Acute Caffeine Ingestion’s Increase of Voluntarily Chosen Resistance-Training Load After Limited Sleep

Cook, Christian J.; Beaven, Christopher Martyn; Kilduff, Liam P.; Drawer, Scott

doi:10.1123/ijsnem.22.3.157

Cited by 34 publications

(25 citation statements)

References 37 publications

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“…>250 mg), but this response is reduced in regular caffeine users (Lovallo et al 2005). Caffeine intakes in the SR group were not different to habitual caffeine consumption, nor were they as high as those examined in previous studies (Cook et al 2012;Lovallo et al 2006). Therefore, it is less likely lower energy and/or CHO intakes and higher caffeine consumption among the SR condition contributed to increased cortisol levels observed in the current study.…”

Section: Discussioncontrasting

confidence: 49%

“…An ad libitum intake of fluid also resulted in higher caffeine consumption for the SR condition on day 1 and day 2 when compared to the CON, which is a further limitation of this study. The cortisol response to exercise (Cook et al 2012;Lovallo et al 2006) can increase with high doses of caffeine (e.g. >250 mg), but this response is reduced in regular caffeine users (Lovallo et al 2005).…”

Section: Discussionmentioning

confidence: 99%

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The impact of sleep restriction while performing simulated physical firefighting work on cortisol and heart rate responses

Wolkow

Aisbett

Reynolds

et al. 2015

Int Arch Occup Environ Health

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Findings highlight the protective role an 8-h sleep opportunity between shifts of firefighting work has on preserving normal cortisol levels when compared to a 4-h sleep opportunity which resulted in elevated afternoon and evening cortisol. Given the adverse health outcomes associated with chronically high cortisol, especially later in the day, future research should examine how prolonged exposure to firefighting work (including restricted sleep) affects firefighters' cortisol levels long term. Furthermore, monitoring cortisol levels post-deployment will determine the minimum recovery time firefighters need to safely return to the fire-ground.

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Section: Discussioncontrasting

confidence: 49%

Section: Discussionmentioning

confidence: 99%

The impact of sleep restriction while performing simulated physical firefighting work on cortisol and heart rate responses

Wolkow

Aisbett

Reynolds

et al. 2015

Int Arch Occup Environ Health

View full text Add to dashboard Cite

show abstract

“…The muscle endurance test used in this study further confirmed that caffeine ingestion is ergogenic for this fitness component in resistance-trained men. This study adds to the body of evidence showing improvements in muscle endurance following caffeine ingestion [28][29][30][31][32]. However, a more novel finding is that caffeine is ergogenic for power and velocity outputs when the number of repetitions between the caffeine and placebo conditions is matched.…”

Section: Effects Of Caffeine On Exercise Performancementioning

confidence: 75%

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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“…Limited evidence also shows an ergogenic effect of caffeine on muscular endurance in a sleep-deprived condition (6 hours of sleep or less) [61]. Several studies that carried out muscular endurance assessments following maximum strength testing did not observe a significant ergogenic effect of caffeine on muscular endurance [27,43,44], suggesting that caffeine supplementation may not be as effective on muscular endurance as fatigue develops.…”

Section: Effects Of Caffeine On Muscular Endurancementioning

confidence: 99%

The Influence of Caffeine Supplementation on Resistance Exercise: A Review

et al. 2018

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This paper aims to critically evaluate and thoroughly discuss the evidence on the topic of caffeine supplementation when performing resistance exercise, as well as provide practical guidelines for the ingestion of caffeine prior to resistance exercise. Based on the current evidence, it seems that caffeine increases both maximal strength and muscular endurance. Furthermore, power appears to be enhanced with caffeine supplementation, although this effect might, to a certain extent, be caffeine dose-and external load-dependent. A reduction in rating of perceived exertion (RPE) might contribute to the performance-enhancing effects of caffeine supplementation, as some studies have observed decreases in RPE coupled with increases in performance following caffeine ingestion. However, the same does not seem to be the case for pain perception, as there is evidence showing acute increases in resistance exercise performance without any significant effects of caffeine ingestion on pain perception. Some studies have reported that caffeine ingestion did not affect exercise-induced muscle damage but that it might reduce perceived resistance exercise-induced delayed onset muscle soreness; however, this needs to be explored further. There is some evidence that caffeine ingestion, compared to a placebo, may lead to greater increases in the production of testosterone and cortisol following resistance exercise. However, given that the acute changes in hormone levels seem to be weakly correlated with hallmark adaptations to resistance exercise, such as hypertrophy and increased muscular strength, these findings are likely of questionable practical significance. Although not without contrasting findings, the available evidence suggests that caffeine ingestion can lead to acute increases in blood pressure (primarily systolic), and, thus, caution is needed regarding caffeine supplementation among individuals with high blood pressure. In the vast majority of studies, caffeine was administered in capsule or powder forms, and therefore, the effects of alternative forms of caffeine such as chewing gums or mouth rinses on resistance exercise performance remain 3 unclear. The emerging evidence suggests that coffee might be at least equally ergogenic as caffeine alone when the caffeine dose is matched. Doses in the range of 3 to mg•kg-1 seem to be adequate for eliciting an ergogenic effect when administered 60 min pre-exercise. In general, caffeine seems to be safe when taken in the recommended doses. However, at doses as high as 9 mg•kg-1 or higher, side-effects such as insomnia might be more pronounced. It remains unclear whether habituation reduces the ergogenic benefits of caffeine on resistance exercise, as no evidence exists for this type of exercise. Caution is needed when extrapolating these conclusions to females as the vast majority of studies involved only male participants. Key points  Caffeine supplementation may acutely enhance muscular endurance, maximal strength, and power in resistance exercise.  Doses in the range 3 to 9 mg...

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Acute Caffeine Ingestion’s Increase of Voluntarily Chosen Resistance-Training Load After Limited Sleep

Abstract: Caffeine increased voluntary workload in professional athletes, even more so under conditions of self-reported limited sleep. Caffeine may prove worthwhile when athletes are tired, especially in those identified as responders.

Cited by 34 publications

References 37 publications

The impact of sleep restriction while performing simulated physical firefighting work on cortisol and heart rate responses

The impact of sleep restriction while performing simulated physical firefighting work on cortisol and heart rate responses

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

The Influence of Caffeine Supplementation on Resistance Exercise: A Review

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