Caffeine for Sports Performance

Burke, Louise M.; Desbrow, Ben; Spriet, Lawrence L.

doi:10.5040/9781492595311

Cited by 60 publications

(81 citation statements)

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“…PWS are promoted to active individuals for their ergogenic (eg, to reduce fatigue, improve strength) potential. The ergogenic capacity of caffeine has been well described with acute doses of between 200 and 400 mg (∼3 to 6 mg·kg −1 of body mass) being beneficial across a spectrum of exercise modalities . The current analysis indicates that 7 of the 15 products tested would supply an ergogenic quantity of caffeine within one average serve of product (without considering the consumption of other dietary caffeine sources).…”

Section: Discussionmentioning

confidence: 99%

Caffeine content of pre‐workout supplements commonly used by Australian consumers

Desbrow

Hall

O’Connor

et al. 2018

Drug Testing and Analysis

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The stimulant properties of caffeine are often promoted in pre-workout supplements (PWS) to assist with training, reduce the perception of fatigue, and for some brands, assist body fat loss. While manufacturers of PWS often indicate the inclusion of significant amounts of caffeine, no independent verification of the caffeine content of these products exists. The aim of this investigation was to independently assess the caffeine content of popular PWS in Australia and compare these values to nutrition information panel data. Fifteen PWS were tested for their caffeine content (both within and between batches of the same product). The caffeine content of selected PWS ranged from 91 to 387 mg·serve . Only 6 of the 15 PWS nutrition information panels included details on caffeine content. The percent of caffeine present ranged from 59% to 176% of packaging claims. All but one PWS contained a variation of caffeine within and between batches that was considered "practically" significant (ie, ≥40 mg·serve variation). Consumers are likely to be exposed to large and variable caffeine doses if ingesting PWS. Product information panels do little to improve consumer awareness of likely caffeine intakes.

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Section: Discussionmentioning

confidence: 99%

Caffeine content of pre‐workout supplements commonly used by Australian consumers

Desbrow

Hall

O’Connor

et al. 2018

Drug Testing and Analysis

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“…There is also evidence that caffeine is more potent when it is used as an acute supplement in endurance‐based activities, while results from studies showing its effects on short‐term high‐intensity exercise protocols appear to be more ambiguous (Graham, ; Davis and Green, ; Goldstein et al ., ). The effect of caffeine ingestion on sports performance has been extensively explored in a number of reviews (Graham, ; Burke, ; Davis and Green, ; Astorino and Roberson, ; Goldstein et al ., ).…”

Section: Caffeine and Sports Performancementioning

confidence: 99%

“…() reported faster swim speeds in trained athletes following a 250 mg caffeine dose that were not replicated in an untrained group. The mechanism responsible for these different responses is largely unknown, but it is thought that as many experimental procedures require participants to work maximally, trained individuals will have greater motivation to perform taxing exercise and will have better nutritional preparation, and their day‐to‐day performance variation will be reduced (Burke, ).…”

Section: Caffeine and Sports Performancementioning

confidence: 99%

What can isolated skeletal muscle experiments tell us about the effects of caffeine on exercise performance?

Tallis

Duncan

James

2015

British J Pharmacology

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Caffeine is an increasingly popular nutritional supplement due to the legal, significant improvements in sporting performance that it has been documented to elicit, with minimal side effects. Therefore, the effects of caffeine on human performance continue to be a popular area of research as we strive to improve our understanding of this drug and make more precise recommendations for its use in sport. Although variations in exercise intensity seems to affect its ergogenic benefits, it is largely thought that caffeine can induce significant improvements in endurance, power and strength-based activities. There are a number of limitations to testing caffeine-induced effects on human performance that can be better controlled when investigating its effects on isolated muscles under in vitro conditions. The hydrophobic nature of caffeine results in a post-digestion distribution to all tissues of the body making it difficult to accurately quantify its key mechanism of action. This review considers the contribution of evidence from isolated muscle studies to our understating of the direct effects of caffeine on muscle during human performance. The body of in vitro evidence presented suggests that caffeine can directly potentiate skeletal muscle force, work and power, which may be important contributors to the performance-enhancing effects seen in humans. Abbreviations

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“…Caffeine can stimulate calcium release from the sarcoplasmic reticulum [22] and can also inhibit its reuptake [23]. Numerous studies have discussed the effects of caffeine intake on human physical fitness [24][25][26][27][28][29][30]. However, in regards to strength and power performance, the results of caffeine supplementation are ambiguous.…”

Section: Introductionmentioning

confidence: 99%

The acute effects of caffeine intake on time under tension and power generated during the bench press movement

Wilk

Krzysztofik

Maszczyk

et al. 2019

Journal of the International Society of Sports Nutrition

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Background: The ability to generate high levels of power is one of the key factors determining success in many sport disciplines. Although there are studies confirming ergogenic effects of caffeine (CAF) on different physical and mental abilities, much controversy remains about its influence on power. The main goal of this study was to assess the effects of caffeine supplementation on time under tension (TUT) and the number of performed repetitions (REP). The second objective was to determine the effects of CAF supplementation on power (P) and movement velocity (V) during the bench press movement. Additionally the authors evaluated whether CAF has a significant effect on velocity of the bar in the eccentric (ECC) phase (VE MEAN ) of the bench press movement. Methods: The study included 20 men (20-31 yrs., 87.3 ± 7.7 kg) with at least 2 years of experience in resistance training. The study participants were divided randomly into two groups: the supplemented group ingested caffeine before exercise (G CAF ), while the control group was given a placebo (G CON ). The exercise protocol consisted of performing the bench press movement with a load equal to 70%1RM with maximal possible velocity (X/0/X/0). The experimental sets were performed to momentary muscular failure. Results: The repeated measures ANOVA between the G CAF and G CON groups revealed statistically significant differences in 2 variables. Post-hoc tests demonstrated statistically significant differences in TUT when comparing the group supplemented with caffeine (13.689 s G CAF ) to the one ingesting a placebo (15.332 s G CON ) at p = 0.002. Significant differences were also observed in mean velocity during the eccentric phase of movement (0.690 m/s in the G CAF to 0.609 in G CON with p = 0.002). There were no significant differences in generated power and velocity in the CON phase of the movement between the G CAF and G CON. Conclusions: The main finding of the study is that CAF ingestion increases movement velocity of the bar in the eccentric phase of the movement, what results in shortening of the time under tension (TUT) needed for performing a specific number of repetitions, without decreasing power and velocity in the CON phase of the movement.

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Caffeine for Sports Performance

Cited by 60 publications

References 0 publications

Caffeine content of pre‐workout supplements commonly used by Australian consumers

Caffeine content of pre‐workout supplements commonly used by Australian consumers

What can isolated skeletal muscle experiments tell us about the effects of caffeine on exercise performance?

The acute effects of caffeine intake on time under tension and power generated during the bench press movement

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