements: dietary supplements, sports nutrition foods and ergogenic aids for health and performance. Part 17

    When consuming or studying herbal supplements, one must remember that bioactive compounds can vary drastically with the growing conditions of the plant. At this point, concentrations of bioactives are not regulated in most herbal supplements and one cannot rely on uniformity from one batch to the...

  22. Effect of a high and low dose of caffeine on antigen-stimulated activation of human natural killer cells after prolonged cycling

    Many athletes consume caffeine for its known ergogenic effects, which have been demonstrated with doses as low as 2 mg/kg body mass (~150 to 200 mg). Natural killer (NK) cells are part of the innate immune system and represent the “first line of defense” against viral infections and...

  23. Prevalence of caffeine use in elite athletes following its removal from the World Anti-Doping Agency list of banned substances

    Interpretation of findings/Key practice applications: Although caffeine is no longer prohibited by WADA, it appears that caffeine use did not increase. Men and women have similar caffeine usage (per kg body weight), but older athletes have a higher usage than younger athletes....

  24. Effect of endurance training supplemented with green tea extract on substrate metabolism during exercise in humans

    Limitations:  The authors suggest that an increase in exercise with GTE supplementation increases the rate of fat burning, which in turn can promote weight loss.  The increase in aerobic capacity of the subjects during the supplementation period implies that the...

  25. Black tea is not significantly different from water in the maintenance of normal hydration in human subjects: results from a randomized controlled trial

    Normal tea consumption probably does not cause dehydration. British nutritional advisory committees recommend consuming extra water when consuming caffeinated beverages, but this practice may not be warranted.

  26. Induced alkalosis and caffeine supplementation: effects on 2,000-m rowing performance

    The 2,000-m rowing event requires very high intensity for about 6-8 min. Sodium bicarbonate (SB, baking soda) is a popular ergogenic aid because it can increase the concentration of bicarbonate in the blood, thus providing a larger buffering capacity against acid buildup and maintaining a healthy...

  27. 5/3/2012 / Effects of carbohydrates-BCAAs-caffeine ingestion on performance and neuromuscular function during a 2-h treadmill run: a randomized, double-blind, cross-over placebo-controlled study

    A sports beverage with caffeine, carbohydrates, and BCAAs enhanced endurance performance compared to a beverage with very little calories. This is in part due to preservation of neuromuscular function (delaying fatigue) and providing a constant supply of available energy.

  28. Low-dose caffeine administered in chewing gum does not enhance cycling to exhaustion

    Caffeine has been shown to increase performance, especially with moderate to high doses of about 3 or 4 to 13 mg/kg body weight (about 250-1000 mg/serving). However, it is unknown if a low dose of caffeine (200 mg or 2-3 mg/kg body weight) will have similar positive effects when administered in...

  29. Dose response effects of a caffeine-containing energy drink on muscle performance: a repeated measures design

    he effects of caffeine can vary greatly between different individuals, resulting in either positive or negative outcomes. It is easy to build a tolerance to caffeine, so frequent caffeine consumers may require more caffeine to elicit performance benefits. As always, try supplements in practice...

  30. Acute caffeine ingestion’s increase of voluntarily chosen resistance-training load after limited sleep

    It would have been interesting if the authors followed up with the participants to see how exercising in a sleep-deprived state affected their physical health, mental capabilities, sleep requirements, and exercise capacity for the rest of the day and several days following the workout. Working out...

  31. A-Z of nutritional supplements: dietary supplements, sports nutrition foods and ergogenic aids for health and performance- Part 37

    Athletes who consume supplements and functional foods tend to combine ingredients, either intentionally or unintentionally.  It is important for athletes to be aware of what they are combining to prevent negative interactions and overdoses, as well as to increase the effects of their...

  32. Effects of caffeine on session ratings of perceived exertion

    Effects of caffeine on session ratings of perceived exertion: Read a study detailing whether caffeine changes the perception of how much exertion occurs during exercise.

  33. Contemporary Sports Nutrition Abstracts and Articles

    On this page, you will find helpful sports nutrition articles and abstracts culled from 47 nutrition and exercise journals from July 2015.
    The articles below were selected only if they included research in humans, although exceptions were made for particularly interesting and...

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