Caffeine Teams ((BETTER)) Download

If you have problems with your PC locking or going to sleep, caffeine will keep it awake. It works by simulating a keypress once every 59 seconds, so your machine thinks you're still working at the keyboard, so won't lock the screen or activate the screensaver.

The aim of this investigation was to perform a systematic review and meta-analysis to determine the efficacy of the acute ingestion of caffeine (from 3 to 6 mg/kg) to increase performance on variables related to team sports. A systematic review was performed in scientific databases from January to April 2018. All studies included had cross-over experimental designs comparing caffeine to an identical placebo condition. A meta-analysis was performed using the random effects model and pooled standardized mean differences (Glass's ). Thirty-four studies published between 2001 and 2018 were included in the analysis. The meta-analysis revealed that caffeine increased single (;95% confidence intervals = 0.19;0.14-0.25; p < 0.01) and repeated jump height (0.29;0.16-0.42; p < 0.01), single (0.16;0.02-0.30; p = 0.03) and repeated sprint velocity (0.14;0.03-0.25; p = 0.02), and reduced the time to complete agility tests (0.41;0.04-0.77; p = 0.03). During team sport matches, caffeine increased total running distance (0.41;0.20-0.62; p < 0.01), distance covered at sprint velocity (0.36;0.12-0.59; p < 0.01) and the number of sprints (0.44;0.18-0.69; p < 0.01). The acute ingestion of a moderate dose of caffeine had a small but significant positive effect on several aspects related to physical performance in team sports.

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Purpose: Caffeine can be a powerful ergogenic aid for the performance of prolonged, submaximal exercise. Little evidence, however, supports an ergogenic effect of caffeine on intermittent-sprint performance. Hence, this study was conducted to examine the effects of acute caffeine ingestion on prolonged intermittent-sprint performance.

Methods: Using a double-blind, placebo-controlled design, 10 male team-sport athletes (amateur level, VO2peak 56.5 +/- 8.0 mL x kg(-1) x min(-1)) completed two exercise trials, separated by 7 d, 60 min after ingestion of either 6 mg x kg(-1) caffeine or placebo. The exercise trial was performed on a front-access cycle ergometer and consisted of 2 x 36-min halves, each composed of 18 x 4-s sprints with 2-min active recovery at 35% VO2peak between each sprint. Urinary caffeine levels were measured after exercise.

Results: The total amount of sprint work performed during the caffeine trial was 8.5% greater than that performed during the placebo trial in the first half (75,165.4 +/- 3,902.9 vs 69,265.6 +/- 3,719.7 J, P < 0.05), and was 7.6% greater in the second half (73,978.7 +/- 4,092.6 vs 68,783.2 +/- 3,574.4 J, P < 0.05). Similarly, the mean peak power score achieved during sprints in the caffeine trial was 7.0% greater than that achieved during the placebo trial in the first half (1330.9 +/- 68.2 vs 1244.2 +/- 60.7 W, P < 0.05), and was 6.6% greater in the second half (1314.5 +/- 68.4 vs 1233.2 +/- 59.9 W, P < 0.05). Urinary caffeine levels following the caffeine trial ranged from 3.5 to 9.1 microg x mL(-1) (6.9 +/- 0.6 microg x mL(-1)).

WHEN IT COMES to the toll of travel, the NBA is in a league all its own. NBA teams, according to ESPN Stats & Information's Vincent Johnson, average 43,534 miles per season, nearly 7 percent more than NHL teams (40,768 miles), 36 percent more than MLB teams (31,993) and 441 percent more than NFL teams (8,049). And over the past 10 full seasons across the four major North American pro sports, no team has traveled as far as the Trail Blazers.

It caught on -- fast. Staffers of opposing teams caught wind of the coffee and began contriving reasons to visit the Lakers locker room to grab a cup. Luke Walton, during his first preseason game as Lakers head coach, declared: "We have French press coffee here? Oh, my god. This is amazing." Soon, making coffee became the very first task Lakers staffers did upon entering an opposing arena, roughly five hours before tip. DiFrancesco and an assistant were brewing three batches before games.

The battle against fatigue is Sisyphean -- not to be won so much as played to a draw. How each team fights it varies, but to walk into any NBA locker room before a game is to find energy shots in players' lockers, Red Bulls in nearby fridges -- a caffeine infusion always within reach. And despite that potpourri of options on the market, several experts say they'd recommend a cup of joe to weary-eyed NBA players.

