Effects of acute ingestion of caffeinated chewing gum on performance in elite judo athletes. - Filip-Stachnik, Aleksandra; Krawczyk, Robert; Krzysztofik, Michal; Rzeszutko-Belzowska, Agata; Dornowski, Marcin; Zajac, Adam; Del Coso, Juan; Wilk, Michal (Journal of the International Society of Sports Nutrition, 2021)