21
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      A ingestão de bicarbonato de sódio pode contribuir para o desempenho em lutas de judô? Translated title: Can sodium bicarbonate intake contribute to judo fights performance? Translated title: ¿Ingerir bicarbonato de sodio puede contribuir en el mejor desempeño de competiciones de judo?

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          O objetivo deste estudo foi investigar o efeito da ingestão de NaHCO3 sobre o desempenho no judô. Seis atletas do sexo masculino ingeriram 0,3g x kg¹ de peso corporal de NaHCO3 ou CaCO3 (placebo) 2h antes de três lutas de 5 min, intercaladas por 15 min de recuperação. Imediatamente após e 15 min após cada luta, os atletas relataram a percepção subjetiva de esforço. A concentração sanguínea de lactato foi verificada em repouso, após o aquecimento, 0, 3, 5, 7, 10 e 15 min após cada luta. O mesmo protocolo experimental foi repetido duas vezes por cada atleta, com exceção da substância ingerida. O estudo adotou o modelo duplo-cego contrabalançado. Não houve diferença significativa para as variáveis de desempenho. A percepção subjetiva de esforço não diferiu entre os tratamentos e a concentração sanguínea de lactato foi significativamente maior (p < 0,05) após a ingestão de NaHCO3, especialmente nos primeiros momentos da coleta. Concluindo, os efeitos ergogênicos do NaHCO3 não parecem ser suficientes para contribuir para a melhora da performance em lutas de judô. Contudo, as limitações do modelo utilizado devem ser consideradas quando da generalização dos resultados. Estudos futuros devem utilizar outras ferramentas para avaliar o desempenho no judô.

          Translated abstract

          The objective of this study was to investigate the effect of the NaHCO3 ingestion on the judo performance. Six male athletes ingested 0.3 g x kg¹ body weight of NaHCO3 or CaCO3 (placebo) 2 h before 3 fights of 5 min, with 15 min recovery. Immediately afterwards, and 15 min after each fight, the athletes related their perceived exertion. The blood lactate concentration was verified in rest, after warming up, 0, 3, 5, 7, 10 and 15 min after each fight. The same experimental protocol was repeated twice by each athlete, except for the ingested substance. The study adopted the counterbalanced double-blind model. There was no significant difference for the performance variables. The perceived exertion did not differ among the treatments, and the blood lactate concentration was significantly greater (p < 0.05) after NaHCO3 ingestion in the first moments of the protocol. In conclusion, the ergogenic effects of NaHCO3 are not enough to contribute to the improvement of the performance in judo fights. However, the model limitations must be considered when generalizing these results. Future studies should use other tools to evaluate the performance in judo.

          Translated abstract

          El objetivo de este trabajo ha sido el de investigar el efecto sobre el desempeño en judo al ingerir NaHCO3. Seis deportistas del sexo masculino ingirieron 0,3 g x kg-1 de peso corporal de NaHCO3 o CaCO3 (placebo) 2 h antes de 3 luchas de 5 min, intercaladas por 15 min de recuperación. Inmediatamente después, y 15 min después de cada lucha, los deportistas relataron la percepción subjetiva del esfuerzo. La concentración sanguínea de lactato fue verificada en reposo, después del precalentamiento, 0, 3, 5, 7, 10 y 15 min después de cada lucha. El mismo protocolo experimental fue repetido dos veces en cada deportista, con excepción de la sustancia ingerida. El estudio adoptó el modelo doble-ciego contrabalanceado. No hubo diferencia significativa para las variables de desempeño. La percepción subjetiva del esfuerzo no difirió entre los tratamientos, y la concentración sanguínea de lactato fue significativamente mayor (p < 0.05) después de ingerir NaHCO3, especialmente en los primeros momentos de colecta. En conclusión, los efectos ergogénicos de NaHCO3 no parecen ser suficientes para contribuir en la mejoría del desempeño en las luchas de judo. A pesar de eso, las limitaciones del modelo utilizado deben ser consideradas al intentar generalizar resultados. Estudios futuros deben utilizar otras herramientas para evaluar el desempeño en el judo.

          Related collections

          Most cited references33

          • Record: found
          • Abstract: found
          • Article: not found

          Bicarbonate ingestion: effects of dosage on 60 s cycle ergometry.

