Produto comercial baseado na cafeína e no citrus aurantium não promove a melhoria nos testes anaeróbios: estudo crossover e duplo cego

This study was aimed at analyzing the effect of using products with ergogenic properties on the women’s performance during anaerobic physical tests. Materials and Methods: A double-blind experimental crossover randomized and controlled study with administration of commercial products or placebo substance was performed. Commercial products containing 2.31 mg.kg -1 of caffeine and 1.88 mg.kg -1 of Citrus aurantium , as well placebo products were administered to 8 women aged 18-30 (21.5 ± 2.1), who were performing strength physical training at least for six months.  After sample randomization, four trials were made and the groups were reversed (supplement group and placebo group). The static strength including muscle potency and resistance were evaluated by abdominal resistance tests, flexion and extension of the elbow, vertical jump, lumbar traction and handgrip strength, with the latter two variables assessed by mechanical dynamometer. Results: There was no statistical difference in the performance of women in the anaerobic tests (p>0.05) when the four trials were compared, independent of the supplement use group (GS) or placebo group (GP). Conclusion: In the present study, the recommended dose of commercial products showed a non-significant effect during static strength, potency and muscle strength. Moreover, we suggest that the inexperience of the subjects in performing the proposed tests, particularly the vertical jump, arm flexion and extension, associated to unknown factors, caused no results in relation to performance improvement.