Effects of caffeine on isometric handgrip strength: A meta-analysis

Grgić, Jozo

doi:10.1016/j.clnesp.2021.12.007

Cited by 12 publications

(8 citation statements)

References 46 publications

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“…Caffeine has been reported as a useful ergogenic aid for achieving an acute increase in maximal upper body strength [ 24 ] and in the present meta-analysis, caffeine supplementation improved handgrip strength performance. This supported the findings from a previous meta-analysis [ 36 ], which showed, independently of dose or form, supplementation increases handgrip strength. Regarding the ES, the present meta-analysis showed a higher impact than the aforementioned study.…”

Section: Discussionsupporting

confidence: 91%

“…In combat sports, caffeine effects are inconsistent [ 8 ], which prevents drawing concretized conclusions on this topic. To date, several meta-analyses [ 19 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ] investigating the impact of caffeine supplementation on sports performance have been conducted. In combat sports specifically, a recent systematic review with a meta-analytic approach [ 37 ] was conducted; however, the aforementioned meta-analysis was limited to some combat sports performances and neglected several other variables, such as the handgrip strength, the dynamic strength-endurance performance, the special judo fitness test index, the heart rate, and the rate of perceived exertion.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Acute Effects of Caffeine Supplementation on Physical Performance, Physiological Responses, Perceived Exertion, and Technical-Tactical Skills in Combat Sports: A Systematic Review and Meta-Analysis

et al. 2022

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Although the effects of caffeine supplementation on combat sports performance have been extensively investigated, there is currently no consensus regarding its ergogenic benefits.This systematic review with meta-analysis aimed to summarize the studies investigating the effects of caffeine supplementation on different aspects of performance in combat sports and to quantitatively analyze the results of these studies to better understand the ergogenic effect of caffeine on combat sports outcomes. A systematic search for randomized placebo-controlled studies investigating the effects of caffeine supplementation on combat sports’ performance was performed through Scopus, Pubmed, Web of Science and Cochrane Library databases up to 18 April 2022. Random-effects meta-analyses of standardized mean differences (Hedge’s g) were performed to analyze the data. Twenty-six studies of good and excellent methodological quality (based on the Pedro scale) fulfilled the inclusion criteria. The meta-analysis results revealed caffeine has a small but evident effect size (ES) on handgrip strength (ES = 0.28; 95% CI: 0.04 to 0.52; p = 0.02), and total number of throws during the special judo fitness test (SJFT) (ES = 0.42; 95% CI: 0.06 to 0.78; p = 0.02). Regarding the physiological responses, caffeine increased blood lactate concentration ([La]) in anaerobic exercise (ES = 1.23; 95% CI: 0.29 to 2.18; p = 0.01) and simulated combat (ES = 0.91; 95% CI: 0.34 to 1.47; p = 0.002). For Heart Rate (HR), caffeine increased HR final (ES = 0.31; 95% CI: 0.11 to 0.52; p = 0.003), and HR 1min (ES = 0.20; 95% CI 0.004 to 0.40; p = 0.045). However, caffeine had no impact on the countermovement jump height, the SJFT index, the judogi strength-endurance test, the number and duration of offensive actions, HR at the end of the fight, and the rating of perceived exertion. Caffeine supplementation may be ergogenic for a range of combat sports aspects involving isometric strength, anaerobic power, reaction time, and anaerobic metabolism. However, supplementation effects might be ineffective under certain circumstances, indicating supplementation needs to take into account the performance metric in question prior to creating a dosing protocol.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Acute Effects of Caffeine Supplementation on Physical Performance, Physiological Responses, Perceived Exertion, and Technical-Tactical Skills in Combat Sports: A Systematic Review and Meta-Analysis

et al. 2022

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“…Our behavioral data reinforce the evidence that systemic caffeine administration is ergogenic [2-5, 12, 25]. However, we emphasize that this previous knowledge analyzed treadmill running performance, and we demonstrate here for the first time that caffeine increases (grip) muscle strength in mice, an effect also observed in humans [42,43].…”

