Restricted access

Purchase article

USD $24.95

Student 1 year subscription

USD $107.00

1 year subscription

USD $142.00

Student 2 year subscription

USD $203.00

2 year subscription

USD $265.00

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.


To investigate the isolated and combined effects of CAF and NaHCO3 on judo performance.


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.


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).


The results of the current study show that the combined supplementation of NaHCO3 + CAF increases judo performance compared with PLA.

Felippe, Lopes-Silva, and Lima-Silva are with the Dept of Physical Educationand Sports Science, Federal University of Pernambuco, Pernambuco, Brazil. Bertuzzi is with the School of Sport and Physical Education, University of São Paulo, São Paulo, Brazil. McGinley is with the College of Sport and Exercise Science, Victoria University, Melbourne, Australia.

Address author correspondence to Adriano Lima-Silva at
International Journal of Sports Physiology and Performance