"At a pure nutritional level, if you wanted to get more caffeine," says Ben Desbrow, a professor of nutrition and dietetics at the School of Allied Health Sciences in Griffith University in Australia who has been studying caffeine for the past two decades, "you'd be better off to drink more coffee."

"The half-life of caffeine is five to seven hours," says Brian St. Pierre, director of performance nutrition at Precision Nutrition. "It hangs around a long time. This is one of the issues with taking a large dose of caffeine. You might want to use it for an hour of competition, but then you've got residual effects in your system for five, six hours after."

In team-sport athletes (TSA), the efficacy of caffeine supplementation in enhancing performance is less clear than in other sport disciplines, because success is explained by a combination of physical, technical and tactical skills. Brown et al. suggested via a meta-analysis that caffeine had no effect on repeated sprint ability (RSA) in TSA [7]. These results were contradicted by a review performed by Chia et al. [8], who found improvements in sprint performance (in 8 out of 10 studies) and vertical jump (in 7 out of 8 studies) in ball game athletes. These findings were reaffirmed by a later meta-analysis developed by Salinero et al. [9] evaluating TSA and also by a systematic review developed by Mielgo-Ayuso et al. [10] focusing on soccer players. Both studies concluded that acute caffeine ingestion improved jump height and RSA [9,10] in addition to agility performance, total running distance and number of performed sprints during a match [9]. Nonetheless, Ferreira and colleagues [11] recently performed a meta-analysis focusing on the effects of caffeine on soccer, finding no significant improvements in soccer-related performance following caffeine supplementation. Therefore, although the positive effects that caffeine supplementation may have on athletic performance in certain individual sports (e.g., running, cycling, etc.) are evident, it seems that more research is needed to determine the ergogenic effect of acute caffeine intake in team sports.

Despite the lack of research specifically analyzing female athletes, current guidelines for caffeine supplementation are identically applied for both males and females [15]. However, these guidelines were established primarily from studies developed in males, which is a clear limitation and raises concerns about their practicality. Although recent evidence suggests that the pharmacokinetics of acute caffeine intake seems to be similar in all phases of the menstrual cycle and that women athletes benefit from caffeine intake across all phases of the menstrual cycle [16], it is still possible that women obtain lower ergogenic effects of oral caffeine intake due to the interaction of caffeine and female sex hormones [17]. Along these lines, Temple and Ziegler [18] found sex differences in subjective and physiological responses to caffeine that were mediated by changes in circulating steroid hormones. In fact, inconsistent results have been found when comparing the ergogenic effects of caffeine in both sexes, with some studies finding some differences [19] while others found none [20,21]. Moreover, some researchers have concluded that the ergogenic effect of oral caffeine intake is present in both sexes but differs in its magnitude [22]. Along these lines, Mielgo-Ayuso et al. [10] recently developed a systematic review including 10 studies that evaluated the ergogenic effect of caffeine on both males and females. These authors concluded that caffeine supplementation produced a similar ergogenic benefit regarding aerobic performance and fatigue index in men and women, finding larger effects of caffeine intake in men when anaerobic performance was evaluated, which could be critical for team sports. However, the above-mentioned review only focused on the sex comparison; consequently, many studies that only recruited females were excluded, and due to the low number of included studies the authors chose not to perform a meta-analysis.

A sensitivity analysis was performed excluding those studies that administered less than 2 mg of caffeine per kg of body mass [33,40,41] as this has been suggested to be the minimum effective ergogenic dose [17].

Regarding caffeine withdrawal as part of the standardization procedures, although different instructions to volunteers were found among the studies (Specified in Table 1), most studies required participants to abstain from all dietary sources of caffeine for 48 h before the trials.

(A): Effects of caffeine on body impacts during a simulated match. (B): Effects of caffeine on specific skills. (C): Effects of caffeine on countermovement jump. (D): Effects of caffeine on squat jump.

(A): Effects of caffeine on single sprint performance. (B): Effects of caffeine on repeated sprint ability performance. (C): Effects of caffeine on rate of perceived exertion.

The positive effects of caffeine supplementation on CMJ are in accordance with most of the previous systematic reviews and meta-analyses developed for team sports [8,9,10], although Ferreira and colleagues [11] did not find a positive effect of caffeine in their meta-analysis including male soccer players. Nonetheless, we also found that caffeine had no effect on SJ performance. This could partially be explained by the low number of studies (n = 3) evaluating the effect of caffeine on SJ performance. When considering Figure 2D, it appears that caffeine had a positive effect in the three studies, although the overall effect was not significant probably due to the low number of studies. ff782bc1db