Section: Discussionsupporting

confidence: 90%

“…Our behavioral data reinforce the evidence that systemic caffeine administration is ergogenic [2-5, 7, 16]. However, we emphasize that this previous knowledge analyzed treadmill running performance, and we demonstrate here for the first time that caffeine increases (grip) muscle strength in mice, an effect well observed in humans [27,28]. Also, we demonstrated that local caffeine treatment in the striatum reproduces these ergogenic effects (systemic treatment) for the first time.…”

Section: Discussionsupporting

confidence: 90%

The striatum drives the ergogenic effects of caffeine

Alves

Speck

Farias

et al. 2022

Preprint

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Caffeine is one of the main ergogenic resources used in exercise and sports. Previously, we presented the ergogenic mechanism of caffeine through neuronal A2AR antagonism in the central nervous system [1]. We demonstrate here that the striatum rules the ergogenic effects of caffeine through neuroplasticity changes. Thirty-four Swiss (8-10 weeks, 47 ± 1.5 g) and twenty-four C57BL6 (8-10 weeks, 23.9 ± 0.4 g) adult male mice were challenged in behavior and electrophysiology experiments using caffeine and SH-SY5Y cells for energetic metabolism. Systemic (15 mg/kg, i.p.) or striatal (bilateral, 15 μg) caffeine was psychostimulant in the open field (p < 0.05) and increased gripping muscle power (p < 0.05). Caffeine also induced long-term potentiation (LTP) in striatal slices (p < 0.05) and increased mitochondrial mass (p < 0.05) and membrane potential p < 0.05) in SH-SY5Y dopaminergic cells. In summary, our results demonstrate that caffeine stimulation in the striatum produces ergogenic effects accompanied by an LTP, possibly associated with acute increased mitochondrial metabolism observed in dopaminergic cell lines.

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“…This EA helped to increase isometric peak torque, which has been demonstrated in other studies in men to date [ 84 ]. As for hand grip strength, CAF seemed to enhance this variable as well, although most of the studies proving its effects have been carried out in the male population [ 85 ].…”

Section: Discussionmentioning

confidence: 99%

Ergogenic Aids to Improve Physical Performance in Female Athletes: A Systematic Review with Meta-Analysis

et al. 2022

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Most intervention studies investigating the effects of ergogenic aids (EAs) on sports performance have been carried out in the male population. Thus, the aim of this systematic review and meta-analysis was to summarize the effects in the existing literature of EAs used by female athletes on performance. A literature research was conducted, and a descriptive analysis of the articles included in the systematic review was carried out. Meta-analyses could be performed on 32 of the included articles, evaluating performance in strength, sprint, and cardiovascular capacity. A random-effects model and the standardized mean differences (SMD) ± 95% confidence intervals (CI) were reported. The results showed that caffeine helped to improve jumping performance, isometric strength values, and the number of repetitions until failure. Caffeine and sodium phosphate helped to improve sprint performance. Aerobic tests could be improved with the use of taurine, caffeine, and beta-alanine. No conclusive effects of beetroot juice, polyphenols, or creatine in improving aerobic performance were shown. In terms of anaerobic variables, both caffeine and sodium phosphate could help to improve repeated sprint ability. More studies are needed in female athletes that measure the effects of different EAs on sports performance, such as beetroot juice, beta-alanine or sodium phosphate, as the studies to date are scarce and there are many types of EA that need to be further considered in this population, such as creatine and taurine.

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Effects of caffeine on isometric handgrip strength: A meta-analysis

Cited by 12 publications

References 46 publications

Acute Effects of Caffeine Supplementation on Physical Performance, Physiological Responses, Perceived Exertion, and Technical-Tactical Skills in Combat Sports: A Systematic Review and Meta-Analysis

Acute Effects of Caffeine Supplementation on Physical Performance, Physiological Responses, Perceived Exertion, and Technical-Tactical Skills in Combat Sports: A Systematic Review and Meta-Analysis

The striatum drives the ergogenic effects of caffeine

Ergogenic Aids to Improve Physical Performance in Female Athletes: A Systematic Review with Meta-Analysis

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