Effect of lactate supplementation and sodium bicarbonate on 40-km cycling time trial performance

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Northgraves, Matthew J ; Peart, Daniel J ; Jordan, Christian A ; Vince, Rebecca V (2014)

The use of nutritional supplements to improve sporting performance and increase training adaptations is commonplace among athletes and is an expanding market in terms of product choice and availability. The purpose of this study was to examine the effects of 2 ergogenic aids with extracellular blood buffering potential, namely sodium bicarbonate (NaHCO3) and a lactate supplement, during a 40-km cycling time trial. Seven recreationally active men (age, 22.3 ± 3.3 years; height, 182.5 ± 6.5 cm; body mass, 79.2 ± 6.3 kg) completed five 40-km cycling time trials, including a familiarization trial in a randomized, blind, double placebo-controlled design. Subjects ingested (a) 300 mg·kg-1 body mass NaHCO3 (BICARB), (b) 45 mg·kg-1 body mass sodium chloride (PL-BICARB) as the placebo for the NaHCO3 trial, (c) 1115 mg lactate (LACTATE), or (d) plain flour as the placebo for the lactate trial (PL-LACTATE) 60 minutes before exercise. There was no significant difference in performance between the 4 conditions (p > 0.05). Although NaHCO3 ingestion induced significant changes in all the acid-base variables (all p < 0.05), no significant change was seen following lactate ingestion (p > 0.05). Subjects in the LACTATE condition did have a significantly higher heart rate (p < 0.05) without experiencing any greater perceived exertion (p > 0.05) than the other 3 conditions. Neither NaHCO3 nor lactate supplementation seem to improve 40-km cycling time trial performance. However, the potential benefits following LACTATE regarding perceived exertion require further research.
  • References (21)
    21 references, page 1 of 3

    Bishop D and Claudius B. Effects of induced metabolic alkalosis on prolonged intermittentsprint performance. Medicine and science in sports and exercise 37: 759-767, 2005.

    Brooks GA. Intra- and extra-cellular lactate shuttles. Medicine and science in sports and exercise 32: 790-799, 2000.

    Bryner RW, Hornsby WG, Chetlin R, Ullrich IH, and Yeater RA. Effect of lactate consumption on exercise performance. J Sports Med Phys Fitness 38: 116-123, 1998.

    Cairns SP. Lactic acid and exercise performance : culprit or friend? Sports medicine (Auckland, NZ) 36: 279-291, 2006.

    Cameron SL, McLay-Cooke RT, Brown RC, Gray AR, and Fairbairn KA. Increased blood pH but not performance with sodium bicarbonate supplementation in elite rugby union players. Int J Sport Nutr Exerc Metab 20: 307-321, 2010.

    Carr AJ, Slater GJ, Gore CJ, Dawson B, and Burke LM. Effect of sodium bicarbonate on [HCO3- ], pH, and gastrointestinal symptoms. Int J Sport Nutr Exerc Metab 21: 189-194, 2011.

    Chin ER and Allen DG. The contribution of pH-dependent mechanisms to fatigue at different intensities in mammalian single muscle fibres. The Journal of physiology 512 ( Pt 3): 831-840, 1998.

    Douroudos, II, Fatouros IG, Gourgoulis V, Jamurtas AZ, Tsitsios T, Hatzinikolaou A, Margonis K, Mavromatidis K, and Taxildaris K. Dose-related effects of prolonged NaHCO3 ingestion during high-intensity exercise. Medicine and science in sports and exercise 38: 1746-1753, 2006.

    Drust B, Waterhouse J, Atkinson G, Edwards B, and Reilly T. Circadian rhythms in sports performance--an update. Chronobiol Int 22: 21-44, 2005.

    Fahey TD, Larsen JD, Brooks GA, Colvin W, Henderson S, and Lary D. The effects of ingesting polylactate or glucose polymer drinks during prolonged exercise. Int J Sport Nutr 1: 249-256, 1991.

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