          Nine healthy male subjects who were all participating in athletic events volunteered to take part in this study, the aim of which was to determine whether there are specific dosages of sodium bicarbonate (HCO3-) that are useful as an ergogenic aid as far as anaerobic performance times are concerned. A control, placebo (CaCO3 500 mg kg-1) and five dosages of bicarbonate (100, 200, 300, 400 and 500 mg kg-1) were used. The anaerobic test consisted of pedalling a Repco Exertech cycle ergometer for 1 min during which total work (kJ) and peak power (W) were measured. The subjects completed more work in the 200 (P < 0.05), 300, 400 and 500 mg kg-1 (P < 0.005) trials with most work being undertaken in the 300 mg kg-1 trial (41.9 kJ min-1). Peak power was not significantly different from the control until the 300 mg kg-1 dose, and there were no further changes from this with increasing doses of HCO3-. The highest level of peak power achieved was 1295 +/- 72.8 W at the 300 mg kg-1 dosage. Blood pH indicated that after ingestion of all but the 100 mg kg-1 dose, a state of alkalosis was achieved (P < 0.005), and this was also indicated by changes in base excess. Bicarbonate levels increased post-ingestion in all but the 100 mg kg-1 dose, with these changes reflecting the changes that occurred in the work output. Blood lactate (BLa) levels increased post-exercise (P < 0.0001).(ABSTRACT TRUNCATED AT 250 WORDS)
            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            Effect of induced alkalosis on exhaustive leg press performance.

            Fifteen males were studied before, during, and in recovery from exhaustive resistance exercise 105 min after ingesting 0.3 g.kg-1 of either a placebo (white flour) or sodium bicarbonate (NaHCO3). The exercise consisted of five maximal sets on a leg press machine, The load was adjusted to maintain the number of repetitions per set for each subject at approximately 12 repetitions. A significant (P < 0.05) increase in pH (7.40 to 7.47), oxygenated base excess (OxyBE) (-1.3 to 4.0 mEq.L-1), and bicarbonate concentration ([HCO3-]) (22.8 to 27.4 mM) was achieved before exercise with the ingestion of NaHCO3. The exercise protocol produced significant changes in acid base status consistent with metabolic acidosis for both trials (pH sets 1-5: placebo, 7.4 to 7.26; NaHCO3, 7.47 to 7.33), (OxyBE sets 1-5: placebo, -1.3 to -12.3 mEq.L-1; NaHCO3, 4.0 to -6.9 mEq.L-1) and ([HCO3-] sets 1-5: placebo, 22.9 to 14.0 mM; NaHCO3, 27.4 to 17.6 mM). After every set; pH, OxyBE, and [HCO3-] were significantly higher in the NaHCO3 trial. Blood lactate concentration ([La-]) significantly increased throughout exercise for both trials ([La-] sets 1-5: placebo, 4.6 to 11.3 mM; NaHCO3, 4.8 to 13.4 mM). After sets 4 and 5, blood [La-] was significantly higher in the NaHCO3 trial. Bicarbonate ingestion did not improve performance (total repetitions: NaHCO3 = 59 +/- 3; placebo = 60 +/- 2). This may be a result of a lower demand on the whole body metabolic system in comparison with that for other modes of exercise in which ergogenic effects have been found.
              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

              Sodium bicarbonate ingestion and its effects on anaerobic exercise of various durations.

              Four groups of male subjects participated in anaerobic testing on a Repco EX10 cycle ergometer to determine the effectiveness of sodium bicarbonate (0.3 g kg-1 body mass) as an ergogenic aid during exercise of 10, 30, 120 and 240 s duration. Blood was collected 90 min prior to ingestion of sodium bicarbonate (NaHCO3), after ingestion of NaHCO3 and immediately post-exercise from a heated (43-46 degrees C) fingertip and analysed immediately post-collection for pH, base excess, bicarbonate and lactate. The total work undertaken (kJ) and peak power achieved during the tests were also obtained via a Repco Work Monitor Unit. Blood bicarbonate levels were again increased above the control and placebo conditions (P < 0.001) and blood lactate levels were also increased following the bicarbonate trials. The pH levels fell significantly (P < 0.05) below the control and placebo conditions in all trials. The results indicate that NaHCO3 at this dosage has no ergogenic benefit for work of either 10 or 30 s duration, even though blood bicarbonate levels were significantly increased (P < 0.05) following ingestion of NaHCO3. For work periods of 120 and 240 s, performance was significantly increased (P < 0.05) above the control and placebo conditions following NaHCO3 ingestion.
                Bookmark

                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rbme
                Revista Brasileira de Medicina do Esporte
                Rev Bras Med Esporte
                Sociedade Brasileira de Medicina do Exercício e do Esporte (São Paulo )
                1806-9940
                December 2006
                : 12
                : 6
                : 371-375
                Affiliations
                [1 ] Universidade de São Paulo Brazil
                Article
                S1517-86922006000600014
                10.1590/S1517-86922006000600014
                94b37d46-3fe5-461a-b91f-06e199dd7715

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1517-8692&lng=en
                Categories
                PHYSIOLOGY
                SPORT SCIENCES

                Sports medicine,Anatomy & Physiology
                Alcalosis,Martial arts,Alkalosis,Lactate,Fatigue,Artes marciales,Lactato,Fatiga,Artes marciais,Alcalose,Fadiga

                Comments

                Comment on this article