The dose-dependent effect of caffeine supplementation on performance, reaction time and postural stability in CrossFit - a randomized placebo-controlled crossover trial

Caffeine (CAF) ingestion improves performance in a broad range of exercise tasks. Nevertheless, the CAF-induced, dose-dependent effect on discipline-specific performance and cognitive functions in CrossFit/High-Intensity Functional Training (HIFT) has not been sufficiently investigated. The aim of t...

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Published in:Journal of the International Society of Sports Nutrition 2024-12, Vol.21 (1), p.2301384-2301384
Main Authors: Główka, Natalia, Malik, Jakub, Podgórski, Tomasz, Stemplewski, Rafał, Maciaszek, Janusz, Ciążyńska, Julia, Zawieja, Emilia E, Chmurzynska, Agata, Nowaczyk, Paulina M, Durkalec-Michalski, Krzysztof
Format: Article
Language:English
Subjects:
Athletic Performance - physiology
Caffeine
Caffeine - pharmacology
cognitive function
Cross-Over Studies
Cytochrome P-450 CYP1A2
Dietary Supplements
Double-Blind Method
ergogenic support
high-intensity functional exercise
Humans
Lactic Acid
Polyesters
Reaction Time
sports dietetics
stability
supplementation
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Summary:Caffeine (CAF) ingestion improves performance in a broad range of exercise tasks. Nevertheless, the CAF-induced, dose-dependent effect on discipline-specific performance and cognitive functions in CrossFit/High-Intensity Functional Training (HIFT) has not been sufficiently investigated. The aim of this study was to evaluate the effect of acute supplementation of three different doses of CAF and placebo (PLA) on specific performance, reaction time (R ), postural stability (P ), heart rate (HR) and perceived exertion (RPE). In a randomized double-blind placebo-controlled crossover design, acute pre-exercise supplementation with CAF (3, 6, or 9 mg/kg body mass (BM)) and PLA in 26 moderately trained CrossFit practitioners was examined. The study protocol involved five separate testing sessions using the Fight Gone Bad test (FGB) as the exercise performance evaluation and biochemical analyses, HR and RPE monitoring, as well as the assessment of R and P , with regard to (rs762551) and (rs5751876) single nucleotide polymorphism (SNP). Supplementation of 6 mg /kg induced clinically noticeable improvements in FGB results, R and pre-exercise motor time. Nevertheless, there were no significant differences between any CAF doses and PLA in FGB , HR , HR , RPE, pre/post-exercise R , P variables or pyruvate concentrations. Lactate concentration was higher (  
ISSN:1550-2783
1550-2783
DOI:10.1080/15502783.2023.2301384