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Betaine supplementation improves CrossFit performance and increases testosterone levels, but has no influence on Wingate power: randomized crossover trial

2023, Zawieja, Emilia, Durkalec-Michalski, Krzysztof, Sadowski, Marcin, Główka, Natalia, Chmurzyńska, Agata

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The effect of caffeine dose on caffeine and paraxanthine changes in serum and saliva and CYP1A2 enzyme activity in athletes: a randomized placebo-controlled crossover trial

2024, Główka, Natalia, Malik, Jakub, Anioła, Jacek, Zawieja, Emilia, Chmurzyńska, Agata, Durkalec-Michalski, Krzysztof

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

2024, Główka, Natalia, Malik, Jakub, Podgórski, Tomasz, Stemplewski, Rafał, Maciaszek, Janusz, Ciążyńska, Julia, Zawieja, Emilia, Chmurzyńska, Agata, Nowaczyk, Paulina M., Durkalec-Michalski, Krzysztof