title: Separate and Combined Effects of Caffeine and Sodium-Bicarbonate Intake on Judo Performance.
abstract: The combined supplementation of caffeine (CAF) and sodium bicarbonate (NaHCO3) may have a potential ergogenic effect during intermittent-exercise tasks such as judo; however, its effect in this sport has not been tested.
  
  
  OBJECTIVE
  To investigate the isolated and combined effects of CAF and NaHCO3 on judo performance.
  
  
  METHODS
  Ten judokas performed 4 supplementation protocols-NaHCO3, CAF, NaHCO3 + CAF, and placebo (PLA) (cellulose)-followed by 3 Special Judo Fitness Tests (SJFTs) interspaced with 5 min rest.
  
  
  RESULTS
  In the first SJFT, the combined supplement (NaHCO3 + CAF) resulted in a higher number of throws than with PLA (24.4 ± 0.9 and 23.2 ± 1.5 throws, respectively, P = .02). There was no significant difference between conditions for the 2nd SJFT (P = .11). In the 3rd SJFT, NaHCO3 and NaHCO3 + CAF resulted in more throws than with PLA (23.7 ± 1.6, 24.4 ± 1.0, and 22.0 ± 1.6 throws, P = .001 and P = .03, respectively). When the total throws performed in the 3 SJFTs were summed, they were higher than PLA only for NaHCO3 + CAF (68.8 ± 4.4 and 72.7 ± 3.1 throws, respectively, P = .003). Postexercise plasma lactate after each SJFT was higher in all experimental conditions than with PLA (P = .001). There was no significant difference in rating of perceived exertion across the conditions (P = .18).
  
  
  CONCLUSIONS
  The results of the current study show that the combined supplementation of NaHCO3 + CAF increases judo performance compared with PLA.
authors.affiliation: Department of Physical Education and Sports Science, Federal University of Pernambuco, Pernambuco, Brazil.
authors.forename: Leandro C
authors.initials: LC
authors.lastname: Felippe
authors.forename: João P
authors.initials: JP
authors.lastname: Lopes-Silva
authors.forename: Rômulo
authors.initials: R
authors.lastname: Bertuzzi
authors.forename: Cian
authors.initials: C
authors.lastname: McGinley
authors.forename: Adriano E
authors.initials: AE
authors.lastname: Lima-Silva
mesh_terms: D056352:Athletes; D054874:Athletic Performance / Q000502:physiology*; D002110:Caffeine / Q000008:administration & dosage*; D000697:Central Nervous System Stimulants / Q000008:administration & dosage*; D004311:Double-Blind Method; D005080:Exercise Test; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D016139:Martial Arts / Q000502:physiology*; D005082:Physical Exertion; D017693:Sodium Bicarbonate / Q000008:administration & dosage*
chemical_list: D000697:Central Nervous System Stimulants; D019344:Lactic Acid; D002110:Caffeine; D017693:Sodium Bicarbonate