On match days three drinks were taken: before, during and after each match. During the match subjects drank 750 mL/h of their test drink and 250 mL just after the match. The placebo drinks were specially developed to be similar in color and taste to the sports drinks. Moreover, subjects were informed that they were testing two sports drinks similar in appearance but different in composition and were therefore unaware that they may be taking a placebo. The drinks

were kept at 8–10°C. Using a 10-point scale as a measure #BIBW2992 price randurls[1|1|,|CHEM1|]# of gastrointestinal discomfort, the drinks were well tolerated (data not shown). Composition of drinks The nutritional composition of the pre-match drink was as follows: fructose 36 g.L−1; maltodextrin 31 g.L−1; hydroxycitrate 300 mg.L−1; sodium citrate 7 g.L−1; caffeine 140 mg.L−1; vitamins see more B1 0.4 mg.L−1, B2 0.4 mg.L−1, B6 0.6 mg.L−1 (70 g.L−1, 1142 kJ.L−1). Composition of the placebo pre-match drink: citric acid, natural grapefruit flavor, sucralose, acesulfame potassium, sillicium dioxide, maltodextrin, beetroot juice concentrate (amount of traces), tartrazine (3.0 g.L−1, 35.8 kJ.L−1). Match drink: maltodextrin

31.6 g.L−1, dextrose 24.2 g.L−1, fructose 12.8 g.L−1, Branched-Chain Amino Acids 4 g.L−1, curcumin 250 mg.L−1, piperine 2.6 mg.L−1, caffeine

75 mg.L−1, sodium 884 mg.L−1, magnesium 100 mg.L−1, zinc 5 mg.L−1, vitamins C 15 mg.L−1, E 5 mg.L−1, B1 0.7 mg.L−1, B2 0.4 mg.L−1, B3 9 mg.L−1 (80 g.L−1, 1254 kJ.L−1). Placebo match drink: natural flavors, malic and citric through acids, xanthan gum, acesulfame potassium, sucralose, silicium dioxide, yellow FCF, tartrazine (3.2 g.L−1, 50 kJ.L−1). Post-match drink: proteins 40 g.L−1; glucose 28.8 g.L−1; fructose 14.4 g.L−1; lipids 7.2 g.L−1; curcumin 680 mg.L-1; piperine 7.6 mg.L−1; sodium chloride 576 mg.L−1; potassium 156 mg.L−1; vitamins C 120 mg.L−1; E 20 mg.L−1; B1 5.6 mg.L−1; B2 3.3 mg.L−1; B3 72 mg.L−1; B6 4 mg.L−1 (64 g.L−1, 2144 kJ.L−1). Placebo post-match drink: natural flavors, titanium dioxide, tartrazine, maltodextrin, beetroot juice concentrate (amount of traces), citric acid, acesulfame potassium, sucralose, silicium dioxide (3.0 g.L−1, 68 kJ.L−1). All drinks were provided by Nutratletic (Aytré, France) and respected the current legislation for dietary products. Tennis tournament simulation Each tournament took place over a weekend. On the experiment days (SPD and PLA sessions), the players arrived at the tennis club at 07 h00 after an overnight fast. A standardized breakfast was given to the subjects. The eight players were randomly divided into two groups of four players. Every player in each group played randomly against each of the three other players. Therefore, each player played three matches.