Effects of caffeine intake on muscle strength and power: a systematic review and meta-analysis

Grgić, Jozo; Trexler, Eric T.; Lazinica, Bruno; Pedišić, Željko

doi:10.1186/s12970-018-0216-0

Cited by 239 publications

(304 citation statements)

References 39 publications

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“…Caffeine ingestion resulted in increased vertical jump height in the CMJ. The ES magnitude of 0.15 observed in this study is very similar to the pooled ES of 0.17 reported in a recent meta-analysis of 10 studies [36]. This result, therefore, confirms that caffeine ingestion may have a relatively small performance-enhancing effect on vertical jump height [36][37][38].…”

Section: Effects Of Caffeine On Exercise Performancesupporting

confidence: 90%

“…The ES magnitude of 0.15 observed in this study is very similar to the pooled ES of 0.17 reported in a recent meta-analysis of 10 studies [36]. This result, therefore, confirms that caffeine ingestion may have a relatively small performance-enhancing effect on vertical jump height [36][37][38]. The acute improvement in vertical jump height following caffeine ingestion is comparable to the improvement in jump height found as a result of 4 weeks of plyometric training [39,40].…”

Section: Effects Of Caffeine On Exercise Performancesupporting

confidence: 89%

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CYP1A2 genotype and acute effects of caffeine on resistance exercise, jumping, and sprinting performance

Grgić

Pickering

Bishop

et al. 2020

Journal of the International Society of Sports Nutrition

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Background: It has been suggested that polymorphisms within CYP1A2 impact inter-individual variation in the response to caffeine. The purpose of this study was to explore the acute effects of caffeine on resistance exercise, jumping, and sprinting performance in a sample of resistance-trained men, and to examine the influence of genetic variation of CYP1A2 (rs762551) on the individual variation in responses to caffeine ingestion.Methods: Twenty-two men were included as participants (AA homozygotes n = 13; C-allele carriers n = 9) and were tested after the ingestion of caffeine (3 mg/kg of body mass) and a placebo. Exercise performance was assessed with the following outcomes: (a) movement velocity and power output in the bench press exercise with loads of 25, 50, 75, and 90% of one-repetition maximum (1RM); (b) quality and quantity of performed repetitions in the bench press exercise performed to muscular failure with 85% 1RM; (c) vertical jump height in a countermovement jump test; and (d) power output in a Wingate test.Results: Compared to placebo, caffeine ingestion enhanced: (a) movement velocity and power output across all loads (effect size [ES]: 0.20-0.61; p < 0.05 for all); (b) the quality and quantity of performed repetitions with 85% of 1RM (ES: 0.27-0.85; p < 0.001 for all); (c) vertical jump height (ES: 0.15; p = 0.017); and (d) power output in the Wingate test (ES: 0.33-0.44; p < 0.05 for all). We did not find a significant genotype × caffeine interaction effect (pvalues ranged from 0.094 to 0.994) in any of the analyzed performance outcomes.Conclusions: Resistance-trained men may experience acute improvements in resistance exercise, jumping, and sprinting performance following the ingestion of caffeine. The comparisons of the effects of caffeine on exercise performance between individuals with the AA genotype and AC/CC genotypes found no significant differences.

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Section: Effects Of Caffeine On Exercise Performancesupporting

confidence: 90%

Section: Effects Of Caffeine On Exercise Performancesupporting

confidence: 89%

CYP1A2 genotype and acute effects of caffeine on resistance exercise, jumping, and sprinting performance

Grgić

Pickering

Bishop

et al. 2020

Journal of the International Society of Sports Nutrition

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“…In response to the high demands for isometric strength and resistance that sailors must face [11,12], as well as the high % VO 2max they reach as the speed increases [9,14], those athletes who consume caffeine (20% sailors of international level and 25% of those of national level) can benefit from the use of this supplement. Since the molecular form resembles that of adenosine, caffeine blocks adenosine receptors, activating the central nervous system, which decreases the subjective perception of effort, while enhancing glycolytic metabolism, neuromuscular recruitment, and the bioavailability of calcium in myoplasm [52]; moreover, previous studies have demonstrated its ergogenic effect on the improvement of muscle strength [53] and in the face of high-intensity efforts [54].…”

