Efeito agudo da suplementação isolada e combinada de carboidratos e cafeína no desempenho físico e técnico de futebolistas

Abstract

The carbohydrate (CHO) and caffeine (CAF) ingestion have been routinely investigated not only to enhance soccer physical performance, but also to attenuate the decline of technical and physical performance during the final stages of the match. Therefore, aiming at contributing to the discussion of the problem, this dissertation presents two articles: a literature review of the main acute effects of isolated and combined CHO and CAF supplementation on physical and technical performance of soccer players; the second article refers to an experimental studying aiming to investigate whether isolated and combined CHO and CAF supplementation administrated during a 4-h recovery period would have effect on subsequent performance parameters related to soccer. Thirteen male soccer players completed four experimental trials in a randomized, double-blinded, and crossover design. In the morning, participants performed a 90-min Loughborough Intermittent Shuttle Test (LIST). Then, participants ingested: 1) 1.2 g · kg-1 body mass (BM) · h-1 CHO of a 20% CHO solution immediately after and 1, 2, and 3 h post LIST; 2) a dose of CAF (6 mg · kg-1 BM) 3 h post LIST; 3) the same amount of CHO combined with CAF (CHO + CAF); 4) distilled water combined with cellulose capsule (PLA). After a 4-h recovery period the participants performed in sequence (5 min between each test) three countermovement jump test (CMJ), a Loughborough Soccer Passing test (LSPT) and a repeated sprint test (5 x 30 m). CAF tended to improve CMJ height compared to baseline (34.9 ± 4.4 vs. 32.9 ± 3.5 cm, p = .07), and significantly improved LSPT performance (40.9 ± 13.0 vs. baseline 45.8 ± 11.6 s, p = .05). Both CHO and CHO + CAF ingestion promoted negative effects on RPE and pleasure-displeasure. In conclusion, the isolated ingestion of CAF during a 4-h recovery period leads to an improvement in jump and passing performance, while there is no benefit when combined with CHO.