Effects of chronic bicarbonate ingestion on the performance of high-intensity work

Abstract

We have evaluated whether sodium bicarbonate, taken chronically (0.5 g x kg(-1) body mass) for a period of 5 days would improve the performance of eight subjects during 60 s of high-intensity exercise on an electrically braked cycle ergometer. The first test was performed prior to chronic supplementation (pre-ingestion) while the post-ingestion test took place 6 days later. A control test took place approximately 1 month after the cessation of all testing. Acid-base and metabolite data (n = 7) were measured from arterialised blood both pre- and post-exercise, as well as daily throughout the exercise period. The work completed by the subjects in the control and pre-ingestion test [21.1 (0.9) and 21.1 (0.9) MJ, respectively] was less than (P<0.05) that completed in the post-ingestion test [24.1 (0.9) MJ; F(2,21) = 3.4, P<0.05, power = 0.57]. Peak power was higher after the 5-day supplementation period (P<0.05). Ingestion of the sodium bicarbonate for a period of 5 days resulted in an increase in pH (F(5,36) = 12.5, P<0.0001, power = 1.0) over the 5-day period. The blood bicarbonate levels also rose during the trial (P<0.05) from a resting level of 22.8 (0.4) to 28.4 (1.1) mmol x l(-1) after 24 h of ingestion. In conclusion, the addition of sodium bicarbonate to a normal diet proved to be of ergogenic benefit in the performance of short-term, high-intensity work.

Distance-dependent Association of Affect with Pacing Strategy in Cycling Time Trials

“…An average value was calculated to produce an overall self-efficacy score. Fingertip capillary blood lactate (BLa; Analox Micro-Stat, P-GM7, USA) and blood acid-base status (pH, pO2, pCO2, ctHb, sO2, cBase, cHCO3 -; Radiometer, ABL800, Copenhagen, Denmark) were analysed prior to each trial and the participants' hand was warmed prior to sampling to ensure an accurate reflection of an arterialised capillary sample (27).…”

Influence of exercise on nutritional requirements

“…Studies have shown that 0.3 g/kg bicarbonate and 0.3-0.5 g/kg citrate taken orally with 1-2 L of water 60-90 min pre-exercise increases the pH in the extracellular space (McNaughton 2000). Higher doses spread over a day or so may have prolonged effects, including improved training duration (McNaughton et al 1999). These changes have shown performance enhancement in high intensity exercise (either 1-7 min continuous or 30-60 min intermittently) (Burke 2007).…”

Efeitos da suplementação crônica de lactato de cálcio e bicarbonato de sódio sobre desempenho físico em exercício intermitente de alta intensidade

“…Contudo, apenas um estudo apresentou resultados positivos, com uma grande melhora de 25% no desempenho aeróbio (AZEVEDO et al, 2007). No entanto, como há aumento dos níveis de pH (FAHEY et al, 1991;MORRIS, et al, 2011;PAINELLI et al, 2014) e bicarbonato (FAHEY et al, 1991;PAINELLI et al, 2014) (MCNAUGHTON, et al, 1999), pois pode promover um incremento maior no bicarbonato sanguíneo com o maior período de suplementação, mas esse protocolo ainda precisa ser explorado. Os dados estão apresentados como média ± desvio-padrão.…”