Section: Discussionmentioning

confidence: 99%

Analysis of Sports Supplements Consumption in Young Spanish Elite Dinghy Sailors

et al. 2020

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The sports performance of dinghy sailors is determined by their state of nutrition and hydration. Sports supplementation plays a prominent role in elite sailors, being essential in periods of competition due to its characteristics. This study aims to analyze the consumption of sports supplements (SS) in the different categories and groups of sailors based on the level of evidence, differentiating according to sex, competitive level, and type of boat. A total of 42 sailors from national and international levels and belonging to the Laser, 420, Techno-293 and RS:X classes participated in this study. They completed a questionnaire with questions about the consumption of SS and the possible repercussions on health and/or sports performance. The results were analyzed based on the different categorizations and group organization recently established by the Australian Institute of Sport (AIS), as well as by sex, level of competition and class to which the participants belonged. The male sailors and those who competed internationally had a higher prevalence in the consumption of SS. Among the classes of vessels studied, class 420 had the lowest SS consumption. SS intake was higher during competition days, regardless of sex or level of competition. Based on the classification established by the AIS, statistically significant differences were observed in sex, level of competition, and the type of boat.

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“…These 11 items refer to specification of eligibility criteria (item 1), study randomization (item 2), concealed allocation (item 3), similarity of groups at baseline (item 4), blinding (items 5, 6, and 7), number of participants that completed the trials (item 8), intention to treat (item 9), reporting of results (item 10), and reporting of variability in the results (item 11). Based on the summary score, the studies were classified as: (a) excellent quality (9-10 points); (b) good quality (6-8 points); (c) fair quality (4-5 points); or (d) poor quality (less than 3 points), as done in previous reviews [13][14][15]). Two authors (the first and second author) performed the appraisal of methodological quality independently.…”

Section: Methodological Qualitymentioning

confidence: 99%

The Effects of Caffeine Ingestion on Measures of Rowing Performance: A Systematic Review and Meta-Analysis

et al. 2020

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The purpose of this paper was to conduct a systematic review and a meta-analysis of studies examining the acute effects of caffeine ingestion on measures of rowing performance. Crossover and placebo-controlled experiments that investigated the effects of caffeine ingestion on measures of rowing performance were included. The PEDro checklist was used to assess the methodological quality of the included studies. Seven studies of good and excellent methodological quality were included. None of the included studies examined on-water rowing. The majority of studies that were included in the meta-analysis used a 2000m rowing distance with only one using 1000m distance. Results of the main meta-analysis indicated that caffeine enhances performance on a rowing ergometer compared to placebo with a mean difference of −4.1 s (95% confidence interval (CI): −6.4, −1.8 s). These values remained consistent in the analysis in which the study that used a 1000m distance was excluded (mean difference: −4.3 s; 95% CI: −6.9, −1.8 s). We also found a significant increase in mean power (mean difference: 5.7 W; 95% CI: 2.1, 9.3 W) and minute ventilation (mean difference: 3.4 L/min; 95% CI: 1.7, 5.1 L/min) following caffeine ingestion. No significant differences between caffeine and placebo were found for the rating of perceived exertion, oxygen consumption, respiratory exchange ratio, and heart rate. This meta-analysis found that acute caffeine ingestion improves 2000m rowing ergometer performance by~4 s. Our results support the use of caffeine pre-exercise as an ergogenic aid for rowing performance.

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Effects of caffeine intake on muscle strength and power: a systematic review and meta-analysis

Cited by 239 publications

References 39 publications

CYP1A2 genotype and acute effects of caffeine on resistance exercise, jumping, and sprinting performance

CYP1A2 genotype and acute effects of caffeine on resistance exercise, jumping, and sprinting performance

Analysis of Sports Supplements Consumption in Young Spanish Elite Dinghy Sailors

The Effects of Caffeine Ingestion on Measures of Rowing Performance: A Systematic Review and Meta-Analysis

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