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Purpose: To examine the effect of caffeine supplementation on dribbling speed in elite female and male basketball players. Methods: A double-blind, counterbalanced, randomized, crossover design was used. Elite basketball players (N = 21; 10 female, 11 male; age 18.3 [3.3] y) completed placebo (3 mg·kg−1 of body mass of dextrose) and caffeine (3 mg·kg−1 of body mass) trials 1 wk apart during the in-season phase. During each trial, players completed 20-m linear sprints with and without dribbling a basketball. Performance times were recorded at 5-, 10-, and 20-m splits. Dribbling speed was measured using traditional (total performance time) and novel (dribble deficit) methods. Dribble deficit isolates the added time taken to complete a task when dribbling compared with a nondribbling version of the same task. Comparisons between placebo and caffeine conditions were conducted at group and individual levels. Results: Nonsignificant (P > .05), trivial to small (effect size = 0.04–0.42) differences in dribbling speed were observed between conditions. The majority (20 out of 21) of players were classified as nonresponders to caffeine, with 1 player identified as a negative responder using dribble-deficit measures. Conclusions: Results indicate that caffeine offers no ergogenic benefit to dribbling speed in elite basketball players. The negative response to caffeine in 1 player indicates that caffeine supplementation may be detrimental to dribbling speed in specific cases and emphasizes the need for individualized analyses in nutrition-based sport-science research.

Scanlan and Dalbo are with the Human Exercise and Training Laboratory, Central Queensland University, Rockhampton, Australia. Conte is with the Inst of Sport Science and Innovations, Lithuanian Sports University, Kaunas, Lithuania. Stojanović, Stojiljković, Stanković, Antić, and Milanović are with the Faculty of Sport and Physical Education, University of Niš, Niš, Serbia. Milanović is also with the Koper Science and Research Center, Inst for Kinesiology Research, Koper, Slovenia.

Milanović (zoooro_85@yahoo.com) is corresponding author.
International Journal of Sports Physiology and Performance
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